Cellular SCR denitration catalyst unit hardening liquid and use method thereof

Abstract

The invention discloses a cellular SCR denitration catalyst unit hardening liquid. The cellular SCR denitration catalyst unit hardening liquid comprises, by weight, 20-40 parts of water, 10 parts of aluminum sulfate, and a proper amount of an organic acid, wherein the organic acid is oxalic acid or citric acid, and a molar ratio of the organic acid to aluminum sulfate is 4:1-1:4. The invention also discloses a use method of the cellular SCR denitration catalyst unit hardening liquid. The organic acid and aluminum sulfate are adopted as a hardening liquid and can form a complex, and the complex is uniformly distributed in a catalyst, improves the anti-wear strength of the catalyst, reduces the wear rate by 30-80%, avoids the high temperature and high dust influences of smoke gas, avoids the wear and collapse phenomenon and prolongs the life of the catalyst. The hardening liquid forms a layer of compact alumina on the top of the cellular SCR denitration catalyst after calcining, and does not realize catalyst poisoning, so the activity of the catalyst is not influenced.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, relates to a honeycomb SCR denitration catalyst unit hardening liquid, and also relates to a method for using the honeycomb SCR denitration catalyst unit hardening liquid. Background technique [0002] Nitrogen oxides (NO X ) Is one of the main air pollutants, including NO, NO 2 Many kinds of nitrogen oxides will cause certain harm to human health and the survival of animals and plants, such as the formation of acid rain, photochemical smog, etc., and also produce a variety of secondary pollution. In today's increasingly strong environmental awareness and requirements, how to remove nitrogen oxide emissions has become an increasingly urgent problem. At present, my country's nitrogen oxides are mainly produced from coal combustion and industrial smoke emissions. The traditional honeycomb denitrification catalyst components are V, W / TiO 2 , Can remove the NOx in the flue gas, but the top of the tradit...

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Problems solved by technology

[0003] The Chinese invention patent application with the application number 200810147802.X discloses a selective catalytic reduction flue gas denitrification catalyst and its manufacturing method, in which the hardening solution is an aluminum salt solution, and through simple impregnation, wind blowing and calcination, alumina is formed on the surface of the catalyst Layer, improve the anti-wear strength of the catalyst, but the amount of aluminum salt covered on the surface of the catalyst by impregnation is very small, so the improved anti-wear strength is limited

[0004] The Chinese invention patent application with the application number 201310243987.5 discloses a SCR denitrification catalyst module hardening solution, which contains 2-5% aluminum hydroxide, 6-20% phosphoric acid and 1-5% active ingredients, and the balance is water. Although the hardening solution can improve the wear resistance of the top of the catalyst, its calcination to produce alumina will block the progress of selective catalytic reduction, while phosphoric acid calcination produces P 2 o 5 It will poison the catalyst, resulting in a decrease in catalyst activity and a large negative impact