CN110201657B - Dipping method for gasoline vehicle particle catcher - Google Patents
Dipping method for gasoline vehicle particle catcher Download PDFInfo
- Publication number
- CN110201657B CN110201657B CN201910552384.0A CN201910552384A CN110201657B CN 110201657 B CN110201657 B CN 110201657B CN 201910552384 A CN201910552384 A CN 201910552384A CN 110201657 B CN110201657 B CN 110201657B
- Authority
- CN
- China
- Prior art keywords
- gasoline car
- catcher
- particle catcher
- aluminum
- dipping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002245 particle Substances 0.000 title claims abstract description 133
- 238000007598 dipping method Methods 0.000 title claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 64
- 239000011248 coating agent Substances 0.000 claims abstract description 50
- 238000000576 coating method Methods 0.000 claims abstract description 50
- 239000006185 dispersion Substances 0.000 claims abstract description 46
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 34
- 230000003197 catalytic effect Effects 0.000 claims abstract description 34
- 238000007654 immersion Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000008367 deionised water Substances 0.000 claims abstract description 8
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 8
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 8
- 239000006254 rheological additive Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 28
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 238000009423 ventilation Methods 0.000 claims description 9
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 6
- 239000011975 tartaric acid Substances 0.000 claims description 6
- 235000002906 tartaric acid Nutrition 0.000 claims description 6
- 229920002907 Guar gum Polymers 0.000 claims description 5
- 235000010417 guar gum Nutrition 0.000 claims description 5
- 239000000665 guar gum Substances 0.000 claims description 5
- 229960002154 guar gum Drugs 0.000 claims description 5
- 229910000505 Al2TiO5 Inorganic materials 0.000 claims description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 4
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 4
- 229910001679 gibbsite Inorganic materials 0.000 claims description 4
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 claims description 4
- 108010010803 Gelatin Proteins 0.000 claims description 3
- 229910001593 boehmite Inorganic materials 0.000 claims description 3
- 229920000159 gelatin Polymers 0.000 claims description 3
- 239000008273 gelatin Substances 0.000 claims description 3
- 235000019322 gelatine Nutrition 0.000 claims description 3
- 235000011852 gelatine desserts Nutrition 0.000 claims description 3
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 235000010493 xanthan gum Nutrition 0.000 claims description 3
- 229920001285 xanthan gum Polymers 0.000 claims description 3
- 239000000230 xanthan gum Substances 0.000 claims description 3
- 229940082509 xanthan gum Drugs 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 229940014259 gelatin Drugs 0.000 claims description 2
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 22
- 239000011148 porous material Substances 0.000 description 18
- 238000012360 testing method Methods 0.000 description 14
- 238000005470 impregnation Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 229910052878 cordierite Inorganic materials 0.000 description 6
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 6
- 238000003618 dip coating Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/12—Silica and alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0203—Impregnation the impregnation liquid containing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0213—Preparation of the impregnating solution
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The invention relates to a dipping method of a gasoline car particle catcher, which comprises the following steps: dispersing an aluminum source in deionized water, adding nitric acid to adjust the pH value of the solution, and heating the solution in a water bath to obtain aluminum sol; adding the ash content simulation particles into the alumina sol to form a dispersion liquid; adding a dispersing auxiliary agent into the dispersion liquid, and placing the dispersion liquid into a water bath kettle; adding a rheology modifier to the dispersion; vertically immersing the gasoline car particle catcher coated with the catalytic coating downwards into immersion liquid, wherein the immersion height is 50-100% of the height of the catcher, and taking out the catcher and rotating 180 degrees after immersion; drying the catcher, fixing the catcher on the dipping end face by using an air seal, and blowing high-temperature airflow into the catcher from the end face; and (4) placing the catcher in a muffle furnace for roasting. The invention can obviously improve the PN trapping rate of the gasoline vehicle particle trap and can not bring about great increase of back pressure.
Description
Technical Field
The invention relates to a dipping method of a gasoline car particle catcher, belonging to the technical field of tail gas aftertreatment.
