A kind of preparation method of three-way catalyst
A three-way catalyst, zirconia technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of poor catalytic performance and poor stability of PTO, and achieve active redox The effect of good performance, lubricity and high hardness
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[0015] A kind of preparation method of three-way catalyst, it comprises the following steps:
[0016] First, mix zirconia, cerium oxide and nickel powder according to the mass fraction and ball mill for 30-50 hours, then add alumina and continue ball milling for 20-40 hours to obtain a composite powder, in which zirconia accounts for 4-8wt%, and cerium oxide accounts for 15-20wt% , nickel accounts for 2-4wt%, and the balance is alumina; in the ball milling process, the speed of 180-220r / min is used, and the ball-to-material ratio of (9-10):1 is used, so that nano-scale composite powder can be obtained. During the ball milling process, due to the stress-induced allotropic phase transition of alumina ball milling, the generated α-Al 2 o 3 It is not good for catalytic performance, so it should be milled after ball milling zirconia, cerium oxide and nickel powder; and nickel powder has a strong cold welding effect in the early stage of ball milling, so it should be mixed with zir...
Embodiment 1
[0020] Mix zirconia, cerium oxide and nickel powder according to the mass fraction, use the speed of 180r / min, ball-to-material ratio of 9:1 ball mill for 30h, then add alumina and continue the ball milling time for 20h to obtain a composite powder, in which zirconia accounts for 4wt% , cerium oxide accounts for 15wt%, nickel accounts for 2wt%, and the balance is alumina; then the composite powder is prepared into a slurry with deionized water, and then the pretreated cordierite carrier is immersed in the slurry, and taken out after about 1min. And blow off the excess slurry in the channel, after drying, immerse in the slurry for 1min, then dry at 130°C for 3h, and bake at 600°C for 1h; after the slurry is coated, immerse the carrier in 1g / L palladium chloride ammonia solution , magnetically stirred for 4 hours, then took it out, blown off the excess solution, dried in the air, dried at 120°C for 4h, and roasted at 500°C for 2h to obtain a catalyst with a palladium loading of 1...
Embodiment 2
[0022] Mix zirconia, cerium oxide and nickel powder according to the mass fraction, use the speed of 200r / min, ball-to-material ratio of 10:1 ball mill for 40h, then add alumina and continue the ball milling time for 30h to obtain a composite powder, in which zirconia accounts for 6wt% , cerium oxide accounts for 18wt%, nickel accounts for 3wt%, and the balance is alumina; then the composite powder is prepared into a slurry with deionized water, and then the pretreated cordierite carrier is immersed in the slurry, and taken out after about 1min. And blow off the excess slurry in the channel, after drying, immerse in the slurry for 1min, then dry at 130°C for 3h, and bake at 600°C for 1h; after the slurry is coated, immerse the carrier in 1g / L palladium chloride ammonia solution , magnetically stirred for 4 hours, then took it out, blown off the excess solution, dried in the air, dried at 120°C for 4h, and roasted at 500°C for 2h to obtain a catalyst with a palladium loading of ...
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