Single-coat three-way catalyst and preparation method thereof
A three-way catalyst, single-coating technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of high price, uneven distribution of precious metal particles, easy sintering, etc. Achieve the effect of improving the dispersion of precious metals, large market application value, and reducing preparation costs
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Embodiment 1
[0031] A kind of preparation method of single coating three-way catalyst comprises the steps:
[0032] 1. Preparation of Rh / CeZrLaOx powder:
[0033] (1), the cerium nitrate hexahydrate crystal that takes 40 weight parts is dissolved in the deionized water of 150 weight part, stirs 5 minutes to all crystals dissolve;
[0034] (2), take by weighing the zirconium acetate solution that contains 200 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;
[0035] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 5 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;
[0036] (4), weigh 1.70 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes colloidal, and continue stirring for 5 hours ;
[0037] (5), the colloid prepared in step ...
Embodiment 2
[0046] A kind of preparation method of single coating three-way catalyst comprises the steps:
[0047] 1. Rh / CeZrLaO x Preparation of powder:
[0048] (1), the cerium nitrate hexahydrate crystal that takes 60 weight parts is dissolved in the deionized water of 160 weight part, stirs 5 minutes until all crystals dissolve;
[0049](2), take by weighing the zirconium acetate solution that contains 180 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;
[0050] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 9 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;
[0051] (4), weigh 1.37 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes colloidal, and continue stirring for 3 hours ;
[0052] (5), the colloid prepared in s...
Embodiment 3
[0061] A kind of preparation method of single coating three-way catalyst comprises the steps:
[0062] 1. Rh / CeZrLaO x Preparation of powder:
[0063] (1), take 80 weight parts of cerium nitrate hexahydrate crystals and dissolve them in 170 weight parts of deionized water, stir for 5 minutes until all crystals dissolve;
[0064] (2), take by weighing the zirconium acetate solution that contains 160 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;
[0065] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 14 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;
[0066] (4), weigh 1.17 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes a colloid, and continue stirring for 4 hours ;
[0067] (5), the colloid prepared in ...
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