A kind of halloysite/rare earth perovskite composite SCR catalyst and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of SCR catalysts in environment protection, and provides a halloysite / lanthanon perovskite composite SCR catalyst. The formula is ABO3 / HNTs, wherein A refers to a rear earth element, B is a metal cation, and HNTs is a halloysite nano tube carrier; the mass percentage of ABO3 is 5%-20%. According to the invention, the halloysite / lanthanon perovskite composite material is prepared by adopting a one-step sol-gel method; the perovskite particle size is less than 20nm, and the perovskite is uniform in load and relatively dispersive; the cost is reduced as well as the synergistic catalysis effect is developed; all metal cations in the liquid phase can be subjected to polymerization reaction by a complexing agent; a manganese ion and an aluminum ion which are contained in the carrier also can be involved in, which cannot be realized by coprecipitation of metal cations via adjusting the pH value. The manganese ion and the aluminum ion as well as lanthanon perovskite are doped, so that the lattice imperfection of an active component is increased, facilitating the improvement of the catalytic activity.

Description

technical field [0001] The invention belongs to the technical field of SCR catalyst production in environmental protection, and in particular relates to a preparation method of halloysite / rare earth perovskite and its low-temperature SCR denitrification application. Background technique [0002] my country is a big coal-fired country, a large amount of dust generated by coal-fired power plants, SO x , NO x and harmful metal elements, seriously affecting the ecological environment of the earth and affecting human health. Nitrogen oxides are one of the main pollutants that cause acid rain and photochemical smog. After chemical reactions, nitrogen oxides NO will form NO 2 , O 3 with photochemical smog, where NO 2 There is a strong irritation to the human eyes and respiratory organs, which can cause pulmonary edema and death in severe cases. NO 2 It is also the main substance that forms acid rain, which can cause great harm to buildings and crops. Therefore, it is imperat...

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Problems solved by technology

In 2012, Zhang Yibo and others published an article on Volume 33, Issue 9 of "Chinese Journal of Catalysis", pointing out that LaMnO 3 and BiMnO 3 There is a certain SCR denitrification activity at 100-240°C, but the applicant found that in the actual application process, these materials have the problems of low mechanical strength, high cost, and difficult recycling, which ultimately affects the denitrification effect and restricts the catalyst. Industrial application and further promotion

In recent years, there have been many reports on perovskite catalysts and halloysite as a catalyst carrier, but there is no report on the combination of the two used in low-temperature SCR denitrification, and there is no high-efficiency SCR catalyst in the low-temperature segment.

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