Catalyst for selectively catalytically reducing nitrogen-oxygen compound by using propane under oxygen-enriched condition
A technology of nitrogen oxides and selectivity, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve problems such as narrow operating window, achieve wide operating window, high purification performance of nitrogen oxides, and good repeatability Effect
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[0016] [Example 1]
[0017] Weigh 0.235g silver nitrate dissolved in deionized water, and then add 3g containing 5% TiO 2 Al 2 O 3 Soak it at 20℃ for 6 hours, then put it in an oven at 110℃ and dry it for 24 hours. After drying, put it in a muffle furnace and roast it at 600℃ for 5 hours to prepare 5% Ag / TiO 2 -Al 2 O 3 catalyst.
[0018] Activity test: using a fixed bed reactor, reaction gas composition: NO = 450ppm, C 3 H 8 = 900ppm, O 2 = 7%, Ar is used as balance gas. Total flow rate of reactant gas 320 cm 3 / min. The HC-SCR activity on the catalyst was tested in the temperature range of 200 ~ 600 ℃. Use Model 42i-HS NOx concentration analyzer (Thermo-Scientific) to detect the conversion rate of NOx and FULI 9790 chromatogram (Zhejiang Fuli Analytical Instrument Co., Ltd.) to detect C 3 H 8 Conversion rate.
Example Embodiment
[0019] [Example 2]
[0020] Adding additives in Example 1, dissolve silver nitrate and samarium nitrate in deionized water at the same time (Sm weight content is 0.5%), and the other steps are the same to obtain 5% Ag / 0.5% Sm 2 O 3 / TiO 2 -Al 2 O 3 catalyst.
Example Embodiment
[0021] [Example 3]
[0022] Adding additives in Example 1, dissolve silver nitrate and samarium nitrate in deionized water at the same time (Sm weight content is 1%), and the other steps are the same to obtain 5% Ag / 1% Sm 2 O 3 / TiO 2 -Al 2 O 3 catalyst.
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