CN100395028C - Porous catalytic filtering metal material and its prepn - Google Patents
Porous catalytic filtering metal material and its prepn Download PDFInfo
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- CN100395028C CN100395028C CNB2005101172858A CN200510117285A CN100395028C CN 100395028 C CN100395028 C CN 100395028C CN B2005101172858 A CNB2005101172858 A CN B2005101172858A CN 200510117285 A CN200510117285 A CN 200510117285A CN 100395028 C CN100395028 C CN 100395028C
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- 230000003197 catalytic effect Effects 0.000 title claims abstract description 38
- 238000001914 filtration Methods 0.000 title claims abstract description 31
- 239000007769 metal material Substances 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 32
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 31
- 239000000956 alloy Substances 0.000 claims abstract description 31
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 6
- 239000003054 catalyst Substances 0.000 claims description 55
- 239000010935 stainless steel Substances 0.000 claims description 38
- 229910001220 stainless steel Inorganic materials 0.000 claims description 38
- 239000011148 porous material Substances 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 25
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- 238000005245 sintering Methods 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000007598 dipping method Methods 0.000 claims description 5
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 claims description 3
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- 229910052751 metal Inorganic materials 0.000 abstract description 52
- 239000002184 metal Substances 0.000 abstract description 52
- 238000000034 method Methods 0.000 abstract description 25
- 238000002360 preparation method Methods 0.000 abstract description 22
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 21
- 239000003546 flue gas Substances 0.000 abstract description 20
- 239000007789 gas Substances 0.000 abstract description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 12
- 239000000470 constituent Substances 0.000 abstract description 8
- 238000006477 desulfuration reaction Methods 0.000 abstract description 8
- 230000023556 desulfurization Effects 0.000 abstract description 8
- 150000002739 metals Chemical class 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 5
- 230000007704 transition Effects 0.000 abstract description 5
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000969 carrier Substances 0.000 abstract 1
- 229910052815 sulfur oxide Inorganic materials 0.000 abstract 1
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000005406 washing Methods 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 9
- 239000011159 matrix material Substances 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 239000000919 ceramic Substances 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 5
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- 238000012545 processing Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000012855 volatile organic compound Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- 230000003009 desulfurizing effect Effects 0.000 description 3
- 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 3
- 238000001035 drying Methods 0.000 description 3
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
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- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
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Abstract
The present invention belongs to the field of sintered metal products, which relates to a gas catalytic filtering material and a preparation method thereof. The porous catalytic filtering metal material is composed of porous metals or alloy basal bodies, an intermediate transition layer and active constituents. The preparation method of the porous catalytic filtering metal material of the present invention comprises the following process steps: preparing the porous metals or the alloy basal bodies and preparing the intermediate transition layer and the load active constituents. The gas catalytic filtering material of the present invention uses the porous metals as carriers, uses transition metal oxides as active constituents, has the excellent characteristics of low-density, large specific surface area, high porosity, good heat conduction performance, etc., and has the advantages of uniform distribution of the active constituents, firm loads, good catalytic activity and good heat stability. The course of preparing the catalytic filtering material is simple, the cost is lower, and the industrialization is easy to realize. The gas catalytic filtering material is suitable for the purification of VOC, HC and NOx in high temperature gas, and is suitable for the purification process of simultaneous dust removal, desulfurization and denitration for high temperature flue gas containing sulfur oxides and nitrogen oxides.
Description
Technical field
The invention belongs to sintered metal product and catalysis material field, relate to oxidation catalyst filter material and preparation method thereof.
Background technology
Oxidation catalyst filter material attached catalyst active component and forming on porous filter material or element, it has demonstrated fully the design feature and the catalysis characteristics of porous material, can be in to gas in particle filtration, the capture, to the harmful constituent in the gas phase, as NO
X, VOC (Volatile Organic Compounds), hydrocarbon, Jiao Zhi etc. carry out catalyzed conversion, that realizes filtering, purify is integrated, thereby can simplify technical process, reduces equipment investment greatly, improves energy utilization rate, saves the space.
