Catalyst for treating exhaust gas of automobile and preparation method thereof
By loading modified alumina and precious metals onto the automotive exhaust catalyst carrier, the problem of small specific surface area was solved, the catalytic performance and service life of the catalyst were improved, and a more efficient exhaust purification effect was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI SOBLUE ENVIRONMENT PROTECTION TECH CO LTD
- Filing Date
- 2026-02-11
- Publication Date
- 2026-05-26
AI Technical Summary
The small specific surface area of existing automotive exhaust catalyst supports results in insufficient exposure of precious metal active sites, limiting the catalytic reaction rate and making it difficult to meet stricter emission standards.
By loading modified alumina and noble metals onto a support, and adding lanthanum and polyvinyl alcohol using the sol-gel method, the specific surface area and adhesion are increased, and porous ceramic spheres are prepared as a support to improve mechanical strength and catalytic performance.
It significantly improves the catalytic performance and service life of the catalyst. The high specific surface area and excellent high temperature resistance of the support can effectively disperse the active components and enhance the catalytic reaction efficiency and durability.
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Abstract
Description
Technical Field
[0001] This invention belongs to the field of automotive exhaust gas treatment technology, specifically relating to a catalyst for automotive exhaust gas treatment and its preparation method. Background Technology
[0002] The main pollutants in automobile exhaust are carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). x The emissions from automobile exhaust constitute three components. Furthermore, automobile exhaust emissions severely pollute the air, are a major contributing factor to smog formation, seriously impact traffic safety and human health, and cause significant harm to daily life and production. Therefore, reducing automobile exhaust pollutant emissions is a crucial issue that urgently needs to be addressed.
[0003] Among numerous exhaust gas purification technologies, catalytic purification technology has become the mainstream solution due to its high efficiency and reliability. The core of this technology lies in high-performance catalysts, which typically consist of three parts: active components, co-catalysts, and catalyst supports. The catalyst support not only disperses and stabilizes the highly reactive noble metals (such as platinum, palladium, and rhodium) or transition metal oxide active components, but also directly determines the catalyst's mechanical strength, thermal stability, and effective specific surface area in contact with exhaust gas, thus having a decisive impact on the overall performance and lifespan of the catalyst.
[0004] Currently, widely used catalyst supports for automotive exhaust mainly include cordierite honeycomb ceramic supports and metal supports. Cordierite supports are widely used due to their low coefficient of thermal expansion and relatively low cost. However, in the preparation of high-performance catalysts, especially to meet more stringent emission standards, catalyst design tends towards ultra-high porosity and ultra-thin wall thickness to reduce back pressure and improve ignition rate. Simultaneously, thicker, more functional layered coatings are required to support more complex catalytic components. These technical requirements pose unprecedented challenges to the mechanical strength of the support itself. Furthermore, the small specific surface area of the catalyst has become one of the key bottlenecks restricting its activity and purification efficiency. The specific surface area of traditional cordierite honeycomb ceramics is typically only 0.5~2 m² / g, far from sufficient to fully disperse the noble metal active components, resulting in insufficient exposure of active sites and limited catalytic reaction rates. Therefore, it is necessary to effectively increase its specific surface area through support structure design or surface modification to enhance the dispersibility and stability of the catalytic components. Summary of the Invention
[0005] To solve the above-mentioned technical problems, the present invention provides a catalyst for automobile exhaust treatment and its preparation method. The present invention increases the specific surface area of the support and the adhesion to the active components by loading modified alumina on the support, and then loading noble metals on the support. Through the above method, the catalytic performance and service life of the catalyst are significantly improved.
