SCR (selective catalytic reduction) catalyst and preparation method thereof
A technology of SCR catalyst and high-temperature activation, which is applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as narrow operating temperature window, threat to human health, poor selectivity, etc., and achieve stable selectivity and catalytic Good effect and high selectivity
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Embodiment 1
[0028] The activated carbon carrier was placed in a muffle furnace at 500°C for high-temperature activation, and the activation time was 3 hours; the MnO 2 and WO 3 The soluble salt of the solution is made into a solution, and then the activated carbon is put into the active component solution for impregnation. When impregnated, the ratio of the mass of activated carbon to the volume of the active component solution is 1:4; after 20 hours of immersion, the activated carbon and activated carbon The components were activated in a microwave oven at 500W for 6 minutes, and then the activated carbon was put in a muffle furnace and calcined at 600° C. for 3 hours to obtain the SCR catalyst.
[0029] The catalyst prepared above was tested for activity on a catalyst activity evaluation device. The test conditions were: temperature 200-400°C, reaction gas simulated motor vehicle exhaust, and reaction space velocity 40000h -1 , the results show that in the temperature range of 200-400 ...
Embodiment 2
[0031] The activated carbon carrier was placed in a muffle furnace at 700°C for high-temperature activation, and the activation time was 2 hours; the MnO 2 and MoO 3 The soluble salt of the solution is made into a solution, and then the activated carbon is put into the active component solution for impregnation. When impregnated, the ratio of the mass of activated carbon to the volume of the active component solution is 1:4; after immersion for 15 hours, the activated carbon and activated The components were activated in a microwave oven at 350W for 6 minutes, and then activated carbon was placed in a muffle furnace and calcined at 670° C. for 3 hours to obtain the SCR catalyst.
[0032] The catalyst prepared above was tested for activity on a catalyst activity evaluation device. The test conditions were: temperature 200-400°C, reaction gas simulated motor vehicle exhaust, and reaction space velocity 40000h -1 , the results show that in the temperature range of 200-400 °C, NO...
Embodiment 3
[0034] The activated carbon carrier was placed in a muffle furnace at 600°C for high-temperature activation, and the activation time was 2 hours; the MoO 3 and WO 3 The soluble salt of the solution is made into a solution, and then the activated carbon is put into the active component solution for impregnation. When impregnated, the ratio of the mass of activated carbon to the volume of the active component solution is 1:4; after 20 hours of immersion, the activated carbon and activated carbon The components were activated in a microwave oven at 400W for 8 minutes, and then activated carbon was put in a muffle furnace and calcined at 650° C. for 3 hours to obtain the SCR catalyst.
[0035] The catalyst prepared above was tested for activity on a catalyst activity evaluation device. The test conditions were: temperature 200-400°C, reaction gas simulated motor vehicle exhaust, and reaction space velocity 40000h -1 , the results show that in the temperature range of 200-400 °C, ...
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