Background
Gasoline car particulate trap catalyst (GPF) is a commonly used after-treatment device in the VI emission stage of gasoline car countries. The GPF structure is wall flow type cordierite honeycomb ceramic, the end surface is provided with open pores and closed pore channels which are adjacent in sequence and carryThe walls of the body channels are microporous to allow airflow therethrough. The tail gas of the gasoline engine flows into the carrier pore channels through the pore channels with the holes on the end faces of the GPF, and then flows out from the adjacent pore channels through the walls of the carrier pore channels. In the process that the tail gas passes through the carrier pore channel wall, the wrapped particulate matters are intercepted by the carrier pore channel wall, and the particle filtering effect is further achieved. In order to ensure that the quantity (PN) of the filtered tail gas particles can meet the requirements of national VI regulations (less than or equal to 6.0 multiplied by 10)11One/km), a catalytic coating is usually required to be coated on the GPF, and the coating can play a role in assisting in intercepting particulate matters, so that the PN trapping effect is enhanced to enable the PN trapping effect to meet the emission requirement, but the increase of the coating can bring about the increase of the exhaust back pressure of the GPF, and then the fuel economy of an engine is reduced. Therefore, balancing the PN trapping effect with the backpressure is a difficulty in GPF design.
During the operation of the gasoline engine, ash substances are generated due to the consumption of engine oil and deposited on the GPF, and the adhesion of the ash substances can improve the PN trapping effect of the GPF. The national VI code for light-duty vehicles also states that the test vehicle should be run in for 3000km before the emission test is performed, and that the ash accumulated after the run-in is also helpful for PN emissions to meet the national VI requirements, without the ash causing a significant increase in back pressure. However, in the process of after-treatment development of gasoline vehicles, 3000km running-in cannot be carried out before each GPF scheme is tested, and PN emission can be exceeded due to direct test of fresh GPFs. The current solution is to increase the loading of the GPF catalytic coating, which directly leads to an increase in exhaust backpressure. Therefore, finding a method capable of simulating a running-in state to realize efficient increase of PN trapping without causing significant increase of back pressure is an important research direction in the design process of GPF.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a dipping method for a gasoline car particle catcher, which can obviously improve the PN trapping rate of the gasoline car particle catcher and can not bring about the great increase of back pressure.
According to the technical scheme provided by the invention, the dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing an aluminum source into deionized water according to the aluminum content of 1-15%, adding nitric acid to control the pH of the solution to be 1-3, heating the solution in a water bath at 40-60 ℃ for 3-6 h, and stirring at the rotating speed of 50-100 rpm by a stirrer while heating to obtain alumina sol;
b. adding the ash content simulation particles into the aluminum sol obtained in the step a, wherein the adding mass of the ash content simulation particles is 1-10% of the mass of aluminum in the sol, and then stirring the mixture for 1-4 h at 100-300 rpm by a stirrer to fully disperse the ash content simulation particles to form a dispersion liquid;
c. b, adding a dispersing auxiliary agent into the dispersion liquid obtained in the step b, wherein the adding amount of the dispersing auxiliary agent is 1% -10% of the mass of aluminum in the dispersion liquid, then placing the dispersion liquid into a water bath kettle, heating in a water bath at 60-80 ℃ for 2-4 h, and stirring by a stirrer at the rotating speed of 100-200 rpm in the heating process;
d. c, adding a rheological regulator which accounts for 0.1-0.5% of the mass of the solidified substance of the dispersion liquid into the dispersion liquid prepared in the step c, and stirring at the rotating speed of 100-200 rpm for 8-12 h to prepare dipping liquid of the gasoline car particle catcher;
e. weighing the gasoline car particle catcher coated with the catalytic coating, then vertically immersing one end face of the gasoline car particle catcher into the immersion liquid prepared in the step d, controlling the immersion time to be 30-300 s, and enabling the immersion height to be 50% -100% of the height of the gasoline car particle catcher, taking out the gasoline car particle catcher after the immersion process is finished, rotating the gasoline car particle catcher by 180 degrees to enable the gasoline car particle catcher to be inverted, and throwing redundant immersion liquid out from the lower part of the gasoline car particle catcher;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in a 60-80 ℃ drying oven to be dried for 1-2 hours, then raising the temperature of the drying oven to 120-160 ℃ and keeping the temperature for 0.5-1 hour, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 120-180 ℃ airflow into the catcher from the end face at the speed of 5-10 m/s, controlling the ventilation time to be 5-20 min, weighing and calculating the coating amount after the completion;
g. and e, repeating the operation of the step e and the operation of the step f until the coating amount of the dipping solution is 2-4 g/L, then placing the gasoline car particle catcher in a muffle furnace, and roasting for 2-4 h at 500-650 ℃ to finish the dipping of the gasoline car particle catcher.
The aluminum source in the step a is pseudo-boehmite, boehmite or gibbsite.
And the ash content simulation particulate matters in the step b are one or more of aluminum silicate, aluminum titanate, calcium sulfate, barium sulfate, silicon dioxide and aluminum oxide. The median particle size of ash content simulation particulate matter is at 5~15 um, and volume average particle size is at 8~15 um.