[0006] The objective of this invention can be achieved through the following technical solutions: The first aspect of this invention provides a method for preparing a catalyst for automobile exhaust treatment, comprising the following steps: Step 1: Mix polyvinyl alcohol, aluminum nitrate and lanthanum nitrate in a mass ratio of 0.2-0.4:1:0.050-0.052, stir until completely dissolved, adjust the pH to 8.5-8.6 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 480-500℃ for 4-4.5 hours, then calcine at 1050-1100℃ for 32-34 hours to obtain modified alumina. Step 2: Add the carrier and modified alumina to a ball mill for ball milling. After mixing completely, dry and calcinate to obtain the pretreated carrier with the load coating. Step 3: The pretreated support is impregnated in a solution of noble metal precursor. After impregnation, it is dried and calcined to obtain the catalyst.
[0007] As a further embodiment of the present invention, the loading of modified alumina in step 2 is 20-40 g / L, and the loading of noble metal in step 3 is 0.2-0.3 g / L.
[0008] As a further aspect of the present invention, the noble metal precursor solution in step 2 includes a noble metal soluble salt corresponding to the noble metal, wherein the noble metal soluble salt includes at least one of noble metal chloride, noble metal sulfate and noble metal carbonate.
[0009] As a further aspect of the present invention, the precious metal mentioned in step 2 is at least one of platinum, palladium, and rhodium.
[0010] As a further embodiment of the present invention, the soluble salt corresponding to the platinum metal in step 2 is one of chloroplatinic acid, potassium chloroplatinate, platinum sulfate, and platinum carbonate; the soluble salt corresponding to the palladium metal is one of palladium chloride, chloropalladium acid, and potassium chloropalladium; and the soluble salt corresponding to the rhodium metal is one of rhodium chloride, rhodium chloroacid, and potassium rhodium chloroacid.
[0011] As a further embodiment of the present invention, the carrier in step 2 is prepared by the following steps: S1. Mix quartz sand, calcium carbonate and pseudoboehmite until uniform to obtain mixed powder; add the mixed powder to a pelletizing machine, then add pore-forming agent and binder, continue stirring until the mixed powder forms spherical particles, pass through a 6-10 mesh sieve, and dry naturally to form ceramic balls; S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls are then mixed with flux and sintered to obtain the carrier.
[0012] In the above technical solution, quartz sand, calcium carbonate, and boehmite are used as raw materials. By adding pore-forming agents and binders, porous ceramic balls are formed and sintered to serve as catalyst carriers. By reasonably controlling the amount of quartz sand, calcium carbonate, and boehmite, calcium carbonate decomposes into calcium oxide during the sintering process. Under the action of flux at high temperature, it melts with silica and alumina into a liquid phase, thereby filling some of the pores caused by particle accumulation, making the surface of the porous ceramic balls more dense, and thus improving the mechanical strength of the carrier.
[0013] As a further embodiment of the present invention, the weight ratio of quartz sand, calcium carbonate and pseudoboehmite in S1 is 55-60:10-30:10-20.
[0014] As a further aspect of the present invention, the pore-forming agent in S1 is obtained by mixing carbon powder and starch in a weight ratio of 1:1, wherein the amount of pore-forming agent is 5% to 10% of the mixture. Starch particles have high sphericity, which is conducive to the formation of window pores, while carbon powder is in the form of flakes or irregular particles, which can open up independent pores. The combination of the two to form pores in synergy can effectively improve the porosity of the carrier, thereby increasing the specific surface area and further improving the loading of active components.
[0015] As a further embodiment of the present invention, the binder in S1 is one of carboxymethyl cellulose and polyvinyl alcohol, wherein the amount of binder is 5% to 8% of the mass of the mixture.
[0016] As a further aspect of the present invention, the flux in S2 is zinc borate, wherein the amount of flux used is 3% to 6% of the mass of the dried ceramic balls.
[0017] The second aspect of the present invention provides a catalyst for automobile exhaust treatment obtained by the preparation method described in the first aspect above.
[0018] The beneficial effects of this invention are: (1) The present invention provides a catalyst for treating automobile exhaust gas, which is composed of an active component, a support and a modified alumina coating. The present invention increases the specific surface area of the support and the adhesion to the active component by loading modified alumina on the support, and then loading precious metals on the support. Through the above method, the catalytic performance and service life of the catalyst are significantly improved.
