Ammoxidation catalyst for diesel engine exhaust gas purification system and preparation method thereof
A tail gas purification and ammonia oxidation technology, which is applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of high selectivity, and achieve the effects of simple preparation method, reduced ammonia slip, and high N2 selectivity
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[0029] Example 1
[0030] The catalyst is composed of a carrier and a coating. The coating is loaded with precious metal platinum. The coating amount of the coating is 120g / L. The loading amount of the precious metal platinum is 0.15g / L. The catalyst carrier is a cordierite ceramic carrier with a volume of 1.236L. The pore density is 400 mesh / square inch; the coating contains cerium-zirconium-aluminum composite oxide and β molecular sieve.
[0031] The ammonia oxidation catalyst used in diesel engine exhaust purification system includes the following steps:
[0032] (1) Preparation of composite oxide cerium-zirconium-aluminum: First, prepare the cerium-aluminum composite oxide according to the mass ratio of cerium oxide and alumina of 1:9, and then press the cerium-aluminum composite oxide into equal volume The cerium-zirconium-aluminum composite oxide is prepared by the dipping method; the zirconyl nitrate solution is prepared according to the saturated adsorption amount of the cer...
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[0037] Example 2
[0038] The specific preparation method and activity test are basically the same as in Example 1, except that titanium-cerium-aluminum composite oxide prepared by using titanyl sulfate instead of zirconyl nitrate. In the titanium-cerium-aluminum composite oxide, the mass ratio of titanium oxide to the cerium-aluminum composite oxide is 1:7.
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[0039] Example 3
[0040] The specific preparation method and activity test are basically the same as in Example 1, except that the composite oxide is a cerium-silicon-aluminum composite oxide. The cerium-silicon-aluminum composite oxide is prepared by impregnating the silicon-aluminum composite oxide with a cerium nitrate solution. In the silicon-aluminum composite oxide, the mass ratio of silicon oxide to aluminum oxide is 1:19. In the cerium-silicon-aluminum composite oxide, the mass ratio of cerium oxide to the silicon-aluminum composite oxide is 1:9.
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