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Method for reducing nitrogen oxides in flue gases with an arsenic resistant catalyst
Method for reducing nitrogen oxides in flue gases with an arsenic resistant catalyst
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机译:用抗砷催化剂还原烟道气中氮氧化物的方法
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摘要
An arsenic-resistant composite oxide catalyst containing oxides of at least the metals vanadium and molybdenum, in particular for reducing nitrogen oxides in flue gases in the presence of a reducing agent, such as ammonia or carbon monoxide, includes at least one composite oxide phase with a general formula V.sub.x Mo.sub.y O.sub.32, where x+y≦ 12 and where x≧1 and y≧1, and optionally a MoO.sub.3 phase. A method for producing an arsenic-resistant composite oxide catalyst includes mixing vanadium oxide and molybdenum oxide or a precursor thereof with one another to form a mixture, heating the mixture to a temperature at which a mixture of oxides is present, preferably in completely molten form, then cooling down the mixture to form at least one composite oxide phase with a general formula V.sub.x Mo.sub.y O.sub. 32, and then subjecting the composite oxide phase to a reducing treatment to prepare a lower-oxygen composite oxide phase with the same structure.
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机译:包含至少一种金属钒和钼的氧化物的抗砷复合氧化物催化剂,包括至少一种复合氧化物相,其中所述至少一种金属钒和钼的氧化物用于在还原剂例如氨或一氧化碳的存在下还原烟道气中的氮氧化物。通式V x Mo y O 32,其中x + y≦在图12中,其中x≧ 1和y≧ 1,以及可选的MoO.sub.3相。一种制备抗砷复合氧化物催化剂的方法,包括将氧化钒和氧化钼或其前体彼此混合以形成混合物,将该混合物加热至存在氧化物混合物的温度,优选以完全熔融的形式存在。然后冷却混合物,以形成至少一种通式为VxMoyyO。的复合氧化物相。然后,如图32所示,对复合氧化物相进行还原处理,以制备具有相同结构的低氧复合氧化物相。
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