CN1476929 discloses a kind of with CeTi
2O
6Be denitrating catalyst of carrier and preparation method thereof.This method is CeTi
2O
6Compound constitutes with CeTi after load has noble metal or CuO base metal active component as catalyst carrier again
2O
6Compound is the denitrating catalyst of carrier, and this method has better low temperature activity to the NO reduction reaction, when consisting of CO:6%, and NO:6%, the waste gas of He:88% is 5000h at 175 ℃ at present and with the superficial linear velocity in a column
-1By the time, the NO conversion ratio is up to 75%.
CN1275435 discloses a kind of flue gas purifying catalyst.This catalyst is made up of the composite oxides of magnesium, aluminium, at least a transition metal and at least a thulium, and this catalyst is made through roasting by the mixture of bedded substance that contains Mg, Al and transition metal with hydrotalcite structure and rare earth hydrous oxide; This catalyst can remove nitrogen oxide, oxysulfide and the carbon monoxide in the flue gas simultaneously, and has the steady foot of excellent hydrothermal.
CN1401416 discloses a kind of iolite honeycomb ceramic catalyst that is used for flue-gas denitrification and its production and application.It is first carrier that this catalyst is to use cordierite honeycomb ceramic, and the activated alumina film is second carrier, and CuO is an active component, and wherein activated alumina content is 3-5.3%, and the CuO loading is 1.25-15wt.%.Adopt the preparation method that cordierite honeycomb ceramic is coated with activated alumina film, the denitrification catalyst of Supported CuO preparation again.It is low that the present invention has a cost, the intensity height, and high denitrification activity, and good water repelling property and anti-SO are arranged
2Poison the advantage of performance.
CN1457920 discloses a kind of ceramic honeycomb catalyst and preparation and application that is used for flue gas and desulfurizing and denitrifying.This catalyst is to be first carrier with the cordierite honeycomb ceramic after the surface treatment, and the activated alumina film is second carrier, load active component CuO and Na
2O, the consisting of of catalyst: ceramic 70-81wt.%, activated alumina 19-30wt.%, carrier loaded 8.5-12.5 gram CuO of per 100 grams and 4.0-5.4 gram Na
2O.Denitration rate to the normal pressure flue gas reaches about 88%, and desulfurization degree was greater than 80% o'clock adsorbed SO of every gram catalyst
2Amount is that bed resistance is little, is applicable to industrial applications about 62mg.
CN1593756 discloses a kind of preparation method of metallic honeycomb substrate catalyst.This catalyst mainly be with nickel chromium stainless steel honeycomb (abbreviating metal beehive carrier as) as first carrier, the active oxidation aluminium powder is second carrier, also adds the oxide such as the CeO of a small amount of rare earth element in addition
2, La
2O
3, ZrO
2, Y
2O
3As promoter and stabilizing agent; Active component is mainly PtO
2Or the combination of PdO or two kinds of materials.The coating difficult drop-off of the metallic honeycomb substrate catalyst of this method preparation, the ignition performance is good, has higher three-way catalyst activity, CO, HC, the NOx in the purifying exhaust gas simultaneously, but the action pane of broad is arranged.
More than many in the disclosed flue gas purifying method in each patent be carrier with the inorganic oxide, adopt the method for multiple oxide catalyst to improve activity of such catalysts, to reach the nitrogen oxide that removes simultaneously in the flue gas, the purpose of oxysulfide, make Preparation of catalysts become complicated, also increased the cost of catalyst simultaneously.In addition, because of adopting oxide, there is the problem that heat conductivility is poor, thermal shock resistance is low in the above-mentioned patent as catalyst carrier.
Summary of the invention
The object of the present invention is to provide that a kind of preparation process is simple, catalysis and good porous catalytic filtering metal material and the preparation method of strainability.Dedusting when the present invention is applicable to the purification of high-temperature gas NOx, VOC, HC and sulfur-containing oxide, nitrogen oxide containing gas, desulfurization, denitration purification process.
A kind of porous catalytic filtering metal material of the present invention is made up of metal or alloy porous material substrate, intermediate layer and active component.Intermediate layer handle by preliminary treatment, sol-gel and sintering attached to each surface of metal or alloy porous material substrate, form catalyst support layer, active component by dipping and sintering attached on the catalyst support layer.
