Wide-temperature high-efficiency catalyst for NOx removal by ammonia selective catalytic reduction ]and preparation method thereof

Abstract

The invention belongs to the technical field of catalysts and especially provides a wide-temperature high-efficiency NOx removal catalyst for ammonia selective catalytic reduction and a preparation method thereof. The catalyst consists of an active component, an auxiliary agent and a carrier. The weight of the active component accounts for 2%-10% of the weight of the catalyst, and the weight of the auxiliary agent accounts for 0.5%-7% of the weight of the catalyst. The active component is composed of a cupric oxide and / or a manganese oxide; the auxiliary agent is a mischmetal, a rare earth oxide or a transition metal oxide; and the carrier is Al2O3 or TiO2-Al2O3. The catalyst is particularly prepared by the steps of a drying operation and a roasting operation at a proper temperature. An NOx removal process at a wide temperature zone ranging from 100 DEG C to 400 DEG C can be achieved by the catalyst of the invention; meanwhile, the catalyst can be repeatedly used in normal after being washed and regenerated for several times in a nitrate tail gas denitration technology, and the catalytic intensity and the denitration performance are not decreased obviously. The catalyst of the invention is industrialized and has excellent industrial application prospect.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a wide-temperature and high-efficiency ammonia selective catalytic reduction to remove NO x Catalysts and their preparation methods. Background technique [0002] NO x It is one of the main pollutants in the atmospheric environment, with a large amount and a wide area, which poses a great threat to human health. Therefore, countries contain NO x There are strict restrictions on the emission of industrial exhaust gas, and the standards are becoming more and more stringent, so for NO x governance is very important. Currently, Governance NO x There are many methods of research, among which the selective catalytic reduction of ammonia to remove NO x As preferred, the main responses are: [0003] 4NO+4NH 3 +O 2 —4N 2 +6H 2 o [0004] 2NO 2 +4NH 3 +O 2 —3N 2 +6H 2 o [0005] Purification and removal of nitrogen oxides under medium and low temperature conditions, such as sodium...

AI Technical Summary

Problems solved by technology

Using activated carbon fiber as a carrier will bring problems such as complex production process, high carrier cost, high energy consumption and potential safety hazards in the industrial production process, and under working conditions, the temperature is 200 ° C, the gas contains 2-4% O 2 , long-term operation is a severe test for the strength and life of activated carbon fibers, so there is still a certain distance from industrial application

Especially not suitable for the two-sodium salt tail gas treatment process that requires washing and regeneration