The dispersing aid in the step c is acetic acid, citric acid or tartaric acid.
The rheology modifier in the step d is gelatin, guar gum or xanthan gum.
The impregnation liquid is coated on the gasoline car particle catcher, so that the ash content simulation particles are uniformly distributed on the catcher, and the effect of simulating ash content accumulation is achieved. The uniformly dispersed ash content simulation particulate matter can effectively improve the PN trapping efficiency of the gasoline car particle trap, does not obviously increase exhaust back pressure, and effectively solves the problem that the PN trapping efficiency of the fresh gasoline car particle trap is relatively low. .
Drawings
Figure 1 is a graph of the increase contribution of catalytic coating and impregnation to backpressure and PN trapping efficiency.
Fig. 2 is a graph comparing the results of the catalytic performance of the benches of example 4 and comparative example 4.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
the wall flow type cordierite honeycomb ceramic carrier with the specification of phi 118.4mm 127mm, the mesh number of 300 meshes, the wall thickness of a pore channel of 203.2 mu m, the porosity of 65 percent, the average pore diameter of 20 mu m and the volume of 1.398L is selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 60 g/L.
The dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing pseudo-boehmite in deionized water according to the aluminum content of 1%, then adding nitric acid to control the pH value to be 1, heating the solution in a water bath at 40 ℃ for 3h, and stirring at the rotating speed of 50rpm by a stirrer while heating to obtain alumina sol;
b. adding aluminum silicate particles (the median particle diameter is 15um, the volume average particle diameter is 15um) into the aluminum sol obtained in the step a, wherein the adding mass of the aluminum silicate particles is 1 percent of the mass of aluminum in the sol, and then stirring the system for 1 hour at 100rpm by a stirrer to fully disperse the particles to form a dispersion liquid;
c. and c, adding acetic acid into the dispersion liquid obtained in the step b, wherein the adding amount of the acetic acid is 1 percent of the mass of the aluminum in the dispersion liquid. Then placing the dispersion liquid in a water bath kettle, heating in water bath at 60 ℃ for 2h, and stirring by a stirrer at the rotating speed of 100rpm in the heating process;
d. adding gelatin with the mass of 0.1 percent of that of the solidified dispersion into the dispersion prepared in the step c, and then stirring at the rotating speed of 100rpm for 8 hours to prepare dipping liquid of the gasoline car particle catcher;
e. and (d) weighing the gasoline car particle catcher, then vertically immersing the gasoline car particle catcher into the immersion liquid prepared in the step d with one end face downward, wherein the immersion time is controlled to be 30s, and the immersion height is 50%. After the dipping process is finished, taking out the gasoline car particle catcher, vertically inverting the gasoline car particle catcher at 180 degrees, and throwing redundant dipping liquid out from the lower part;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in a 60 ℃ oven to be dried for 1h, then raising the temperature of the oven to 120 ℃ and keeping the temperature for 0.5h, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 120 ℃ airflow into the catcher from the end face at the speed of 5m/s, controlling the ventilation time to be 5min, weighing and calculating the coating amount after the ventilation is finished;
g. and e, repeating the operations of the steps e and f until the coating amount of the impregnating solution reaches 2g/L, then placing the gasoline car particle catcher into a muffle furnace, and roasting for 2 hours at 500 ℃ to finish the impregnation of the gasoline car particle catcher.
Example 2:
the wall flow type cordierite honeycomb ceramic carrier with the specification of phi 118.4mm 127mm, the mesh number of 300 meshes, the wall thickness of a pore channel of 203.2 mu m, the porosity of 65 percent, the average pore diameter of 20 mu m and the volume of 1.398L is selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 80 g/L.
The dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing boehmite in deionized water according to the aluminum content of 5%, then adding nitric acid to control the pH value to be 2, heating the solution in a water bath at 50 ℃ for 4h, and stirring at the rotating speed of 60rpm by a stirrer while heating to obtain alumina sol;
b. adding aluminum titanate particles (the median particle diameter is 10um, the volume average particle diameter is 10um) into the aluminum sol obtained in the step a, wherein the adding mass of the aluminum titanate particles is 3% of the mass of aluminum in the sol, and then stirring the system for 2 hours at 200rpm by a stirrer to fully disperse the particles to form a dispersion liquid;
c. and c, adding citric acid into the dispersion liquid obtained in the step b, wherein the adding amount of the citric acid is 3% of the mass of aluminum in the dispersion liquid. Then placing the dispersion liquid in a water bath kettle, heating in 70 ℃ water bath for 3h, and stirring by a stirrer at the rotating speed of 150rpm in the heating process;
d. c, adding guar gum accounting for 0.2 percent of the mass of the solidified substance of the dispersion into the dispersion prepared in the step c, and stirring at the rotating speed of 150rpm for 10 hours to prepare dipping liquid of the gasoline car particle catcher;
e. and (d) weighing the gasoline car particle catcher, then vertically immersing the gasoline car particle catcher into the immersion liquid prepared in the step d with one end face downward, wherein the immersion time is controlled to be 160s, and the immersion height is 60%. After the dipping process is finished, taking out the gasoline car particle catcher, vertically inverting the gasoline car particle catcher at 180 degrees, and throwing redundant dipping liquid out from the lower part;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in a 70 ℃ drying oven for drying for 1.5h, then raising the temperature of the drying oven to 140 ℃ and keeping the temperature for 0.6h, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 150 ℃ airflow into the catcher from the end face at the speed of 6m/s, controlling the ventilation time to be 10min, weighing and calculating the coating amount after the ventilation is finished;
g. and e, repeating the operations of the steps e and f until the coating amount of the impregnating solution reaches 2g/L, then placing the gasoline car particle catcher into a muffle furnace, and roasting at 550 ℃ for 3h to finish the impregnation of the gasoline car particle catcher.
Example 3:
the wall flow type cordierite honeycomb ceramic carrier with the specification of phi 118.4mm 127mm, the mesh number of 300 meshes, the wall thickness of a pore channel of 203.2 mu m, the porosity of 65 percent, the average pore diameter of 20 mu m and the volume of 1.398L is selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 100 g/L.
The dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing gibbsite in deionized water according to the aluminum content of 10%, then adding nitric acid to control the pH value to be 3, heating the solution in a water bath at 60 ℃ for 6h, and stirring the solution at the rotating speed of 80rpm by a stirrer while heating to obtain alumina sol;
b. adding calcium sulfate particles (the median particle size is 5um, and the volume average particle size is 8um) into the aluminum sol obtained in the step a, wherein the adding mass of the calcium sulfate particles is 5% of the mass of aluminum in the sol, and then stirring the system for 4 hours at 300rpm by a stirrer to fully disperse the particles to form a dispersion liquid;
c. and c, adding tartaric acid into the dispersion liquid obtained in the step b, wherein the adding amount of the tartaric acid is 5% of the mass of aluminum in the dispersion liquid. Then placing the dispersion liquid in a water bath kettle, heating in 80 ℃ water bath for 4h, and stirring by a stirrer at the rotating speed of 200rpm in the heating process;
d. c, adding xanthan gum accounting for 0.3 percent of the mass of the solidified substance of the dispersion liquid into the dispersion liquid prepared in the step c, and stirring at the rotating speed of 200rpm for 12 hours to prepare dipping liquid of the gasoline car particle catcher;
e. and (d) weighing the gasoline car particle catcher, then vertically immersing the gasoline car particle catcher into the immersion liquid prepared in the step d with one end face downward, wherein the immersion time is controlled to be 250s, and the immersion height is 80%. After the dipping process is finished, taking out the gasoline car particle catcher, vertically inverting the gasoline car particle catcher at 180 degrees, and throwing redundant dipping liquid out from the lower part;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in an oven at 80 ℃ for drying for 2 hours, then raising the temperature of the oven to 160 ℃ and keeping the temperature for 0.8 hour, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 160 ℃ airflow into the catcher from the end face at the speed of 8m/s, controlling the ventilation time to be 15min, weighing and calculating the coating amount;
g. and e, repeating the operations of the steps e and f until the coating amount of the impregnating solution reaches 2g/L, then placing the gasoline car particle catcher into a muffle furnace, and roasting for 4 hours at 600 ℃ to finish the impregnation of the gasoline car particle catcher.
Example 4:
the wall flow type cordierite honeycomb ceramic carrier with the specification of phi 118.4mm 127mm, the mesh number of 300 meshes, the wall thickness of a pore channel of 203.2 mu m, the porosity of 65 percent, the average pore diameter of 20 mu m and the volume of 1.398L is selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 100 g/L.
The dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing pseudo-boehmite in deionized water according to the aluminum content of 10%, then adding nitric acid to control the pH value to be 3, heating the solution in a water bath at 60 ℃ for 6h, and stirring the solution at the rotating speed of 100rpm by a stirrer while heating to obtain alumina sol;
b. b, adding barium sulfate particles (the median particle size is 10um, and the volume average particle size is 10um) into the aluminum sol obtained in the step a, wherein the adding mass of the barium sulfate particles is 8% of the mass of aluminum in the sol, and then stirring the system for 4 hours at 300rpm by a stirrer to fully disperse the particles to form a dispersion liquid;
c. and c, adding tartaric acid into the dispersion liquid obtained in the step b, wherein the adding amount of the tartaric acid is 8% of the mass of aluminum in the dispersion liquid. Then placing the dispersion liquid in a water bath kettle, heating in 80 ℃ water bath for 4h, and stirring by a stirrer at the rotating speed of 200rpm in the heating process;
d. c, adding guar gum accounting for 0.3 percent of the mass of the solidified substance of the dispersion into the dispersion prepared in the step c, and stirring at the rotating speed of 200rpm for 12 hours to prepare dipping liquid of the gasoline car particle catcher;
e. and (d) weighing the gasoline car particle catcher, then vertically immersing the gasoline car particle catcher into the immersion liquid prepared in the step d with one end face downward, wherein the immersion time is controlled to be 300s, and the immersion height is 90%. After the dipping process is finished, taking out the gasoline car particle catcher, vertically inverting the gasoline car particle catcher at 180 degrees, and throwing redundant dipping liquid out from the lower part;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in an oven at 80 ℃ for drying for 2 hours, then raising the temperature of the oven to 160 ℃ and keeping the temperature for 1 hour, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 180 ℃ airflow into the catcher from the end face at the speed of 10m/s, controlling the ventilation time to be 15min, weighing and calculating the coating amount;
g. and e, repeating the operations of the steps e and f until the coating amount of the impregnating solution reaches 4g/L, then placing the gasoline car particle catcher into a muffle furnace, and roasting for 4 hours at 600 ℃ to finish the impregnation of the gasoline car particle catcher.
Example 5:
the wall flow type cordierite honeycomb ceramic carrier with the specification of phi 118.4mm 127mm, the mesh number of 300 meshes, the wall thickness of a pore channel of 203.2 mu m, the porosity of 65 percent, the average pore diameter of 20 mu m and the volume of 1.398L is selected. The carrier is coated with a catalytic coating, and the coating amount of the catalytic coating is 120 g/L.
The dipping method of the gasoline car particle catcher comprises the following steps:
a. dispersing gibbsite into deionized water according to the aluminum content of 15%, then adding nitric acid to control the pH value to be 3, heating the solution in water bath at 60 ℃ for 6h, and stirring by a stirrer at the rotating speed of 100rpm to obtain alumina sol while heating;
b. mixing silicon dioxide and aluminum oxide particles (the median particle diameter is 10um, the volume average particle diameter is 10um) according to the mass ratio of 1:1, adding the mixture into the aluminum sol obtained in the step a, wherein the adding mass of the mixed particles is 10% of the mass of aluminum in the sol, and then stirring the system for 4 hours at 300rpm by a stirrer to fully disperse the particles to form a dispersion liquid;
c. and c, adding citric acid into the dispersion liquid obtained in the step b, wherein the adding amount of the citric acid is 10% of the mass of the aluminum in the dispersion liquid. Then placing the dispersion liquid in a water bath kettle, heating in 80 ℃ water bath for 4h, and stirring by a stirrer at the rotating speed of 200rpm in the heating process;
d. c, adding guar gum accounting for 0.5 percent of the mass of the solidified substance of the dispersion into the dispersion prepared in the step c, and stirring at the rotating speed of 200rpm for 12 hours to prepare dipping liquid of the gasoline car particle catcher;
e. and (d) weighing the gasoline car particle catcher, then vertically immersing the gasoline car particle catcher into the immersion liquid prepared in the step d with one end face downward, wherein the immersion time is controlled to be 300s, and the immersion height is 100%. After the dipping process is finished, taking out the gasoline car particle catcher, vertically inverting the gasoline car particle catcher at 180 degrees, and throwing redundant dipping liquid out from the lower part;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in an oven at 80 ℃ for drying for 2 hours, then raising the temperature of the oven to 160 ℃ and keeping the temperature for 1 hour, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 180 ℃ airflow into the catcher from the end face at the speed of 10m/s, controlling the ventilation time to be 20min, weighing and calculating the coating amount;
g. and e, repeating the operations of the steps e and f until the coating amount of the impregnating solution reaches 2g/L, then placing the gasoline car particle catcher into a muffle furnace, and roasting at 650 ℃ for 4 hours to finish the impregnation of the gasoline car particle catcher.
