Automobile exhaust purifying catalyst and preparation method thereof
A technology for purifying catalysts and automobile exhaust. It is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve the problems of poor high-temperature anti-aging performance and high ignition temperature, and achieve excellent aging resistance. Satisfies emission requirements and has good low-temperature ignition activity
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[0025] The preparation method of the above-mentioned catalyst provided by the embodiment of the present invention includes the following steps:
[0026] (1) Load the oxygen storage material with a soluble rhodium salt solution in a manner of impregnation, and dry and roast to obtain a rhodium modified oxygen storage material;
[0027] (2) Load in activated alumina by impregnation with palladium soluble salt solution, dry and roast to obtain palladium modified alumina;
[0028] (3) Ball mill the prepared rhodium-modified oxygen storage material and palladium-modified alumina, respectively, with water and a binder to a thickness of 1-10 μm to prepare the first layer and the second layer coating slurry;
[0029] (4) The first layer and the second layer coating slurry are sequentially coated on the catalyst carrier, dried and calcined to obtain the catalyst.
[0030] In the preparation method provided by the present invention, the drying steps are all carried out at 85-130°C, and the ...
Example Embodiment
[0036] Example 1
[0037] This embodiment is used to illustrate the automobile exhaust purification catalyst provided by the present invention and the preparation method thereof.
[0038] 60g of cerium-zirconium solid solution was impregnated with a rhodium trichloride solution containing 0.15g of rhodium. The cerium-zirconium solid solution was in parts by weight, in which Ce:Zr=4:6, and then dried at 100°C for 6h and roasted at 600°C for 2h to prepare rhodium Oxygen storage material: 100g activated alumina is impregnated with 1.2g palladium chloride hydrochloric acid solution containing palladium, and then dried at 100°C for 6 hours and calcined at 600°C for 2 hours to prepare palladium-modified alumina. Mix 60g of rhodium-modified oxygen storage material, 80g of activated alumina, 20g of pseudo-boehmite and 200g of water to 3μm to form an inner coating slurry; 100g of palladium-modified alumina, 30g of oxygen storage material, pseudo-boehmite 30 g of boehmite and 180 g of water...
Example Embodiment
[0039] Example 2
[0040] This example is used to illustrate the automobile exhaust gas purification catalyst provided by the present invention and its preparation method.
[0041] 80g of cerium-zirconium solid solution was impregnated with 0.2g rhodium trichloride solution containing La in parts by weight, where Ce:Zr:La=3:6:1, and then dried at 110°C for 4h, 550 The rhodium-modified oxygen storage material was calcined at °C for 4 hours to prepare the rhodium-modified oxygen storage material; 120 g of activated alumina was impregnated with a palladium chloride hydrochloric acid solution containing 2 g of palladium, and then dried at 110 °C for 4 hours and calcined at 550 °C for 4 hours to prepare palladium-modified alumina. The rhodium-modified oxygen storage material 80g, activated alumina 80g, pseudo-boehmite 20g, barium nitrate 10g and water 220g are mixed and ball milled to 3μm to make the inner coating slurry; 120g palladium-modified alumina, oxygen storage 30 g of materials...
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