CN120885249A - An environmentally friendly rare earth catalyst, its preparation method, and its application in promoting coal combustion. - Google Patents
An environmentally friendly rare earth catalyst, its preparation method, and its application in promoting coal combustion.Info
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Abstract
本发明属于煤炭燃烧技术领域，尤其涉及一种环保型稀土催化剂及其制备方法和在促进煤炭燃烧中的应用。该催化剂采用复合稀土氧化物、氧化钙、碳酸钾、硫酸亚铁、高岭土、硅藻土和特定比例的多元复合助催组分为原料，通过浆料超声活化、稀土包覆、助催分步掺杂、微波干燥及保护气氛焙烧等步骤制备而成。催化剂结构独特、分散性好，能显著提升煤炭燃烧效率，降低燃尽温度和飞灰含碳量，有效减少CO、NOx和SO2等烟气污染物排放，适用于燃煤电厂及工业锅炉的节能降碳及环保治理领域。This invention belongs to the field of coal combustion technology, and particularly relates to an environmentally friendly rare earth catalyst, its preparation method, and its application in promoting coal combustion. The catalyst uses composite rare earth oxides, calcium oxide, potassium carbonate, ferrous sulfate, kaolin, diatomaceous earth, and a specific ratio of multi-component composite catalyst aids as raw materials. It is prepared through steps including slurry ultrasonic activation, rare earth coating, stepwise doping of the catalyst aid, microwave drying, and protective atmosphere calcination. The catalyst has a unique structure and good dispersibility, significantly improving coal combustion efficiency, reducing burnout temperature and fly ash carbon content, and effectively reducing emissions of flue gas pollutants such as CO, NOx , and SO2. It is suitable for energy conservation, carbon reduction, and environmental protection in coal-fired power plants and industrial boilers.
Description
Technical Field
The invention belongs to the technical field of coal combustion, and particularly relates to an environment-friendly rare earth catalyst, a preparation method thereof and application thereof in promoting coal combustion.
Background
In recent years, along with global energy structure transformation, carbon peak and carbon neutralization targets, coal is used as a main body in a primary energy structure in China, and the problem of clean and efficient utilization of the coal is more and more remarkable. Although renewable energy sources are continuously developed, coal is an indisputable basic energy source in the fields of electric power, heating power, industrial production and the like in a medium-short period. However, the traditional coal combustion mode has the outstanding problems of low energy efficiency, serious pollutant emission, high carbon emission and the like, and directly influences the environmental quality and the energy utilization efficiency. For this reason, the industry has widely explored ways to promote the full combustion of coal, reduce pollutant emissions and improve energy efficiency by burning additives or catalysts.
The existing coal combustion improver and coal saving agent are various in variety, and comprise metal oxides, mineral auxiliary agents, organic surfactants, compound auxiliary agents and the like. In practical application, although the traditional auxiliary agents have certain improvement effects on the ignition temperature, the combustion speed and part of pollutant emission of coal, the traditional auxiliary agents have the common problems that firstly, the components are complex, the raw material cost is high, part of the auxiliary agents contain heavy metals or have potential harm to the environment and are easy to cause secondary pollution, which is contrary to the environment-friendly low-carbon development concept, secondly, part of the auxiliary agents are easy to decompose or volatilize in the high-temperature combustion environment to influence the catalytic activity and the service life, the long-term application effect is unstable, thirdly, part of the auxiliary agents have limited adaptability to different coal types, the combustion improvement effects on low-quality coal, high-ash coal and the like are not obvious, and the energy efficiency bottleneck caused by the complexity of the coal types under the practical working conditions of industrial boilers, kilns and the like can not be solved. In addition, some existing products publicize 'coal-saving and carbon-reducing', but in actual working conditions, because the technical details such as an adding mode, catalyst particle size, mixing uniformity with coal particles and the like are not in place, the theoretically expected coal-saving rate and emission reduction effect are often difficult to realize, and even the practical problems such as large auxiliary agent consumption, poor economy, complex field operation and the like occur, so that popularization and application are severely restricted.