Comparative example 1:
the support specifications and catalytic coating application of this comparative example were the same as example 1 except that the gasoline car particulate trap dip-coating was not performed.
Comparative example 2:
the support specifications and catalytic coating application of this comparative example were the same as example 2 except that the gasoline car particulate trap dip-coating was not performed.
Comparative example 3:
the support specifications and catalytic coating application of this comparative example were the same as example 3, except that the gasoline car particulate trap dip-coating was not performed.
Comparative example 4:
the support specifications and catalytic coating application of this comparative example were the same as example 4 except that the gasoline car particulate trap dip-coating was not performed.
Comparative example 5:
the support specifications and catalytic coating application of this comparative example were the same as example 5 except that the gasoline car particulate trap dip-coating was not performed.
Testing exhaust back pressure:
the particle traps prepared in each example and comparative example were respectively mounted on a cold flow backpressure tester for cold flow exhaust backpressure test. The backpressure test condition is that the air flow is 600m3H; temperature: at 25 ℃. The test results are shown in Table 1.
WLTC emissions test:
the particle traps prepared in the examples and the comparative examples are respectively installed in exhaust pipes of test vehicles, the PN trapping efficiency test of the whole vehicle is carried out according to the WLTC cycle specified in GB18352.6-2016, and the discharge capacity of the test vehicles is 1.4T GDI. The test results are shown in Table 1.
Testing the catalytic performance of the bench:
the particulate traps prepared in example 4 and comparative example 4 were respectively mounted on a gasoline engine stand, and CO, HC, and NO were performed as specified by HJ/T331-2006xThe light-off temperature of (1). The test results are shown in FIG. 2.
TABLE 1
| Cold flow backpressure (kPa) | PN trapping efficiency | |
| Comparative example 1 | 5.50 | 56.70％ |
| Example 1 | 5.57 | 63.50％ |
| Comparative example 2 | 5.81 | 65.20％ |
| Example 2 | 5.89 | 71.10％ |
| Comparative example 3 | 6.08 | 73.30％ |
| Example 3 | 6.16 | 80.60％ |
| Comparative example 4 | 6.09 | 73.40％ |
| Example 4 | 6.26 | 86.30％ |
| Comparative example 5 | 6.37 | 80.10％ |
| Example 5 | 6.42 | 87.70％ |
As can be seen from table 1, each example showed a small increase in cold flow back pressure, but the PN trapping efficiency was improved more significantly than the corresponding comparative example after the application of the dip coating. In order to quantitatively determine the influence relationship of the immersion fluid and the catalytic coating on the increase of the cold flow back pressure and the PN trapping efficiency, we calculated the increase contributions of the catalytic coating and the immersion fluid to the back pressure and the PN trapping efficiency respectively at 1g/L, and the results are shown in fig. 1.
As can be seen from FIG. 1, when the coating amounts are each 1g/L, the catalytic coating layer and the immersion liquid contribute to the back pressure of 0.014 and 0.036kPa, respectively, the latter being about 2.5 times as much as the former; the contributions to the increase in PN trapping rate were 0.37% and 3.41%, respectively, with the latter being about 9.2 times the former. Therefore, the impregnation liquid is obviously helpful to increase the PN trapping rate of the gasoline car particle catcher, and the influence on the back pressure increase is relatively very small. However, since the catalytic coating of the gasoline car particulate trap bears the additional role of the front TWC to remove gaseous pollutants CO, HC and NO in addition to trapping particulatesxTo clarify the effect of the impregnation solution application on the catalytic performance of the catalytic coating with respect to gaseous pollutants, we performed a bench-based catalytic performance test for example 4 and comparative example 4, and the results are shown in fig. 2.
As can be seen from FIG. 2, example 4 was coated with 4g/L of the impregnating solution, and then treated with CO, HC and NOxThe light-off temperature of (A) was almost the same as that of comparative example 4, the difference<At 0.5 ℃, the surface of the impregnation liquid provided by the invention has almost no negative influence on the catalytic performance of the catalytic coating.
The gasoline car particle catcher impregnation liquid provided by the invention is matched with the catalytic coating for use, so that the use amount and the overall back pressure of the catalytic coating can be effectively reduced, the PN catching rate can be improved, and the problem that the PN catching efficiency of a fresh gasoline car particle catcher is relatively low is solved.