[0019] (2) This invention provides a modified alumina, in which lanthanum is added to the alumina using a sol-gel method, along with polyvinyl alcohol. The addition of both polyvinyl alcohol and lanthanum significantly increases the specific surface area of the alumina, increases the total pore volume and average pore size, improves its surface properties, and is more conducive to maintaining better thermal stability, thus facilitating heat and mass transfer. Simultaneously, the addition of polyvinyl alcohol inhibits the growth of alumina grains, improves the alumina's resistance to sintering and thermal stability, and helps reduce the enrichment of lanthanum on the alumina surface. Furthermore, loading the modified alumina onto a support effectively increases the specific surface area of the support and improves the adhesion between the support and the active component, allowing the active component to be firmly adsorbed into the micropores of the support, greatly improving the catalytic activity and reaction time of the catalyst.
[0020] (3) The present invention also provides a carrier, which is prepared by mixing quartz sand, calcium carbonate and boehmite, molding and sintering, and has a high specific surface area, so that the active components of the catalyst and the co-catalyst can be loaded on the surface and inside of the carrier. The large specific surface area of the carrier is conducive to the high dispersion of the active components and the co-catalyst, increasing the contact area between the exhaust gas and the catalyst, thereby effectively improving the utilization rate of the active components and the co-catalyst; the carrier also has excellent high temperature resistance and mechanical properties, so that the catalyst can withstand the continuous scouring of high temperature corrosive hot air flow and the severe vibration caused by uneven road surface and cylinder vibration, effectively extending the service life of the catalyst.
[0021] (4) The present invention provides a method for preparing a catalyst for automobile exhaust treatment, which is simple in process, easy to operate, and easy to industrialize. The prepared catalyst exhibits good catalytic performance when used for the purification treatment of automobile exhaust. Detailed Implementation
[0022] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Example
[0024] Example 1
[0025] This embodiment provides a catalyst for automotive exhaust gas treatment and its preparation method: Step 1: Mix polyvinyl alcohol, aluminum nitrate and lanthanum nitrate in a mass ratio of 0.2:1:0.050, stir until completely dissolved, adjust the pH to 8.5 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 480℃ for 4 hours, and then calcine at 1050℃ for 32 hours to obtain modified alumina. Step 2: Add the carrier and modified alumina to a ball mill for ball milling. The loading of modified alumina is 20 g / L. After mixing completely, dry and calcine to obtain the pretreated carrier with the loaded coating. In step 2, the carrier is prepared through the following steps: S1. Mix quartz sand, calcium carbonate, and pseudoboehmite in a weight ratio of 55:10:10 and stir until uniform to obtain a mixed powder. Add the mixed powder to a pelletizing machine, then add a pore-forming agent (carbon powder and starch mixed in a weight ratio of 1:1) and carboxymethyl cellulose. The amount of pore-forming agent is 5% of the mixture, and the amount of binder is 5% of the mixture mass. Continue stirring until the mixed powder forms spherical particles, pass through a 6-mesh sieve, and air dry to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls and zinc borate are then mixed, with the amount of flux being 3% of the mass of the dried ceramic balls, and sintered to obtain the carrier. Step 3: The pretreated support is impregnated in chloroplatinic acid solution with a platinum metal loading of 0.2 g / L. After impregnation, the support is dried and calcined to obtain the catalyst.
[0026] A catalyst for treating automobile exhaust gas is prepared by the above-described preparation method.
[0027] Example 2
[0028] The only difference from Example 1 is that: Step 1: Mix polyvinyl alcohol, aluminum nitrate and lanthanum nitrate in a mass ratio of 0.4:1:0.052 and stir until completely dissolved. Adjust the pH to 8.5 with dilute ammonia water, filter, wash and dry, and then calcine. First, pre-calcine at 480℃ for 4 hours, and then calcine at 1050℃ for 32 hours to obtain modified alumina.