Particularly, under the background of continuously increasing energy saving and emission reduction pressure, the control standards of pollutants such as carbon dioxide, nitrogen oxides, sulfur oxides and the like in the coal combustion process are increasingly strict. In the prior art, most of auxiliary agents do not form a synergistic mechanism in the aspects of inhibiting carbon emission, improving the combustion efficiency of coal and reducing the emission of harmful gases, and some products only can improve part of indexes and cannot comprehensively improve the clean utilization level of coal in a large-scale application scene. In addition, the preparation process of the traditional auxiliary agent is comparatively backward, the fluctuation of the product quality is larger, and the industrialization and large-scale popularization are not facilitated. Therefore, a novel coal combustion catalyst with green components, environment friendliness, wide adaptability, simple and convenient preparation, high catalytic efficiency and good economy is needed in markets and industries so as to realize the purposes of improving the coal combustion efficiency at the source, reducing the energy consumption and reducing pollutants and carbon emission, thereby helping the traditional coal industry to realize the aims of energy conservation, carbon reduction and high quality development.
In conclusion, how to develop a rare earth catalyst which is efficient, environment-friendly, cost-controllable, simple and convenient to operate, can remarkably improve the combustion efficiency of coal and has adaptability to various coals is an important technical problem to be solved in the current clean and efficient utilization field of coal.
Disclosure of Invention
The invention aims to provide an environment-friendly rare earth catalyst, a preparation method thereof and application thereof in promoting coal combustion, and aims to solve the problems of environmental protection, safety, green raw materials, secondary pollution possibly brought in the use process and the like of the existing coal combustion auxiliary agent, realize the cleanness and high efficiency of the coal combustion process, ensure the environment-friendly additive, have no harmful residues and meet the national requirements on clean utilization and sustainable development of coal.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides an environment-friendly rare earth catalyst, which is prepared from, by weight, 10-15 parts of a composite rare earth oxide, 8-18 parts of calcium oxide, 4-10 parts of potassium carbonate, 3-8 parts of ferrous sulfate, 14-20 parts of kaolin, 6-12 parts of diatomite, 5-13 parts of a multi-element composite auxiliary catalyst component and 60-80 parts of water.
Further, the composite rare earth oxide consists of cerium oxide, lanthanum oxide and neodymium oxide in a mass ratio of (5-8): 1-3.
Further, the multielement composite catalysis-assisting component consists of zirconium phosphate, strontium nitrate and sodium tripolyphosphate in a mass ratio of (1.2-1.4): (0.8-1.0): 1.
The rare earth oxide adopts a multicomponent compound design, takes cerium oxide as a main material, utilizes the unique fluorite structure and Ce 3+/Ce4+ valence-changing characteristic of the cerium oxide to dynamically release/store lattice oxygen at a combustion interface to directly catalyze a carbon oxidation reaction, takes lanthanum oxide as a structure stabilizer, takes an alkaline surface of the lanthanum oxide as a structural stabilizer to neutralize an acidic intermediate generated by sulfur in coal, reduces the discharge of corrosive gas, widens the oxygen vacancy formation energy band of CeO 2, enhances the electron transfer efficiency through f-d transition based on the unfilled 4f electron layer, forms Nd-Fe-O active clusters with Fe 2+, and accelerates the free radical chain reaction. The three are compounded in a specific proportion, and a ternary synergistic system of oxygen storage, sulfur fixation and electron transfer is constructed in an atomic scale, so that the active bottleneck of a single rare earth catalyst is broken through.
The multi-component composite catalysis assisting component of the invention adopts multi-component compound design, zirconium phosphate is taken as a proton conductor, and lamellar acid sites thereof selectively adsorb nitrogen-containing precursors such as NH 3 and the like, and pass through the surfaceThe method comprises the steps of acid catalysis to realize heterogeneous denitration at low temperature, srO generated by strontium nitrate pyrolysis is combined with aluminosilicate in coal ash to form stable glass phase to wrap unburned carbon particles, sr 2+ ions replace Ca 2+ in a perovskite structure, heat stability of a carrier is improved, sodium tripolyphosphate has functions of a dispersing agent and a chelating agent, chain anions wrap active metal particles to inhibit agglomeration, and the chain anions coordinate with rare earth ions to form a rare earth-phosphorus-oxygen bridge through P=O bonds, so that migration resistance of an active phase is enhanced.
