Honeycomb low temperature flue gas denitration catalyst and preparation method thereof

Abstract

The invention relates to a honeycomb low temperature flue gas denitration catalyst and a preparation method thereof, and belongs to the field of atmosphere pollution control and environment catalysis materials. The catalyst adopts TiO2, V2O5, MoO3, WO3 and rare earth (La, Ce, Pr, Nd, Zr and Y) oxides as active components and P2O5 and SO3 as modification assistants, and is prepared through powder preparation, mixing and kneading steps. The catalyst has an excellent removal effect on NOx in low temperature flue gas, and the denitration efficiency at 170-180DEG C can reach 90% or above. The catalyst has high mechanical strength and anti-wear resistance, the vertical compressive strength is greater than 2.4MPa, and the hard end fly ash wear rate is smaller than 0.08% / Kg. The erosion, wearing and etching of fly ash to the catalyst are reduced, so the service life of the catalyst is prolonged. The catalyst has the advantages of simple and easily available production raw materials, simple and easily controllable preparation process, and easy realization of industrial production.

Description

technical field [0001] The invention belongs to the field of air pollution control and environmental catalytic materials, and specifically relates to a honeycomb low-temperature flue gas denitrification catalyst and a preparation method thereof. NOx emission control of flue gas or process waste gas, and denitrification process of electric boiler with low temperature and low dust arrangement. Background technique [0002] Nitrogen oxides (NOx), which have become 2 Another global air pollutant after that, NOx in the atmosphere has a high contribution value to many environmental problems such as global warming, acid rain, photochemical smog, increased surface ozone concentration, and water pollution, and has become a major urban air pollutant. primary pollutant. my country is a country with large NOx emissions, mainly from power plant boilers, transportation and various industrial processes. The annual emissions are more than 20 million tons, and it shows a trend of increasin...

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Problems solved by technology

Patent CN102266761 reports a method for preparing low-temperature SCR catalyst powder. First, the co-precipitation method is used to prepare ZrO 2 -TiO 2 Composite metal oxide supports, and then supported CeO by impregnation method 2 、WO 3 and V 2 o 5 Active component, the catalyst exhibits good catalytic activity in the range of 150-450°C, but its preparation process is complicated

Patent CN104841464 discloses a high-efficiency low-temperature SCR catalyst, 0.35-0.5wt% Br - Doping V 2 o 5 -WO 3 / TiO 2 Catalyst, which can improve the denitrification efficiency and sulfur resistance of the catalyst at low temperature, and further prolong the service life of the catalyst, but the catalyst molding method is reported, and the industrial application has certain limitations