Described metal or alloy porous material substrate be in chip, tubular type, the column type any.
Described metal or alloy porous material substrate material is Fe
3Among Al, Fe-Cr-Al, stainless steel 316, stainless steel 316L, stainless steel 304, stainless steel 304L, the stainless steel 310S any, the average pore size of metal or alloy porous material is that 5～100 μ m, porosity are 30～80%.
Attached to one of effect of each surperficial intermediate layer of metal or alloy porous material substrate is the specific area that increases the metal or alloy porous material, two of its effect is that the load for catalytic active component provides the place, make catalytic active component can with the Lacunaris metal carrier strong bonded, also strengthen the bond strength of intermediate layer and metal or alloy porous material substrate.
Described active component is transition metal oxide CuO, TiO
2, V
2O
5, WO
3, Fe
2O
3, MoO
3In any.With the transition metal oxide is active component, has that density is low, specific surface is big, porosity is high and excellent specific property such as good heat conductivity; And active component is evenly distributed, load is firm, catalytic activity is good, Heat stability is good.The preparation process of this oxidation catalyst filter material is simple, and cost is lower, is easy to realize industrialization.
The content of active component is 2～7% of porous catalytic filtering metal material overall weight, its decentralization is that 50～80% (decentralization is meant the surface atom number of active component in the catalyst and the ratio of active component total atom number, be the parameter that is used for characterizing catalyst surface active component degree of scatter), active component mainly is distributed on the intermediate layer of porous carrier.
The preparation method of porous catalytic filtering metal material of the present invention, its processing step comprises the preparation of metal or alloy porous material substrate, preparation intermediate layer and load active component:
1. metal or alloy porous material substrate preparation
The material that the metal or alloy porous material substrate is adopted is Fe
3Any after matrix material is selected, adopts method commonly known in the art to prepare the metal or alloy porous material substrate among Al, Fe-Cr-Al, stainless steel 316, stainless steel 316L, stainless steel 304, stainless steel 304L, the stainless steel 310S;
2. the preparation of intermediate layer
Intermediate layer adopts two-step method to make:
The first step is carried out preliminary treatment to the metal or alloy porous material substrate, forms transition zone:
The metal or alloy porous material substrate for preparing is immersed cleaning in the conventional washing lotion, oven dry; Then the metal or alloy porous material substrate is immersed NaOH, NaNO
2, KMnO
4, CrO
3Handle in highly acid or the strong basicity oxidation liquid, form transition zone, treatment temperature is 50～160 ℃, and the processing time is 3～60min; The concentration of highly acid or strong basicity oxidation liquid is 80～800g/L.
Second step, adopt existing sol-gel process through pretreated metal or alloy porous material substrate transition zone surface-coated one deck oxide skin(coating), after roasting, generate catalyst support layer:
To immerse in the colloidal sol for preparing through the good metal or alloy porous material substrate of preliminary treatment, colloidal sol is SiO
2, TiO
2, Al
2O
3, ZrO
2, CeO
2In any, flood after 0.5～2 hour and to take out, dry under the room temperature, place the sintering kiln roasting again, sintering temperature is 300～1200 ℃, roasting time is 1～5 hour, makes intermediate layer after the roasting; One of purpose of preparation intermediate layer is the specific area that increases the metal or alloy porous material, and two of its effect is that the load for catalytic active component provides the place, make catalytic active component can with metal or alloy porous material carrier strong bonded.
3. load active component
Adopt existing known infusion process, the metal or alloy porous material substrate of surface attachment intermediate layer is immersed in the prefabricated active component solution, and adopt excessive infusion process load one deck active component on intermediate layer, impregnation technology is: active component solution concentration 0.5～5mol/L, 40～150 ℃ of temperature, time 2～7h.
Take out subsequently and dry, place the sintering kiln roasting again, sintering temperature is 300～800 ℃, and roasting time is 1～5 hour, makes porous catalytic filtering metal material of the present invention after the roasting.The employing transition metal oxide is an active component, is carried on the metal or alloy porous material substrate, and the catalyst that obtains is active high, and active component is evenly distributed and combines firmly with carrier.