[0029] Example 3
[0030] The only difference from Example 1 is that: Step 1: Mix polyvinyl alcohol, aluminum nitrate and lanthanum nitrate in a mass ratio of 0.2:1:0.050, stir until completely dissolved, adjust the pH to 8.5 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 500℃ for 4.5h, and then calcine at 1100℃ for 34h to obtain modified alumina.
[0031] Example 4
[0032] The only difference from Example 1 is that: Step 2: Add the carrier and modified alumina to a ball mill for ball milling. The loading of modified alumina is 30 g / L. After complete mixing, dry and calcine to obtain the pretreated carrier with the loaded coating.
[0033] Example 5
[0034] The only difference from Example 1 is that: Step 2: Add the carrier and modified alumina to a ball mill for ball milling. The loading of modified alumina is 40 g / L. After complete mixing, dry and calcine to obtain the pretreated carrier with the loaded coating.
[0035] Example 6
[0036] The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Quartz sand, calcium carbonate, and pseudoboehmite are mixed in a weight ratio of 60:30:20 and stirred until uniform to obtain a mixed powder. The mixed powder is added to a pelletizing machine, and then a pore-forming agent (carbon powder and starch are mixed in a weight ratio of 1:1) and carboxymethyl cellulose are added. The amount of pore-forming agent is 8% of the mixture, and the amount of binder is 7% of the mixture mass. Stirring continues until the mixed powder forms spherical particles. The particles are then passed through a 10-mesh sieve and naturally dried to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls and zinc borate are then mixed, with the amount of flux being 3% of the mass of the dried ceramic balls, and sintered to obtain the carrier.
[0037] Example 7
[0038] The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Quartz sand, calcium carbonate, and pseudoboehmite are mixed in a weight ratio of 58:20:15 and stirred until uniform to obtain a mixed powder. The mixed powder is added to a pelletizing machine, and then a pore-forming agent (carbon powder and starch are mixed in a weight ratio of 1:1) and polyvinyl alcohol are added. The amount of pore-forming agent is 5% of the mixture, and the amount of binder is 5% of the mass of the mixture. Stirring continues until the mixed powder forms spherical particles. The particles are then passed through an 8-mesh sieve and naturally dried to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls are then mixed with zinc borate, with the amount of flux being 5.5% of the mass of the dried ceramic balls, and sintered to obtain the carrier.
[0039] Example 8
[0040] The only difference from Example 1 is that: Step 3: The pretreated support is impregnated in chloroplatinic acid solution with a platinum metal loading of 0.25 g / L. After impregnation, the support is dried and calcined to obtain the catalyst.
[0041] Example 9
[0042] The only difference from Example 1 is that: Step 3: The pretreated support is impregnated in chloroplatinic acid solution with a platinum metal loading of 0.3 g / L. After impregnation, the support is dried and calcined to obtain the catalyst.
[0043] Comparative Example
[0044] Comparative Example 1
[0045] The only difference from Example 1 is that: Step 1: Mix polyvinyl alcohol and aluminum nitrate at a mass ratio of 0.2:1, stir until completely dissolved, adjust the pH to 8.5 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 480℃ for 4 hours, and then calcine at 1050℃ for 32 hours to obtain modified alumina.
[0046] Comparative Example 2
[0047] The only difference from Example 1 is that: Step 1: Mix aluminum nitrate and lanthanum nitrate at a mass ratio of 1:0.050, stir until completely dissolved, adjust the pH to 8.5 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 480℃ for 4 hours, and then calcine at 1050℃ for 32 hours to obtain modified alumina.
[0048] Comparative Example 3
[0049] The only difference from Example 1 is that: Step 2: Add the carrier and modified alumina to a ball mill for ball milling. The loading of modified alumina is 15 g / L. After complete mixing, dry and calcine to obtain the pretreated carrier with the loaded coating.
