Composite catalyst for directly decomposing nitrogen oxide under rich oxygen condition

Abstract

The present invention belongs to the field of pollution controlling technology, relates to catalyst for direct decomposition of nitrogen oxide, and is one kind of catalyst for direct decomposition ofnitrogen oxide under rich oxygen condition. The composite catalyst CuZSM-5 / MHn is prepared through mixing CuZSM-5 and MHn and roasting inside inert atmosphere at 500-800 deg.c for 2-3 hr. Inside the composite catalyst, MHn accounts for 5-15 wt%. The composite catalyst CuZSM-5 / MHn has high nitrogen oxide decomposing activity and high oxygen resisting activity. The composite catalyst has 20 % raised CuZSM-5 decomposition rate in the condition of oxygen content of 0-10 vol%, and unchanged high activity in the stability test of 10 hr.

Description

technical field [0001] The invention belongs to the field of pollution control and technology, and relates to a catalyst for directly decomposing nitrogen oxides, in particular to a catalyst for directly decomposing nitrogen oxides under oxygen-enriched conditions. Background technique [0002] Nitrogen oxides (NO x ) is the main air pollutant that causes acid rain, photochemical smog, etc. to damage the earth's ecological environment and damage human health. It mainly comes from coal and oil-fired high-temperature combustion boilers, nitric acid or nitrate factory exhaust, and automobile exhaust. In addition to some nitric acid plants and coal-fired power plants in my country, a large amount of nitrogen oxides in industrial combustion and automobile exhaust has not been effectively treated. Therefore, how to eliminate the pollution of nitrogen oxides is a topic of great concern in environmental protection. [0003] After my country's accession to WTO, automobile consumpt...

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Problems solved by technology

The disadvantage is that the cost of operating equipment is high, and there is a problem of secondary pollution caused by unreacted ammonia leakage