Low-temperature denitration catalyst and preparation method thereof

Abstract

The invention relates to a low-temperature denitration catalyst and a preparation method thereof, and is characterized in that the catalyst is a solid solution composed of manganese oxide, iron oxide, tungsten oxide and yttrium oxide; in the solid solution, the molar ratio of zinc to manganese is (0.2-0.4) to 1, the molar ratio of tungsten to manganese is (0.2-0.3) to 1, and the molar ratio of yttrium to manganese is (0.1-0.2) to 1. The preparation method comprises the steps: firstly, dissolving a tungsten precursor and oxalic acid in deionized water, stirring and clarifying; then adding a zinc precursor, a manganese precursor, a yttrium precursor and a template agent, and fully mixing; then adding urea, and carrying out a reaction to obtain a product; and separating, drying, roasting, and crushing to obtain the low-temperature denitration catalyst. The catalyst has the advantages of good low-temperature activity and strong sulfur resistant and water resistant abilities.

Description

technical field [0001] The invention relates to a low-temperature denitration catalyst and a preparation method. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere. Existing in large quantities in the atmosphere can not only cause direct harm to the ecological environment and human health, but also interact with other pollutants to form more harmful secondary pollutants such as photochemical smog. secondary pollution. According to emission source characteristics, NO x The sources of energy can be divided into stationary sources and mobile sources. The stationary sources include thermal power plants, industrial boilers, nitric acid plants, and waste incineration, etc.; the mobile sources mainly come from automobiles, diesel vehicles, and air and water transportation. [0003] In recent years, with the rapid growth of coal and oil consumption in my country, NO x The emission of carbon dioxide is increasing year by year, and the re...

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Problems solved by technology

[0005] Chinese patent CN101879452A discloses a method for preparing a low-temperature denitrification composite oxide. The catalyst has good low-temperature activity, but its specific surface area is low, and N 2 The selectivity is poor, and its catalytic activity drops sharply when the reaction temperature exceeds 250°C

Invention patent CN100473456C discloses a SCR catalyst for boiler low-temperature flue gas denitrification and its preparation method. The catalyst uses activated carbon fiber as a carrier and manganese and cerium oxides as active components, which shows good low-temperature activity , but the catalyst has poor water resistance, insufficient mechanical strength, and is not easy to form

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