Scr catalyst for removal of nitrogen oxides

Abstract

The present invention provides for catalysts for selective catalytic reduction of nitrogen oxides. The catalysts comprise metal oxide supporters, vanadium, an active material, and antimony, a promoter that acts as a catalyst for reduction of nitrogen oxides, and at the same time, can promote higher sulfur poisoning resistance and low temperature catalytic activity. The amount of antimony of the catalysts is preferably 0.5-7 wt %.

Description

TECHNICAL FIELD[0001]The present invention relates to catalysts for selective reduction of nitrogen oxides, and more particularly to catalysts for removal of nitrogen oxides that have enhancing effects on the reduction activity of nitrogen oxides at low temperatures and on the sulfur poisoning resistance.BACKGROUND ART[0002]Nitrogen oxides (NOx) are usually produced when fuels are combusted, and are exhausted from moving sources such as a motor vehicle and fixed sources such as a power plant or an incinerator. These nitrogen compounds are identified as the major causes of acid rain and smog formation. Since environmental protection regulations have become stricter recently, more studies are being carried out, in response, in order to reduce nitrogen compounds through catalysts.[0003]As a method of removing nitrogen compounds that were emitted from fixed sources, selective catalytic reduction (SCR) device that uses vanadium oxides (V2O5) as active materials impregnated on a titanium ...

AI Technical Summary

Benefits of technology

[0020]According to the present invention, antimony is added to promote the reactivity at low temperatures and the sulfur poisoning resistance. Preferably, 0.5-6 wt. % of antimony is added. B

Problems solved by technology

The produced ammonium bisulfate salts are imbedded into the surfaces of the catalysts, thereby interfering with the reduction reaction.

As a result, as the amount of unreacted ammonia increases, formation of sulfur trioxides (SO3) is promoted, thereby accelerating the sulfur poisoning, which eventually shorten the life of the catalysts.

%, the increase in the price of catalysts is unavoidable.

A conventional art uses a TiO2 supporter impregnat

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