The prepared porous catalytic filtering metal material of the present invention is matrix, is active component with the transition metal oxide with the metal or alloy porous material, has that density is low, specific surface is big, porosity is high and excellent specific property such as good heat conductivity; And active component is evenly distributed, load is firm, and catalytic activity is good, Heat stability is good.This Preparation of catalysts process is simple, and cost is lower, is easy to realize industrialization.
Compared with prior art, the present invention has following advantage:
(1) porous catalytic filtering metal material employing of the present invention as catalyst carrier, has the catalytic activity height through the metal or alloy porous material substrate of modification, Heat stability is good, the advantage that catalyst life is long.
(2) oxidation catalyst filter material of the present invention is that the metal or alloy porous material with modification is a carrier, has high specific surface, excellent mechanical intensity, heat conductivility and thermal shock resistance, and this oxidation catalyst filter material can be applicable in the working environment of higher temperature.
(3) active component of oxidation catalyst filter material of the present invention is scattered in the carrier intermediate layer, and this catalyst has the advantage that active component is evenly distributed, load is firm, the catalytic action of easier performance active component.
(4) carrier of the present invention intermediate layer is made up of thin oxide film and oxide skin(coating) from the inside to surface, combines with carrier firmly, and no crack performance produces.
(5) the present invention is applicable to multi-form oxidation catalyst filter elements such as preparation chip, tubular type, can be used for high-temperature gas VOC, HC, NOx purifies, and the dedusting of high-temperature flue gas, desulfurization, denitrification integral purification process.
The specific embodiment
Embodiment 1
With Fe
3The Al alloy is a matrix material, adopts conventional powder metallurgy process to make Fe
3The Al metal polyporous material, this Fe
3The porosity of Al metal polyporous material is 33%, and average pore size is 10 μ m, is shaped as disk, and it is of a size of φ 14 * 2.0mm, with Fe
3Al metal polyporous material disk is used the hexane washing by soaking earlier as matrix, and again with the soaked in absolute ethyl alcohol washing, the oven dry back is stand-by after the taking-up.
Will through washing by soaking, the oven dry after stand-by Fe
3Al metal polyporous material disk carries out preliminary treatment, and pretreatment fluid is CrO
3Solution, process conditions are: CrO
3Solution concentration 400g/L, 80 ℃ of treatment temperatures, processing time 8min takes out drying for standby.
Will be through pretreated Fe
3Al metal polyporous material disk immersed in the alumina sol make, flood after 1 hour to dry under the taking-up room temperature, places sintering furnace again, 800 ℃ of roasting temperatures 2 hours.Make intermediate layer after the roasting.
To adhering to the Fe of intermediate layer
3Al metal polyporous material disk carries out the load of active component to be handled, and adopts excessive infusion process, will adhere to the Fe of intermediate layer
3Al metal polyporous material disk is immersed in NH
4VO
3In the solution, active component solution NH
4VO
3Concentration be 2.6mol/L, make it at Fe behind the dipping
3Load one deck V on the intermediate layer of Al porous metals disk
2O
5Active component is taken out subsequently and is dried, and places the sintering kiln roasting again, and sintering temperature is 500 ℃, and roasting time is 2 hours, makes porous catalytic filtering metal material of the present invention after the roasting.V
2O
5Active constituent catalyst content is the Fe that makes
3Al porous catalytic filtering metal material gross weight 3.0wt%.
To Fe
3The Al porous catalytic filtering metal material carries out the activity check and estimates
The Fe of method for preparing will be adopted
3The Al porous catalytic filtering metal material carries out the activity check in high-temperature flue gas.In the catalytic reaction analogue means of laboratory, carry out the evaluation experimental of catalyst, adopt and select catalytic reduction method, with NH
3As reducing agent.Assess sample is the porous metals oxidation catalyst filter sheet of φ 14 * 2.0mm.The composition of unstripped gas is (v%): NO (0.04), CO (0.015), SO
2(0.03), CO
2(12.0), O
2(9.8), N
2Be balance gas, the air-flow air speed is 9000h
-1～36000h
-1, 340 ℃ of operating temperatures.
