Denitrification catalyst for high-temperature flue gas and preparation method thereof

Abstract

The invention relates to a denitration catalyst for high-temperature smoke and a preparation method of the denitration catalyst. According to the denitration catalyst, a rare earth oxide-zirconium oxide compound oxide is used as a carrier, and a mol ratio of a rare earth oxide to zirconium oxide is 1:10-10:1; a main catalyst is tungsten oxide or molybdenum oxide or a mixture of tungsten oxide and molybdenum oxide, the content of the main catalyst is 10-40 weight percent, a cocatalyst is a transition metal, and the content of the cocatalyst is 1-4 weight percent. The preparation method comprises the following steps: dissolving all raw materials in deionized water, heating a solution in a water bath to 90-100 DEG C and insulating for 4-6h, then ageing and drying, then calcining at a temperature of 550-600 DEG C for 3-5h, grinding, and sieving to prepare the denitration catalyst. The preparation method disclosed by the invention is simple; the prepared denitration catalyst is suitable for treating a fuel gas or oil high-temperature unit, can be used at a high temperature of 450-600 DEG C, has a good selectivity, is relatively low in cost in comparison with a molecular sieve, has relatively good high-temperature activity, heat stability and denitration activity, and has a denitration rate of reaching above 80 percent.

Description

technical field

[0001] The invention relates to a denitration catalyst for high-temperature flue gas and a preparation method thereof, belonging to the technical field of catalyst synthesis and preparation. Background technique

[0002] China's coal-fired power plants consume 1.7 billion tons of coal each year, accounting for 51% of the country's coal production. Coal-fired power plants are the largest source of air pollution in the country and one of the main sources of atmospheric nitrogen oxide pollutants in the country. From January 1, 2012, China will implement the world's most stringent "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), and the Ministry of Environmental Protection has issued a notice to fully start denitrification.

[0003] NH 3 - The SCR method is one of the mature and effective methods for implementing nitrogen oxide emissions in the thermal power industry. Catalyst activity, mechanical strength, anti-poisoning performan...

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