Cu/Mn-SSZ-39 catalyst, preparation method and application thereof

Abstract

The invention discloses a Cu / Mn-SSZ-39 catalyst, a preparation method and the application thereof. The catalyst is characterized by the catalyst taking H-SSZ-39 molecular sieve as a carrier, and active components comprise copper and manganese. Through the synergistic effect between copper and manganese, the catalyst ensures that the denitration ratio is 42 to 66 percent at 150 DEG C, and reaches 100 percent at 200 to 420 DEG C, and shows excellent SCR activity at 150 to 500 DEG C. The Cu / Mn-SSZ-39 catalyst formed through an ion exchange method not only has low-temperature activity and high denitration ratio, but also has a wide activity temperature window, and the preparation method is simple, can be completely used for catalytic reduction of oxynitride, can eliminate oxynitride in dieselvehicle tail gas, and is applicable to diesel vehicle tail gas purification systems.

Description

technical field [0001] The invention relates to the technical field of environmental catalysis, and more specifically, to a Cu / Mn-SSZ-39 catalyst and its preparation method and application. Background technique [0002] With the increase of people's demand for motor vehicles, the exhaust emissions of diesel vehicles are increasing day by day, NO x is the main pollutant in the exhaust of diesel vehicles, NO x A large amount of emissions have caused acid rain, smog, etc. in many areas, which have had adverse effects on the human body and the ecological environment. Currently in NH 3 selective catalytic reduction (NH 3 -SCR) technology is to eliminate NO x customary means, where the commonly used NH 3 -SCR catalysts are promising vanadium tungsten titanium catalysts (V 2 o 5 -WO 3 / TiO 2 ), but the low-temperature activity of the catalyst is poor, the activity temperature window is narrow, and its active component vanadium is toxic, endangering human safety and ecologi...

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Problems solved by technology

[0004] The primary purpose of the present invention is to overcome the defects of poor catalyst low temperature activity and narrow activity temperature window in the above-mentioned prior art, and provide a Cu / Mn-SSZ-39 catalyst, which uses H-SSZ-39 molecular sieve as a carrier, and passes through The synergistic effect of copper and manganese elements improves the low-temperature catalytic activity of the catalyst, and has excellent SCR denitration activity, and the temperature window under 90% denitration rate is 183-432°C, which has a wide activity temperature window

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