Reducing agent NH3 imports in the flue gas NO:NH in the mode of winding-up
3Be 1: (1～1.2).High-temperature flue gas by the online detection gas componant of flue gas analyzer, is determined the denitration rate by behind the porous metals oxidation catalyst filter sheet.The result shows, is 340 ℃ in operating temperature, air speed～24000h
-1, import NO concentration under 400～800ppm condition, the denitration rate is greater than 90%, outlet NO concentration is less than 60ppm.
Embodiment 2
With stainless steel 316L is matrix material, adopt conventional powder metallurgy process to make stainless steel 316L porous metal material, the porosity of this stainless steel 316L porous metal material is 38%, and average pore size is 40 μ m, makes tubular unit, it is of a size of φ 30 * 200mm, wall thickness 4mm as matrix, uses earlier the hexane washing by soaking with stainless steel 316L metal polyporous material tubular unit, again with the soaked in absolute ethyl alcohol washing, the oven dry back is stand-by after the taking-up.
To after washing by soaking, oven dry, stand-by stainless steel 316L porous metal material tubular unit carry out preliminary treatment, pretreatment fluid is a NaOH strong basicity oxidizing solution, process conditions are: the concentration of NaOH strong basicity oxidizing solution is 600g/L, 140 ℃ of treatment temperatures, processing time 30min takes out drying for standby.
To immerse the SiO that makes through pretreated stainless steel 316L metal polyporous material tubular unit
2In the colloidal sol, flood after 0.8 hour to take out under the room temperature and dry, place sintering furnace again, 900 ℃ of roasting temperatures 1.5 hours.Make intermediate layer after the roasting.
The stainless steel 316L porous metal material tubular unit of adhering to intermediate layer is carried out the load of active component and handle, adopt excessive infusion process, the stainless steel 316L porous metal material tubular unit that will adhere to intermediate layer is immersed in Cu (NO
3)
2In the solution, active component solution Cu (NO
3)
2Concentration be 2.1mol/L, make it load one deck CuO active component on the intermediate layer of stainless steel 316L porous metal material tubular unit behind the dipping, take out subsequently and dry, place the sintering kiln roasting again, sintering temperature is 350 ℃, roasting time is 2.5 hours, makes porous catalytic filtering metal material of the present invention after the roasting.CuO active constituent catalyst content is the stainless steel 316L porous catalytic filtering metal material gross weight 2.4wt% that makes.
Stainless steel 316L porous catalytic filtering metal material is carried out activity check and evaluation
To adopt the oxidation catalyst filter material of method for preparing in high-temperature flue gas, to carry out activity rating.In the catalytic reaction analogue means of laboratory, carry out the evaluation experimental of catalyst, adopt and select catalytic reduction method, with NH
3As reducing agent.The oxidation catalyst filter tubular unit is of a size of φ 30 * 200mm, wall thickness 4mm.The composition of unstripped gas is (v%): NO (0.08), CO (0.015), SO
2(0.03), CO
2(15.0), O
2(4.0), surplus is N
2, the air-flow air speed is 18000h
-1, operating temperature is 350 ℃.
Reducing agent NH
3Mode with winding-up is imported in the flue gas NO:NH
3Be 1: (1～1.2).High-temperature flue gas by the online detection gas componant of flue gas analyzer, is determined the denitration rate by behind the porous metals oxidation catalyst filter sheet.The result shows, is 350 ℃ in operating temperature, and air speed is 18000h
-1, import NO concentration under 500～700ppm condition, the denitration rate is greater than 90%, outlet NO concentration is less than 50ppm.
Embodiment 3
With stainless steel 310S is matrix material, adopt conventional method to make stainless steel 310S metal polyporous material, the porosity of stainless steel 310S metal polyporous material is 40%, and average pore size is 20 μ m, makes tubular unit, it is of a size of φ 50 * 500mm, wall thickness 4mm as matrix, uses earlier the hexane washing by soaking with stainless steel 310S metal polyporous material pipe fitting, again with the soaked in absolute ethyl alcohol washing, the oven dry back is stand-by after the taking-up.