Claims (5)
1. The dipping method of the gasoline car particle catcher is characterized by comprising the following steps:
a. dispersing an aluminum source into deionized water according to the aluminum content of 1-15%, adding nitric acid to control the pH of the solution to be 1-3, heating the solution in a water bath at 40-60 ℃ for 3-6 h, and stirring at the rotating speed of 50-100 rpm by a stirrer while heating to obtain alumina sol;
b. adding ash content simulation particles into the aluminum sol obtained in the step a, wherein the adding mass of the ash content simulation particles is 1-10% of the mass of aluminum in the sol, and then stirring the mixture for 1-4 h at 100-300 rpm by a stirrer to fully disperse the ash content simulation particles to form a dispersion liquid, wherein the ash content simulation particles are one or more of aluminum silicate, aluminum titanate, calcium sulfate, barium sulfate, silicon dioxide and aluminum oxide;
c. b, adding a dispersing aid into the dispersion liquid obtained in the step b, wherein the adding amount of the dispersing aid is 1-10% of the mass of aluminum in the dispersion liquid, then placing the dispersion liquid into a water bath kettle, heating in a water bath at 60-80 ℃ for 2-4 h, and stirring at a rotating speed of 100-200 rpm by a stirrer in the heating process;
d. c, adding a rheological regulator which accounts for 0.1-0.5% of the mass of a solidified substance of the dispersion liquid into the dispersion liquid prepared in the step c, and stirring at the rotating speed of 100-200 rpm for 8-12 hours to prepare dipping liquid of the gasoline car particle catcher;
e. weighing the gasoline car particle catcher coated with the catalytic coating, then vertically immersing one end face of the gasoline car particle catcher into the immersion liquid prepared in the step d, controlling the immersion time to be 30-300 s, and controlling the immersion height to be 50% -100% of the height of the gasoline car particle catcher, taking out the gasoline car particle catcher after the immersion process is finished, rotating the gasoline car particle catcher by 180 degrees to invert the gasoline car particle catcher, and throwing redundant immersion liquid out of the lower part of the gasoline car particle catcher;
f. after the dipping is finished, horizontally placing the gasoline car particle catcher in a 60-80 ℃ drying oven to be dried for 1-2 hours, then raising the temperature of the drying oven to 120-160 ℃ and keeping the temperature for 0.5-1 hour, finally fixing the dipping end face of the gasoline car particle catcher in the step e by using an air seal, blowing 120-180 ℃ airflow into the catcher from the end face at the speed of 5-10 m/s, controlling the ventilation time to be 5-20 min, weighing and calculating the coating amount after the completion;
g. and e, repeating the operation of the step e and the operation of the step f until the coating amount of the dipping solution is 2-4 g/L, then placing the gasoline car particle catcher in a muffle furnace, and roasting for 2-4 h at 500-650 ℃ to finish the dipping of the gasoline car particle catcher.
2. The method for impregnating the gasoline car particulate trap as set forth in claim 1, wherein: the aluminum source in the step a is pseudo-boehmite, boehmite or gibbsite.
3. The method for impregnating the gasoline car particulate trap as set forth in claim 1, wherein: the median particle size of the ash content simulation particles is 5-15 mu m, and the volume average particle size is 8-15 mu m.
4. The method for impregnating the gasoline car particulate trap as set forth in claim 1, wherein: the dispersing aid in the step c is acetic acid, citric acid or tartaric acid.
5. The method for impregnating the gasoline car particulate trap as set forth in claim 1, wherein: the rheology modifier in the step d is gelatin, guar gum or xanthan gum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552384.0A CN110201657B (en) | 2019-06-25 | 2019-06-25 | Dipping method for gasoline vehicle particle catcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910552384.0A CN110201657B (en) | 2019-06-25 | 2019-06-25 | Dipping method for gasoline vehicle particle catcher |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110201657A CN110201657A (en) | 2019-09-06 |
| CN110201657B true CN110201657B (en) | 2022-02-08 |
Family
ID=67794376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910552384.0A Active CN110201657B (en) | 2019-06-25 | 2019-06-25 | Dipping method for gasoline vehicle particle catcher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110201657B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110761873B (en) * | 2019-11-26 | 2024-08-02 | 广西玉柴机器股份有限公司 | Reduce diesel engine tail gas particle number emission device |
