Catalyst for flue gas denitrification at 250-270 DEG C, and preparation method and application thereof

The invention belongs to the technical field of environmental protection, and relates to a catalyst for flue gas denitrification at 250-270 DEG C, a preparation method thereof and application thereof in the denitration treatment of exhaust gas containing nitrogen oxide. The catalyst comprises a catalyst coating and honeycomb ceramic, wherein the catalyst coating coats on the surface of honeycomb ceramic. The catalyst coating includes deionized water and a slurry group comprising the following components by weight: 40-60% of zeolite, 10-30% of nanometer alumina, and 10-30% of a catalytic active component, wherein the deionized water is added by the liquid-solid ratio of 1-3:1. The preparation method comprises the steps of: (1) mixing components of catalyst coating; (2) conducting ball milling on the mixed components to obtain the coating slurry; (3) coating; and (4) roasting. The invention provides application of the catalyst in the denitration treatment of exhaust gas containing nitrogen oxide. The denitratio