To carry out preliminary treatment by stand-by stainless steel 310S metal polyporous material pipe fitting after washing by soaking, oven dry, pretreatment fluid is a KMnO4 solution, and process conditions are: KMnO4 solution concentration 300g/L, and 100 ℃ of treatment temperatures, processing time 19min takes out drying for standby.
To immerse in the alumina sol that makes through the metal porous pipe fitting of pretreated stainless steel 310S, and flood after 1 hour and dry under the taking-up room temperature, place sintering furnace again, 800 ℃ of roasting temperatures 2 hours.Make intermediate layer after the roasting.
The metal porous pipe fitting of stainless steel 310S that adheres to intermediate layer is carried out the load of active component and handle, adopt excessive infusion process, the metal porous pipe fitting of stainless steel 310S that will adhere to intermediate layer is immersed in NH
4VO
3In the solution, active component solution NH
4VO
3Concentration be 2.8mol/L, make it load one deck V on the intermediate layer of the metal porous pipe fitting of stainless steel 310S behind the dipping
2O
5Active component is taken out subsequently and is dried, and places the sintering kiln roasting again, and sintering temperature is 450 ℃, and roasting time is 3 hours, makes porous catalytic filtering metal material of the present invention after the roasting.V
2O
5Active constituent catalyst content is the stainless steel 310S porous catalytic filtering metal material gross weight 3.9wt% that makes.
Stainless steel 310S porous catalytic filtering metal material carries out desulfurization, denitration and dust removal integrated experimental evaluation
To adopt the oxidation catalyst filter material of method for preparing in the high temperature coal flue gas, to carry out desulfurization, denitration and dust removal integrated experimental evaluation.As experiment porch, carry out desulfurization with fixed bed reactors, adopt selective catalytic reduction to utilize NH with the calcium hydroxide desulfurizing agent
3Carry out denitration.Desulfurizing agent (325 order) and NH
3Mode with winding-up is imported in the flue gas NO: NH
3It is 1: 1.1.Assess sample is a tubular unit, and it is of a size of φ 50 * 500mm, wall thickness 4mm.The composition of unstripped gas is (v%): NO (0.04-0.08), CO (0.015), SO
2(0.1-0.3), CO
2(15.0), O
2(4.0), N
2Be balance gas.Dust contained flue gas concentration: 4000-10000mg/Nm
3The air-flow air speed is 10000-30000h
-1, operating temperature is 300-500 ℃.
The result shows, is 330 ℃ in operating temperature, air speed～16000h
-1, import NO concentration under 400～800ppm condition, desulfurization degree is greater than 80%, the denitration rate is greater than 90%, outlet SO
2, NO concentration is respectively less than 350ppm, 60ppm.Efficiency of dust collection reaches more than 99.9%, and the dust content of exit gas is less than 10ppm.
Claims (3)
1. porous catalytic filtering metal material is characterized in that this oxidation catalyst filter material is made up of alloy porous material substrate, intermediate layer and active component; Intermediate layer handle by preliminary treatment, sol-gel and sintering attached to each surface of alloy porous material substrate, form catalyst support layer, active component by dipping and sintering attached on the catalyst support layer;
Active component is transition metal oxide CuO, TiO
2, V
2O
5, WO
3, Fe
2O
3, MoO
3In any,
The content of active component is 2～7% of porous catalytic filtering metal material overall weight, and its decentralization is 50～80%.
2. porous catalytic filtering metal material according to claim 1, it is characterized in that the alloy porous material substrate be in chip, tubular type, the column type any.
3. porous catalytic filtering metal material according to claim 1, the material that it is characterized in that the alloy porous material substrate is Fe
3Among Al, Fe-Cr-Al, stainless steel 316, stainless steel 316L, stainless steel 304, stainless steel 304L, the stainless steel 310S any;
The average pore size of alloy porous material substrate is that 5～100 μ m, porosity are 30～80%.
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