[0050] Comparative Example 4
[0051] The only difference from Example 1 is that: Step 2: Add the carrier and modified alumina to a ball mill for ball milling. The loading of modified alumina is 48 g / L. After complete mixing, dry and calcine to obtain the pretreated carrier with the loaded coating. Comparative Example 5 The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Quartz sand, calcium carbonate, and pseudoboehmite are mixed in a weight ratio of 45:10:10 and stirred until uniform to obtain a mixed powder. The mixed powder is added to a pelletizing machine, and then a pore-forming agent (carbon powder and starch are mixed in a weight ratio of 1:1) and carboxymethyl cellulose are added. The amount of pore-forming agent is 5% of the mixture, and the amount of binder is 5% of the mass of the mixture. Stirring continues until the mixed powder forms spherical particles. The particles are then passed through a 6-mesh sieve and naturally dried to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls and zinc borate are then mixed, with the amount of flux being 3% of the mass of the dried ceramic balls, and sintered to obtain the carrier.
[0052] Comparative Example 6
[0053] The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Mix quartz sand, calcium carbonate, and pseudoboehmite in a weight ratio of 45:10:10 and stir until uniform to obtain a mixed powder. Add the mixed powder to a pelletizing machine, then add a pore-forming agent (carbon powder) and carboxymethyl cellulose. The amount of pore-forming agent is 5% of the mixture, and the amount of binder is 5% of the mixture mass. Continue stirring until the mixed powder forms spherical particles, pass through a 6-mesh sieve, and dry naturally to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls and zinc borate are then mixed, with the amount of flux being 3% of the mass of the dried ceramic balls, and sintered to obtain the carrier.
[0054] Comparative Example 7
[0055] The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Quartz sand, calcium carbonate, and pseudoboehmite are mixed in a weight ratio of 55:10:10 and stirred until uniform to obtain a mixed powder. The mixed powder is added to a pelletizing machine, and then a pore-forming agent (carbon powder and starch are mixed in a weight ratio of 1:1) and carboxymethyl cellulose are added. The amount of pore-forming agent is 3% of the mixture, and the amount of binder is 3% of the mass of the mixture. Stirring continues until the mixed powder forms spherical particles. The particles are then passed through a 6-mesh sieve and naturally dried to form ceramic balls. S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls and zinc borate are then mixed, with the amount of flux being 3% of the mass of the dried ceramic balls, and sintered to obtain the carrier.
[0056] Comparative Example 8
[0057] The only difference from Example 1 is that: The carrier in step 2 is prepared through the following steps: S1. Mix quartz sand, calcium carbonate, and pseudoboehmite in a weight ratio of 55:10:10 and stir until uniform to obtain a mixed powder. Add the mixed powder to a pelletizing machine, then add a pore-forming agent (carbon powder and starch mixed in a weight ratio of 1:1) and carboxymethyl cellulose. The amount of pore-forming agent is 5% of the mixture, and the amount of binder is 5% of the mixture mass. Continue stirring until the mixed powder forms spherical particles, pass through a 6-mesh sieve, and air dry to form ceramic balls. S2. The naturally dried ceramic balls are then dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during the calcination process. The dried ceramic balls are then sintered to obtain the carrier.
[0058] Comparative Example 9
[0059] The only difference from Example 1 is that: Step 3: The pretreated support is impregnated in chloroplatinic acid solution with a platinum metal loading of 0.15 g / L. After impregnation, the support is dried and calcined to obtain the catalyst.
[0060] Comparative Example 10
[0061] The only difference from Example 1 is that: Step 3: The pretreated support is impregnated in chloroplatinic acid solution with a platinum metal loading of 0.37 g / L. After impregnation, the support is dried and calcined to obtain the catalyst.