In the basic components, calcium oxide and potassium carbonate form an alkali metal/alkaline earth metal catalytic system, the graphitization degree of coal coke is reduced, the catalytic gasification reaction is carried out, fe 2+/Fe3+ redox couple is provided by ferrous sulfate, d-f electron synergistic channels are formed by the ferrous sulfate and the rare earth components, the generation of peroxide free radicals is enhanced, and the dual-carrier framework of kaolin and diatomite realizes the gradient loading of active components and the in-situ removal of combustion flue gas through aluminosilicate mesoporous confinement effect and biological silicon micropore adsorption. The catalyst uses rare earth as a core and is synergistic with multiple elements, so that synchronous jump of coal combustion rate and environmental protection performance is realized.
The second aspect of the invention provides a preparation method of the environment-friendly rare earth catalyst, which comprises the following steps:
(1) Mixing kaolin, diatomite, calcium oxide, potassium carbonate, ferrous sulfate and water, stirring to form slurry, and carrying out ultrasonic treatment on the slurry;
(2) Mixing the composite rare earth oxide with water to prepare rare earth mixed solution, heating, adjusting pH (for example to 3.5-4.5), adding the slurry subjected to ultrasonic treatment in the step (1) into the rare earth mixed solution, and stirring for reaction to obtain rare earth coated composite slurry;
(3) Mixing the multielement composite catalysis-assisting component with water to prepare a catalysis-assisting solution, dripping the catalysis-assisting solution into the rare earth coated composite slurry, and dripping for a plurality of times (for example, dripping for three times at intervals of 10-15 minutes each time) to react to obtain catalyst slurry;
(4) Standing and curing the catalyst slurry, and then drying by microwave irradiation;
(5) And crushing and screening the dried product, roasting in a protective atmosphere, introducing reducing gas during roasting, and obtaining the environment-friendly rare earth catalyst after roasting is completed.
Further, the stirring time in the step (1) is 20-40 minutes, the ultrasonic treatment frequency is 20-30 kHz, and the stirring time is 10-20 minutes.
Further, the temperature of the heating in the step (2) is 60-80 ℃, and the stirring reaction time is 30-60 minutes.
Further, the temperature of the auxiliary solution in the step (3) is controlled to be 40-50 ℃, and vacuum negative pressure degassing treatment is carried out on reactants after the auxiliary solution is added each time.
Further, the standing and curing temperature in the step (4) is 80-90 ℃ for 1-2 hours, the power of microwave irradiation is 600-900W, and the time is 20-40 minutes.
Further, the roasting temperature in the step (5) is 500-600 ℃ for 2-4 hours, the reducing gas is mixed gas of H 2 and Ar, and the volume ratio of H 2 is 4-10%.
The preparation process realizes the directional regulation and control of the microstructure of the catalyst by multi-step precise coupling under the premise of ensuring environmental friendliness. In the slurry pre-dispersing stage of the step (1), kaolin and diatomite are preliminarily infiltrated in a water phase, clay particle aggregates are dissociated through ultrasonic cavitation and surface silicon hydroxyl groups are activated, a high-reaction-activity interface is constructed for the subsequent active component loading, calcium oxide and potassium carbonate are subjected to partial Ca 2+/K+ ion exchange in the alkaline slurry in advance to form a calcium-potassium composite base skeleton, and ferrous sulfate is embedded into carrier pores in a Fe 2+ form to lay a low-temperature catalytic activity foundation. In the rare earth coating stage of the step (2), the composite rare earth oxide is ionized in a weak acid environment, ce 3+/La3+/Nd3+ is directionally anchored on the surface of an ultrasonic activated carrier by virtue of electrostatic attraction, wherein the acidic condition selectively dissolves the edge of the rare earth oxide to form an active ion layer, meanwhile, the excessive dissolution of kaolin aluminum oxide octahedron is inhibited, the constant temperature stirring ensures that ion adsorption-hydrolytic deposition dynamic balance is completed, and a composite precursor taking aluminosilicate as a core and rare earth hydroxide as a shell is generated. The method comprises the steps of (1) gradient doping of a catalyst-assisting component, namely dropwise adding a preheated zirconium phosphate-strontium nitrate-sodium tripolyphosphate solution for multiple times, utilizing a temperature difference to promote component diffusion, enabling a precursor reaction to be fully carried out every 10-15 minutes, enabling zirconium phosphate to be condensed with rare earth hydroxyl groups on the surface of a carrier to form Zr-O-Ce bridging bonds, enabling strontium nitrate to be permeated into the inside of a pore to be decomposed into SrO seed crystals, enabling sodium tripolyphosphate to chelate free metal ions through five-membered rings to prevent segregation, removing coating bubbles after each charging in vacuum negative pressure degassing operation, avoiding micropore blockage and enhancing component compactness. curing operation in the step (4) enables the amorphous precursor to be converted into crystalline phase, and microwave irradiation avoids shell cracking caused by traditional heat drying, so as to obtain submicron particles with concentrated pore size distribution. The reduction roasting shaping in the step (5), H 2 molecules preferentially reduce the CeO 2 surface layer to generate an oxygen vacancy concentration gradient structure, meanwhile, the Fe 2+/Fe3+ redox couple is stabilized in a high-activity Fe 2+ state in a reduction atmosphere, and the inert atmosphere of Ar prevents the rare earth component from being sintered at a high temperature, so that the diatomite micropores are finally formed as transmission channels, The kaolin sheet layer is a three-dimensional catalytic system with a supporting platform, rare earth-ferrite clusters as active centers and a zirconium phosphate network as acid modification, and the unique 'core-shell-mesoporous' three-stage structure of the three-dimensional catalytic system enables the oxygen diffusion rate in the coal combustion process to be remarkably improved.
