Uniform-load cerium-based molecular sieve catalyst, preparation method and application thereof

Abstract

The invention relates to a uniform-load cerium-based molecular sieve catalyst, a preparation method and application thereof and discloses a cerium-based oxide catalyst for nitrogen oxide catalytic purification, a preparation method and application thereof. The catalyst is a metal oxide catalyst CeOx@ZrO2-TiO2, and CeOx is evenly dispersed to the surface of a zirconium titanium composite oxide ZrO2-TiO2. The uniform-load cerium-based molecular sieve catalyst is made of non-toxic and harmless raw materials. The cerium-based oxide catalyst which is excellent in catalytic activity, high in N2 generating selectivity and wide in operating temperature window is prepared through the simple and practical method, and the uniform-load cerium-based molecular sieve catalyst can be suitable for a nitrogen oxide catalytic purification device for a mobile source with diesel vehicle exhaust as a representative and a fixed source with coal-fired power plant exhaust as a representative.

Description

technical field [0001] The invention relates to a catalyst, a preparation method and its application, in particular to a cerium-based molecular sieve catalyst for catalytic purification of nitrogen oxides, a preparation method and its application. Background technique [0002] Nitrogen oxides (NO x , mainly referring to NO and NO 2 ) is one of the main air pollutants, which can lead to major environmental problems such as haze, acid rain, photochemical smog and water eutrophication, NO x It will also pose a great threat to human health. Therefore, effective control of NO x emissions have very important practical significance. [0003] With the increasingly stringent environmental regulations and standards, NO x The removal has become a research difficulty and hotspot for researchers, NH 3 -SCR technology (namely NH 3 Selective Catalytic Reduction of NO as Reductant x ) is currently the most widely used NO x purification technology. The core and key of this technolog...

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Problems solved by technology

[0005] For existing NH 3 - Insufficiency of SCR catalysts, and the problem of a large backlog of light rare earth element Ce, the present invention provides for the first time a metal molecular sieve catalyst formed by uniformly loading Ce on molecular sieves and its preparation method, which can be used as a catalyst for diesel vehicle exhaust. The representative mobile source and the stationary source NO represented by coal-fired power plant flue gas x Catalytic purification

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