A kind of preparation method of diesel engine oxidation catalyst
An oxidation catalyst and diesel engine technology, which is applied in the field of automobile exhaust purification and diesel engine exhaust catalytic purification, can solve the problems of large amount of catalyst noble metal, high light-off temperature, low catalyst light-off temperature, etc., and achieve simple and easy preparation process and low cost. Combustion temperature, easy process control effect
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Embodiment 1
[0021] Add 1.63g of citric acid and 0.52g of ethylene glycol into 100.0g of deionized water and stir to dissolve at 45-55°C, add 2.45g of platinum nitrate aqueous solution (the concentration of platinum is 15%) to the above solution After stirring for 1 hour, a mixed solution was obtained. Then add 100.0g of alumina powder with a particle size of 100 to 200 mesh (the mass ratio of α-alumina to γ-alumina in the alumina powder is 1:3) into the above mixed solution, Stir at room temperature for 0.5 to 1 hour at a constant stirring speed, then heat to 70° C. and stir for 7 hours until evaporated to dryness. Finally, the evaporated product was dried at 100°C for 3 hours, and then calcined at 500°C and 0.3-0.5MPa nitrogen atmosphere for 2 hours to obtain a diesel oxidation catalyst (DOC).
Embodiment 2
[0023] Add 1.77g of citric acid and 1.14g of ethylene glycol into 100.0g of deionized water and stir to dissolve at 45-55°C, add 3.26g of platinum nitrate aqueous solution (the concentration of platinum is 15%) to the above solution After stirring for 1 hour, a mixed solution was obtained. Then add 100.0g of alumina powder with a particle size of 100 to 200 mesh (the mass ratio of α-alumina to γ-alumina in the alumina powder is 1:3) into the above mixed solution, Stir at room temperature for 0.5 to 1 hour at a constant stirring speed, then heat to 80° C. and stir for 8 hours until evaporated to dryness. Finally, the evaporated product was dried at 110°C for 4 hours, and then calcined at 550°C and 0.3-0.5MPa nitrogen atmosphere for 3 hours to obtain a diesel oxidation catalyst (DOC).
Embodiment 3
[0025] Add 1.96g of citric acid and 1.89g of ethylene glycol into 100.0g of deionized water and stir to dissolve at 45-55°C. After stirring for 1 hour, a mixed solution was obtained. Then add 100.0g of alumina powder with a particle size of 100 to 200 mesh (the mass ratio of α-alumina to γ-alumina in the alumina powder is 1:3) into the above mixed solution, Stir at room temperature for 0.5 to 1 hour at a constant stirring speed, then heat to 90° C. and stir for 6 hours until evaporated to dryness. Finally, the evaporated product was dried at 120°C for 5 hours, and then calcined at 500°C and 0.3-0.5MPa nitrogen atmosphere for 2 hours to obtain a diesel oxidation catalyst (DOC).
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