Exhaust gas purging catalyst and method for producing the exhaust gas purging catalyst
A technology of exhaust gas purification and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve the problem of impossible diffusion of exhaust gas
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[0046] Preparation method of exhaust gas purification catalyst
[0047] Next, a method for producing the exhaust gas purification catalyst 3 of the present invention will be described.
[0048] A slurry containing i) the catalyst component 4A and ii) activated carbon having an average particle diameter of 1.0 μm or less was prepared, and then coated on the integrated carrier 5, followed by sintering.
[0049] In the present application, activated carbon having an average particle diameter of 1.0 μm or less is intended to form pores 7 having a pore diameter of 0.1 μm to 1.0 μm in the catalyst coating layer 4 . The average particle size of activated carbon greater than 1.0 μm makes the pores 7 in the catalyst coating 4 too large, resulting in reduced physical strength such as catalyst coating 4 peeling off, etc., resulting in reduced durability of the catalyst coating 4 .
[0050] In the present application, there is no particular limitation on the sintering temperature, and ex...
Embodiment 1
[0055] Polyvinylpyrrolidone and dinitrodiamine platinum were put into a mixed dispersion solution comprising water:ethanol=1:1 (weight ratio), followed by stirring. Then, hydrazine was added thereto for reduction, thereby preparing a Pt microparticle dispersion liquid having an average particle diameter of 2.1 nm.
[0056] Aluminum isopropoxide (hereinafter abbreviated as "AIP") was dissolved in 2-methyl-2,4-pentanediol, followed by heating and stirring at 120°C. Then cerium acetylacetonate (acetyl acetonate cerium, hereinafter referred to as "AAC") was put in, followed by heating and stirring.
[0057] The above Pt microparticle dispersion liquid was added to the thus obtained solution, followed by hydrolysis. Then, the gel thus obtained was subjected to decompression drying at 150°C, followed by sintering at 300°C for 1 hour and further sintering at 400°C for 1 hour, thereby preparing Pt(0.3%) / CeO 2 (20%) / Al 2 o 3 powder (powder a).
[0058] Further, an aqueous solution...
Embodiment 2
[0061] The powder a obtained in Example 1 was impregnated with an aqueous solution of manganese nitrate. The product thus obtained was then dried at 120°C overnight, followed by sintering at 400°C for 1 hour to obtain a Pt(0.3%) / Mn(5%)CeO 2 (20%) / Al 2 o 3 powder (powder a1).
[0062] The operation similar to that of Example 1 was repeated, except that powder a1 was used instead of powder a, thereby preparing an exhaust gas purification catalyst.
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