The third aspect of the invention provides an application of the environment-friendly rare earth catalyst in promoting coal combustion.
Specifically, the environment-friendly rare earth catalyst is suitable for boilers of coal-fired power plants, industrial kilns and fluidized bed combustion systems, and by adding the catalyst accounting for 0.05% -0.3% of the mass of coal, the burnout rate can be remarkably improved, the carbon content of fly ash is reduced, the emission of nitrogen oxides is synchronously reduced, and the high-efficiency conversion and near-zero pollution emission of coal resources are realized.
Compared with the prior art, the invention has the advantages that:
The environment-friendly rare earth catalyst realizes high-efficiency catalysis and pollution control in the coal combustion process through the cooperative optimization of various rare earth oxides and multi-element metal components. The unique preparation process design obviously improves the specific surface area and the dispersity of active components of the catalyst, the catalyst can effectively promote the full combustion of coal, reduce the burnout temperature, improve the combustion rate and greatly reduce the unburnt carbon in the fly ash. Practical tests show that after the catalyst is added, the burn-out rate of coal is improved, the emission of harmful gases such as CO, NO x、SO2 and the like is obviously reduced, and the environmental protection indexes of smoke are obviously improved. Meanwhile, the catalyst component is safe and environment-friendly, the raw material sources are wide, the process can be amplified industrially, secondary pollution is avoided in the use process, the adaptability is high, and the catalyst can be widely applied to different coal types and various industrial combustion systems. Compared with the prior art, the product provided by the invention has the advantages of high efficiency, low emission, environmental friendliness and the like, and provides a solid technical support for promoting the development of green low carbon in the coal industry.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The raw materials used in the examples are all common commercial products unless otherwise specified, and the following sources are exemplified.
Cerium oxide was purchased from su state zirconium nanomaterial limited. Lanthanum oxide and neodymium oxide are purchased from new materials, inc. of Ganz Gao Cheng. Calcium oxide was purchased from Yihui calcium industries, inc. of Leping. Kaolin was purchased from shanxi brand calcined kaolin limited. Diatomaceous earth was purchased from kieselguhr products limited, county, korea, long white. Zirconium phosphate was purchased from Fujian Ruison New Material Co., ltd. Strontium nitrate was purchased from Shandong Desheng New Material Co. Sodium tripolyphosphate was purchased from Hebei Ten thousand Metallurgical chemical Co.
Example 1
The embodiment provides an environment-friendly rare earth catalyst, which is prepared from the following raw materials, by weight, 13 parts of a composite rare earth oxide, 12 parts of calcium oxide, 8 parts of potassium carbonate, 5 parts of ferrous sulfate, 16 parts of kaolin, 10 parts of diatomite, 9 parts of a multi-element composite auxiliary catalyst component and 75 parts of water.
The composite rare earth oxide consists of cerium oxide, lanthanum oxide and neodymium oxide in a mass ratio of 6:2:2.
The multielement composite catalysis assisting component consists of zirconium phosphate, strontium nitrate and sodium tripolyphosphate in a mass ratio of 1.3:0.9:1.
