Low-vanadium-content wide-active-temperature-window denitration catalyst and preparation method thereof

Abstract

The invention discloses a low-vanadium-content wide-active-temperature-window denitration catalyst, which is made from raw materials of 0.05-0.2 by weight of ammonium metavanadate, 0.1-3 parts by weight of ammonium metatungstate or a mixture of 0.1-3 parts by weight of ammonium metatungstate and 0.1-10 parts by weight of ammonium molybdate, 60-80 parts by weight of TiO2, 10-20 parts by weight of an additive, and 15-30 parts by weight of deionized water. Vanadium in the denitration catalyst is controlled at a low content, so that the cost of the catalyst is reduced at a certain degree, and the low vanadium content in the range doesn't cause secondary pollution. Through introduction of the new additive, vanadium in the denitration catalyst is uniformly dispersed, so that vanadium active sites are formed on the surface of the catalyst as much as possible, and the use ratio of vanadium is increased. Furthermore, through introduction of the new additive, the surface acidity and redox performance of the catalyst are improved, thereby improving the performance of the catalyst. The testing result of a pilot-plant test system for simulating industrial smoke and the industrial actual operation of demonstration projects show that the catalyst can well satisfy the operating requirements of variable load conditions in a coal-fired power plant.

Description

technical field [0001] The invention relates to the technical field of denitration catalysts, in particular to a low vanadium wide activity temperature (the high activity temperature window of the denitration catalyst is extended to 250-420° C.) window denitration catalyst and a preparation method thereof. Background technique [0002] The emission reduction of nitrogen oxides (NOx) in domestic coal-fired power plants has entered a critical stage, and new requirements have been put forward for denitrification technology. Under the new economic normal, the power consumption of domestic industrial enterprises has dropped significantly, coupled with the adjustment of energy structure, the increase in the proportion of power outsourcing in some areas and other policy factors have led to the reform of the power supply structure, the "National Power Supply and Demand Situation Analysis and Forecast Report 2016" issued by the China Electricity Council "It is predicted that the util...

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Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies of the prior art, and provides a low vanadium wide active temperature window denitrification catalyst suitable for variable load conditions of coal-fired power plants. The operation shows that the catalyst not only has better NOx removal effect under continuous low-load low-temperature conditions, but also exhibits lower SO 2 Oxidation rate, and stable operation, can better solve the problems faced by coal-fired power plants such as insufficient low-temperature activity of traditional catalysts, poor resistance to sulfur poisoning of transition metal and rare earth element catalysts, and low vanadium content can also effectively reduce the impact of leaching of vanadium species The secondary pollution of the environment has realized the full-load denitrification of flue gas from coal-fired power plants, and has good market application value

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