SCR (silicon controlled rectifier) catalyst slurry and preparation method and application thereof

Abstract

The invention discloses SCR (silicon controlled rectifier) catalyst slurry and a preparation method and application thereof. The SCR catalyst slurry comprises, by weight, 100 parts of a SCR catalyst,0.2-4 parts of cellulose ether, 0.05-5 parts of a form-forming agent, 5-40 parts of alumina sol, 3-20 parts of silica sol, 0.01-5 parts of a deforming agent and 50-150 parts of water. By the arrangement, the SCR catalyst slurry with obvious decreasing of air-drying speed and obvious increasing of viscosity can be obtained.

Description

technical field [0001] The invention relates to an SCR catalyst slurry and its preparation method and application, in particular to an SCR catalyst slurry used for denitrification of motor vehicle tail gas and its preparation method and application. Background technique [0002] Exhaust gas emitted by motor vehicles contains a large amount of nitrogen oxides NOx, which causes air pollution. Selective Catalytic Reduction (SCR) is commonly used in the treatment of nitrogen oxides. Under the action of SCR catalyst, using reducing agent (such as NH 3 , liquid ammonia, urea, etc.) to selectively react with NOx in the flue gas to generate non-polluting N 2 and H 2 O. Among them, the SCR catalyst is the key. [0003] CN102698736A discloses a technology for preparing catalyst slurry by mixing titanium tungsten powder, ammonium metavanadate, soluble rare earth salt, soluble zirconium salt, etc. CN101912775A discloses a method for directly preparing catalyst slurry by using tita...

AI Technical Summary

Problems solved by technology

The above method needs to use aluminum sol and silica sol to prepare composite colloid, and then prepare coating slurry, resulting in a significant reduction in production efficiency

Simultaneously, the solid content of the coating slurry formed by the composite colloid of the above method is up to 18.3%, and the air-drying speed is too fast

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