A low-concentration nitrogen oxide elimination catalyst and its preparation and application
A technology for nitrogen oxides and catalysts, which is applied in the field of low-concentration nitrogen oxides elimination catalysts and their preparation and application fields, can solve the problems of high operating costs, harm of low-concentration nitrogen oxides, secondary pollution, etc., and achieves no secondary pollution. , low cost, high elimination rate
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Embodiment 1
[0046] Preparation and activity test of embodiment 1 copper manganese oxide
[0047]Weigh a certain amount of copper nitrate trihydrate and manganese nitrate and dissolve them in water (the concentrations are 0.1mol / L and 0.2mol / L respectively), and the mixed solution is added dropwise to 1.0mol / L tetramethylammonium hydroxide The solution was completely precipitated, stirred for half an hour and left to age for 12 hours before filtering. The resulting precipitate was washed several times with ultrapure water and absolute ethanol, and then dried in an oven at 100°C for 24 hours, and then calcined in a muffle furnace at 400°C for 5 hours to obtain a spinel-type copper-manganese oxide catalyst.
[0048] Weigh 0.30 g of the above-mentioned catalyst with a particle size of 40-60 mesh, and place it in a stainless steel reactor with an inner diameter of 7 mm and a length of 300 mm. The tubular reactor is placed in an electric furnace and heated to the required temperature, and its ...
Embodiment 2
[0049] Example 2 Copper-manganese catalyst modified by 5% potassium hydroxide impregnation treatment and activity test
[0050] After the copper manganese oxide prepared in Example 1 was impregnated with 5% potassium hydroxide, the supernatant was removed by centrifugation, and the obtained precipitate was dried in an oven at 100°C.
[0051] Weigh 0.30 g of the above-mentioned catalyst with a particle size of 40-60 mesh, and place it in a stainless steel reactor with an inner diameter of 7 mm and a length of 300 mm. The tubular reactor is placed in an electric furnace and heated to the required temperature, and its temperature is controlled by a calibrated K-type thermocouple and an AI-708P intelligent program controller. After the temperature is stabilized, 7.2ppm of NO reaction gas is introduced, and the rest is the clean air provided by the chromatographic air source, with a space velocity of 140000mL·g -1 h -1 . It is found that the catalyst can effectively remove NO, a...
Embodiment 3
[0052] Example 3 Copper-manganese catalyst modified by 10% potassium hydroxide impregnation treatment and activity test
[0053] After the copper manganese oxide prepared in Example 1 was impregnated with 10% potassium hydroxide, the supernatant was removed by centrifugation, and the obtained precipitate was dried in an oven at 100°C.
[0054] Weigh 0.30 g of the above-mentioned catalyst with a particle size of 40-60 mesh, and place it in a stainless steel reactor with an inner diameter of 7 mm and a length of 300 mm. The tubular reactor is placed in an electric furnace and heated to the required temperature, and its temperature is controlled by a calibrated K-type thermocouple and an AI-708P intelligent program controller. After the temperature is stabilized, 7.2ppm of NO reaction gas is introduced, and the rest is the clean air provided by the chromatographic air source, with a space velocity of 140000mL·g -1 h -1 . It is found that the catalyst can effectively eliminate ...
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