Composite smoke SCR (selective catalytic reduction) denitrification catalyst and preparation method thereof

Abstract

The invention relates to a composite smoke SCR (selective catalytic reduction) denitrification catalyst. The composite smoke SCR denitrification catalyst takes honeycomb ceramics, activated carbon or a molecular sieve as a carrier. A composite manganese-molybdenum-nickel-loaded metal oxide is an active component, one or more of copper, chromium, cerium, tin and lanthanum are used as cocatalysts, and the total mass of the active components of the catalyst and the cocatalysts accounts for 15-30% of the mass of the carrier, wherein the molar ratio of Mn to Mo to Ni is 1:(0.1-1):(0.1-1), and the molar ratio of manganese to a metallic element of the co-catalyst is 1: (0.1-1). The catalyst provided by the invention is prepared by adopting a dipping method. Compared with the existing denitrification catalyst suitable for the temperature lower than 300 DEG C, the catalyst provided by the invention has the advantages of high denitrification efficiency, low cost, simple production process, long service life, wide active temperature window, high SO2 and H2O poison resistance capability and the like. Within the temperature from 80 DEG C to 300 DEG C, the conversion rate of NO is more than 90%.

Description

technical field [0001] The invention relates to a flue gas denitration catalyst and a preparation method thereof, in particular to a selective catalytic reduction (SCR) denitration composite catalyst and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmospheric environment. Atmospheric NO X It can cause acid rain, photochemical smog, surface water eutrophication and other problems that damage the ecological environment and endanger human health. With NO X Emissions continue to increase, and environmental pollution is becoming more and more serious. my country has promulgated and implemented emission standards for air pollutants from thermal power plants for four times. The latest standard promulgated in 2009 stipulates that coal-fired power plants newly built, rebuilt and expanded in key areas sha...

AI Technical Summary

Problems solved by technology

Among the patents on low-temperature flue gas denitration catalysts and their preparation in the prior art, the catalysts disclosed in patents CN 101428215A, CN 10134722A, CN 101468314A, CN 101422728A and CN 101676019A all contain toxic components such as vanadium and tungsten, which seriously pollute the environment. The deactivated catalyst is difficult to handle; and the catalyst temperature above 180°C can achieve 90% denitrification rate

The catalyst disclosed in the patent CN 10554581A uses precious metals as active components, which is expensive, and the conversion rate of nitrogen monoxide of the catalyst is over 60% at 250°C

The catalysts disclosed in patents such as CN 101069855A, CN 101428215A, and CN 101658787A use mesoporous molecular sieve as a carrier or nano-scale titanium dioxide as a carrier. The disadvantages are that the catalyst has high preparation cost, complex process, and is difficult to realize industrial production.

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