Automobile extrusion type SCR denitration catalyst with good low temperature activity and preparation method of automobile extrusion type SCR denitration catalyst

Abstract

The invention provides an automobile extrusion type SCR denitration catalyst with good low temperature activity. The catalyst comprises the following components in parts by weight: 100 parts of titanium tungsten powder, 1-3 parts of active promotion aids, 2-7 parts of hydroxypropyl methyl cellulose, 1-5 parts of polyoxyethylene, 2-5 parts of oleic acid, 1-6 parts of a glass fiber, 2-10 parts of ethylene glycol, 2-5 parts of lactic acid, 15-35 parts of a catalyst precursor solution, 2-6 parts of cholamine, 1-10 parts of silica sol, 4-10 parts of ammonia water and 1-16 parts of deionized water.The automobile extrusion type SCR denitration catalyst provided by the invention has remarkable advantages, the extrusion type catalyst is an active material as a whole, has a relatively large effective mass and excellent durability, and is remarkable in low temperature activity effect due to addition of the active aids; meanwhile, to meet identical emission standards, the amount of materials of the extrusion type catalyst is smaller than that of a coating catalyst, so that the raw materials can be saved, and the production cost can be reduced.

Description

technical field [0001] The invention relates to a catalyst, in particular to an extruded SCR denitrification catalyst used for automobile tail gas treatment and a preparation method thereof. Background technique [0002] With the sustained and stable growth of the national economy, the development of my country's automobile industry is optimistic, and the sales of automobiles continue to grow every year. With the continuous increase of the total number of automobiles in the country, the problem of automobile exhaust pollution is becoming more and more serious. The nitrogen oxides contained in it and the nitrogen in the air The combination of water can form acid rain, and these nitrogen oxides can also react with hydrocarbons under light conditions to form photochemical smog, so the emission of nitrogen oxides is extremely harmful to the environment. [0003] In the 1950s, the Americans proposed the SCR denitrification technology and applied for a patent. In the 1970s, the Jap...

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Problems solved by technology

Therefore, extruded SCR catalysts for vehicles have higher requirements than those for stationary source extruded SCR catalysts. At present, domestic researchers are still in the initial stage of research on extruded SCR catalysts for vehicles.