The preparation method of the environment-friendly rare earth catalyst comprises the following steps:
(1) The preparation method comprises the steps of weighing kaolin, diatomite, calcium oxide, potassium carbonate and ferrous sulfate according to a proportion, adding 60 parts of deionized water, placing in a reaction kettle, mechanically stirring for 30 minutes at 300rpm to form slurry, transferring the slurry to an ultrasonic reactor, and treating for 15 minutes at a frequency of 25kHz to complete carrier activation and component pre-dispersion.
(2) Mixing the composite rare earth oxide with 10 parts of deionized water, stirring to form a rare earth mixed solution, heating to 70 ℃, dropwise adding 10% dilute nitric acid solution to adjust the pH value to 4.0, slowly adding the slurry obtained in the step (1) into the rare earth mixed solution, maintaining the constant temperature at 70 ℃ and stirring at the rotating speed of 400rpm for reacting for 45 minutes, thus obtaining the rare earth coated composite slurry.
(3) Mixing the multielement composite catalysis-assisting component with 5 parts of deionized water, heating to 45 ℃ to prepare a catalysis-assisting solution, dropwise adding the catalysis-assisting solution into the slurry obtained in the step (2) in three equal amounts under continuous stirring, wherein each dropwise adding time is 12 minutes, immediately applying vacuum negative pressure of-0.08 MPa to the system for degassing treatment for 5 minutes after each dropwise adding, eliminating bubbles at a coating interface, and continuing to react for 20 minutes after all dropwise adding is completed to obtain a viscous catalyst slurry.
(4) The catalyst slurry is transferred to a constant temperature curing tank, kept stand and cured for 1.5 hours at 85 ℃, the cured material is placed in a microwave dryer, and is irradiated and dried for 30 minutes under the power of 750W, and the final water content of the material is controlled to be 1%.
(5) Crushing the dried product, sieving with a 200-mesh sieve, loading into a tube type roasting furnace, heating to 550 ℃ at a speed of 5 ℃ per min under the protection of argon, switching to introduce H 2/Ar mixed gas, roasting at constant temperature for 3 hours, naturally cooling to room temperature, taking out, and sealing and storing to obtain the environment-friendly rare earth catalyst.
Example 2
The embodiment provides an environment-friendly rare earth catalyst which is different from the embodiment 1 in that the preparation raw materials comprise, by weight, 15 parts of composite rare earth oxide, 10 parts of calcium oxide, 8 parts of potassium carbonate, 5 parts of ferrous sulfate, 14 parts of kaolin, 12 parts of diatomite, 6 parts of a multi-element composite co-catalyst component and 75 parts of water.
Comparative example 1
The comparative example provides an environment-friendly rare earth catalyst, which is different from the example 1 in that the preparation raw materials comprise, by weight, 16 parts of composite rare earth oxide, 12 parts of calcium oxide, 8 parts of potassium carbonate, 1 part of ferrous sulfate, 16 parts of kaolin, 10 parts of diatomite, 4 parts of a multi-element composite co-catalyst component and 75 parts of water.
Comparative example 2
The comparative example provides an environment-friendly rare earth catalyst, which is different from the example 1 in that the composite rare earth oxide consists of cerium oxide, lanthanum oxide and neodymium oxide in a ratio of 2:3:6.
Comparative example 3
The comparative example provides an environment-friendly rare earth catalyst, which is different from the example 1 in that the multielement composite catalyst component consists of zirconium phosphate, strontium nitrate and sodium tripolyphosphate in a ratio of 0.5:1:1.
Comparative example 4
This comparative example provides an environmentally friendly rare earth catalyst, differing from example 1 in that the multi-component co-catalyst component is replaced with ethylenediamine tetraacetic acid (EDTA).
Comparative example 5
The comparative example provides an environment-friendly rare earth catalyst, which is different from the embodiment 1 in that the preparation method of the environment-friendly rare earth catalyst comprises the following steps:
(1) The kaolin, the diatomite, the calcium oxide, the potassium carbonate and the ferrous sulfate are weighed according to the proportion, 60 parts of deionized water is added, and the mixture is placed in a reaction kettle and mechanically stirred for 40 minutes at 300rpm to obtain slurry.
(2) Mixing the composite rare earth oxide with 10 parts of deionized water, stirring to form rare earth mixed solution, slowly pouring the slurry obtained in the step (1) into the rare earth mixed solution, and continuously stirring at 300rpm at room temperature for reaction for 50 minutes to obtain the rare earth coated composite slurry.
(3) Mixing the multielement composite catalysis-assisting component with 5 parts of deionized water, stirring at normal temperature for dissolution, adding the mixture into the rare earth coating slurry obtained in the step (2) at one time, and continuing stirring for 50 minutes to obtain catalyst slurry.
(4) The catalyst slurry was poured into a baking pan, placed in a forced air drying oven, dried at 105 ℃ for 6 hours under normal pressure until the material was sufficiently dried, and taken out and cooled to room temperature.
(5) Crushing the dried product, sieving with a 200-mesh sieve, loading into a muffle furnace, heating to 500 ℃ at a speed of 10 ℃ per min under an air atmosphere, roasting for 2 hours at a constant temperature, naturally cooling to room temperature after roasting, and taking out to obtain the environment-friendly rare earth catalyst.
Performance testing
The rare earth catalysts prepared in examples 1-2 and comparative examples 1-5 were subjected to performance testing as follows:
1. burn-up rate improvement (%)
The catalyst and the power coal are uniformly mixed according to the mass ratio of 1:500, the mixture is taken and put into a crucible, and the crucible is placed into a muffle furnace to burn for 60 minutes at the constant temperature of 850 ℃. And (5) weighing residual ash after cooling, and calculating the burnout rate and comparing the lifting amplitude by combining the raw coal and the residual ash after adding the catalyst.
2. Carbon content (%)
The coal was mixed with the catalyst and burned as in 1 above, and fly ash after combustion was collected. Taking a certain amount of fly ash sample, removing all carbon by a full burning method, weighing the rest substances, and calculating the mass percent of unburned carbon in the fly ash by the front-rear mass difference.
3. Burnout temperature (°c)
The catalyst and the power coal are uniformly mixed according to the mass ratio of 1:500, the sample is placed in a thermogravimetric analyzer, and the mixture is heated at the temperature rising rate of 10 ℃ per minute under the air atmosphere, and the temperature is raised to 700 ℃ from the room temperature. And recording a sample weight loss curve, wherein when the weight loss is basically finished and the weight loss is stable, the corresponding temperature is the burnout temperature.
4. Combustion rate (%/min)
Using the thermogravimetric analysis data described above, the slope of the fastest phase of weight loss, i.e., the mass loss rate per unit time of the main combustion section, was analyzed as the combustion rate.
5. CO in the flue gas NO x、SO2 emission reduction rate (%)
The catalyst and the power coal are uniformly mixed according to the mass ratio of 1:500, are combusted in a small-sized analog combustion device, and the combustion tail gas is collected through a flue gas sampling tube. The volume concentrations of CO and NO x、SO2 are respectively measured by a portable flue gas analyzer, and compared with the combustion result of blank coal without catalyst, the reduction percentage of each gas emission is calculated.
The test results are shown in Table 1.
TABLE 1 Performance test results
The performance of the catalysts in examples 1 and 2 shows that the compound system and the preparation process of the invention are beneficial to the efficient, rapid and clean combustion of coal, and promote the catalytic performance and the emission reduction effect.
The iron component and the multi-element composite catalyst promoter in the catalyst are weakened due to the reduction of the content of ferrous sulfate and the consumption of the multi-element composite catalyst promoter in comparative example 1, so that the oxidation-reduction capability, the electron transfer capability and the multi-element synergistic catalytic capability of the catalyst are all influenced in the coal combustion process, the full combustion of coal and the pollutant emission reduction are difficult to effectively promote, and the necessity of the co-optimization design of the iron element and the multi-element catalyst promoter in the invention is reflected. The proportion of the rare earth oxide in comparative example 2 deviates from the optimal proportion, the catalytic activity is reduced, the burnout temperature is higher, the burnout rate is improved to a limited extent, and the decisive effect of reasonable rare earth compounding is demonstrated. Comparative example 3 the ratio adjustment of the multielement co-catalytic components was not reasonable, zirconium phosphate was insufficient, both catalyst structure and activity were affected, resulting in reduced performance, and both burn rate and emissions reduction were weaker than in the examples. After EDTA replaces the inorganic accelerator system in comparative example 4, the catalyst has basically lost the synergism, the catalytic effect is worst, the burnout temperature is highest, the burnout rate and the emission reduction range are lowest, which indicates that the organic chelating agent has limited effect in the system. Comparative example 5 the catalyst microstructure and dispersibility were poor, the specific surface area was low, the combustion performance and the emission reduction were retarded, and the importance of the special preparation process of the present invention was highlighted.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
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