A kind of method for preparing sco denitration catalyst by plasma method

Abstract

The invention discloses a method for preparing an SCO denitration catalyst by virtue of a plasma method. The method comprises the following steps: (1) sieving brown coal particles by virtue of a sieve, and roasting the brown coal particles in a tubular furnace, so as to obtain pyrolysis coke; (2) dipping the pyrolysis coke into a manganese nitrate solution by virtue of an equivalent-volume impregnation method, so as to obtain pyrolysis coke dipped with manganese nitrate; (3) dipping the pyrolysis coke dipped with manganese nitrate into a cobalt nitrate solution by virtue of the equivalent-volume impregnation method, so as to obtain pyrolysis coke dipped with manganese nitrate and cobalt nitrate; and (4) frying the pyrolysis coke dipped with manganese nitrate and cobalt nitrate by virtue of an electric furnace, putting the pyrolysis coke into a plasma reaction kettle, and carrying out low-temperature plasma roasting, so as to obtain the SCO denitration catalyst. By improving existing preparation methods of denitration catalysts, the catalyst is subjected to pyrolysis coke surface modification by utilizing a plasma method and changing background gas, so that the ratio of a surface pore structure of the catalyst is increased, and the catalytic performance of the SCO denitration catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of denitration catalysts, and in particular relates to a method for preparing an SCO denitration catalyst by a plasma method. Background technique [0002] The catalysts currently used in flue gas denitrification mainly include noble metal catalysts, molecular sieve catalysts and metal oxide catalysts. Noble metal catalysts have high activity for the oxidation of ammonia in the catalytic reduction process, but in the selective catalytic reduction process, the consumption of reducing agent is large, the operating cost is high, and sulfur poisoning and oxygen inhibition are prone to occur. Molecular sieve catalysts have high activity in the medium and high temperature region, and the activity temperature range is wide, but the problems of water inhibition, sulfur poisoning and low activity at low temperature limit their industrial application. Metal oxide catalysts mainly include single metal oxides, supporte...

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Problems solved by technology

[0004] Existing methods for preparing denitration catalysts mainly include the impregnation method and the sol-gel method. These two methods all involve long-term high-temperature roasting in the process of preparation, and the catalyst after roasting is easy to agglomerate (such as figure 1 As shown), the catalytic performance is poor, and the obvious advantages of the SCO denitrification cannot be brought into play when combined with the SCO method. Therefore, it is necessary to design a denitrification catalyst for the SCO method denitrification, which can significantly bring out the advantages of the SCO method denitrification

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