[0062] Performance testing
[0063] The catalysts prepared in Examples 1-9 and Comparative Examples 1-10 were tested for their automotive exhaust performance. Automotive exhaust was passed into fixed-bed reactors containing the catalyst materials prepared in the examples and comparative examples, respectively, and reacted at 200°C and 900°C for 30 minutes, respectively, to complete the automotive exhaust treatment. The results of the automotive exhaust treatment performance tests are shown in Table 1. Table 1
[0064] As shown in Table 1, compared to Comparative Examples 1-10, the catalysts prepared in Examples 1-9 can catalytically degrade gaseous pollutants in automobile exhaust and exhibit excellent high-temperature resistance at higher temperatures. Furthermore, combining the data from Comparative Examples 1-10 with those in Table 1, it can be seen that different process parameters affect the catalytic activity and high-temperature resistance of the catalysts during preparation.
[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A method for preparing a catalyst for automobile exhaust treatment, characterized in that, Includes the following steps: Step 1: Mix polyvinyl alcohol, aluminum nitrate and lanthanum nitrate in a mass ratio of 0.2-0.4:1:0.050-0.052, stir until completely dissolved, adjust the pH to 8.5-8.6 with dilute ammonia, filter, wash and dry, and then calcine. First, pre-calcine at 480-500℃ for 4-4.5 hours, then calcine at 1050-1100℃ for 32-34 hours to obtain modified alumina. Step 2: Add the carrier and modified alumina to a ball mill for ball milling. After mixing completely, dry and calcinate to obtain the pretreated carrier with the load coating. Step 3: The pretreated support is impregnated in a solution of noble metal precursor. After impregnation, it is dried and calcined to obtain the catalyst.
2. The method for preparing a catalyst for automobile exhaust treatment according to claim 1, characterized in that, In step 2, the loading of modified alumina is 20–40 g / L, and in step 3, the loading of precious metals is 0.2–0.3 g / L.
3. The method for preparing a catalyst for automobile exhaust treatment according to claim 1, characterized in that, The noble metal precursor solution in step 2 includes a noble metal soluble salt corresponding to the noble metal, and the noble metal soluble salt includes at least one of noble metal chloride, noble metal sulfate and noble metal carbonate.
4. The method for preparing a catalyst for automobile exhaust treatment according to claim 1, characterized in that, The precious metal mentioned in step 2 is at least one of platinum, palladium, and rhodium.
5. The method for preparing a catalyst for automobile exhaust treatment according to claim 1, characterized in that, The carrier described in step 2 is prepared through the following steps: S1. Mix quartz sand, calcium carbonate and pseudoboehmite until uniform to obtain mixed powder; add the mixed powder to a pelletizing machine, then add pore-forming agent and binder, continue stirring until the mixed powder forms spherical particles, pass through a 6-10 mesh sieve, and dry naturally to form ceramic balls; S2. The naturally dried ceramic balls are dried to remove free water from the ceramic balls, increase the strength of the ceramic balls and prevent cracking during calcination. The dried ceramic balls are then mixed with flux and sintered to obtain the carrier.
6. The method for preparing a catalyst for automobile exhaust treatment according to claim 5, characterized in that, The weight ratio of quartz sand, calcium carbonate and pseudoboehmite in S1 is 55-60:10-30:10-20.
7. The method for preparing a catalyst for automobile exhaust treatment according to claim 5, characterized in that, The pore-forming agent mentioned in S1 is obtained by mixing carbon powder and starch in a weight ratio of 1:1, wherein the amount of pore-forming agent is 5% to 10% of the mixture.
8. The method for preparing a catalyst for automobile exhaust treatment according to claim 5, characterized in that, The binder mentioned in S1 is one of carboxymethyl cellulose and polyvinyl alcohol, wherein the amount of binder is 5% to 8% of the mass of the mixture.
9. The method for preparing a catalyst for automobile exhaust treatment according to claim 5, characterized in that, The flux mentioned in S2 is zinc borate, and the amount of flux used is 3% to 6% of the mass of the dried ceramic balls.
10. A catalyst for treating automobile exhaust gases, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 9.