| CN116608033A (en) * | 2023-06-20 | 2023-08-18 | 中国第一汽车股份有限公司 | Method and device for treating catalyst of particle catcher of gasoline car |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206287A (en) * | 2011-11-29 | 2013-07-17 | 迪尔公司 | Diesel Particulate Filters Having A Washcoat That Improves Filter Performance |
| CN106246298A (en) * | 2015-06-15 | 2016-12-21 | 福特环球技术公司 | For reducing the system and method for particulate emissions |
| CN107362950A (en) * | 2017-07-11 | 2017-11-21 | 中国第汽车股份有限公司 | A kind of wall-flow particulate filter carrier painting method using organosol |
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN108295851A (en) * | 2018-01-25 | 2018-07-20 | 无锡威孚环保催化剂有限公司 | Gasoline car grain catcher catalyst and preparation method thereof |
| CN109100154A (en) * | 2018-07-05 | 2018-12-28 | 无锡威孚环保催化剂有限公司 | A kind of quick ash content collecting apparatus of gasoline engine grain catcher and its application method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010120623A1 (en) * | 2009-04-16 | 2010-10-21 | Massachusetts Institute Of Technology | Method for reducing pressure drop through filters, and filter exhibiting reduced pressure drop |
-
2019
- 2019-06-25 CN CN201910552384.0A patent/CN110201657B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103206287A (en) * | 2011-11-29 | 2013-07-17 | 迪尔公司 | Diesel Particulate Filters Having A Washcoat That Improves Filter Performance |
| CN106246298A (en) * | 2015-06-15 | 2016-12-21 | 福特环球技术公司 | For reducing the system and method for particulate emissions |
| CN107362950A (en) * | 2017-07-11 | 2017-11-21 | 中国第汽车股份有限公司 | A kind of wall-flow particulate filter carrier painting method using organosol |
| CN107715875A (en) * | 2017-11-01 | 2018-02-23 | 台州欧信环保净化器有限公司 | A kind of GPF four-way catalysts and preparation method thereof |
| CN108295851A (en) * | 2018-01-25 | 2018-07-20 | 无锡威孚环保催化剂有限公司 | Gasoline car grain catcher catalyst and preparation method thereof |
| CN109100154A (en) * | 2018-07-05 | 2018-12-28 | 无锡威孚环保催化剂有限公司 | A kind of quick ash content collecting apparatus of gasoline engine grain catcher and its application method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110201657A (en) | 2019-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108295851B (en) | Catalyst for gasoline vehicle particle catcher and preparation method thereof | |
| CN109621952B (en) | Catalyst for gasoline engine tail gas particulate matter filter and preparation method thereof | |
| CN108979798B (en) | Gasoline vehicle particle trapping catalyst and preparation method thereof | |
| CN102781586B (en) | Method of coating a monolith substrate with catalyst component | |
| CN108404975B (en) | Oxidation type catalytic system with good low-temperature ignition performance and preparation process thereof | |
| EP2105199B1 (en) | Catalyst-carrying filter | |
| CN110201657B (en) | Dipping method for gasoline vehicle particle catcher | |
| US12264106B2 (en) | Cerium-zirconium-aluminum-based composite material, cGPF catalyst and preparation method therefor | |
| CN109590014B (en) | Integral diesel vehicle tail gas oxidation catalyst and preparation method thereof | |
| CN104895652B (en) | Reduce the granular material discharged catalyzed diesel particulate filter of diesel vehicle and preparation method | |
| CN109647088B (en) | Preparation method of diesel particulate filter with low back pressure and high carbon smoke filtering efficiency | |
| CN112675901A (en) | SCR catalyst for diesel engine tail gas treatment and preparation method and application thereof | |
| CN114534776A (en) | Sulfur-resistant diesel vehicle oxidation type catalyst and preparation method thereof | |
| CN115555039B (en) | Non-noble metal DPF catalyst with good sulfur resistance and preparation method thereof | |
| CN111997718B (en) | Post-processing method applied to diesel-natural gas dual-fuel vehicle | |
| US12092008B2 (en) | Exhaust purification filter | |
| CN112517003B (en) | Catalyst for particle catcher of gasoline car and preparation method thereof | |
| CN102000507B (en) | Reducing gas injection and quadruple-effect catalysis purification system for diesel vehicle tail gas treatment | |
| CN111939917A (en) | DPF catalyst with good sulfur resistance and preparation method thereof | |
| CN114653396A (en) | A DPF Catalyst Coating Method Considering Low Exhaust Back Pressure and High Catalytic Efficiency | |
| CN106050372A (en) | Vehicle three-way catalytic converter for collecting integrated particulate matters | |
| KR102193496B1 (en) | Diesel oxidation catalyst with excellent heat durability and Method thereof | |
| CN113457660B (en) | Catalyst for particle catcher of gasoline car and preparation method thereof | |
| CN111821971B (en) | Integral catalyst for catalytic regeneration of carbon smoke and preparation method thereof | |
| CN114588900A (en) | Gasoline engine particle trapping catalyst and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |