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

Abstract

The invention discloses a method for preparing SCO denitrification catalyst by plasma method. The method is: 1. Screening lignite particles through a screen, and then roasting them in a tube furnace to obtain pyrolysis coke; 2. Using an equal volume impregnation method Dip the pyrolysis coke in the manganese nitrate solution to obtain pyrolysis coke impregnated with manganese nitrate; 3. Dip the pyrolysis coke impregnated with manganese nitrate into the cobalt nitrate solution through the equal volume impregnation method to obtain the pyrolysis coke impregnated with manganese nitrate and Pyrolysis coke of cobalt nitrate; 4. The pyrolysis coke impregnated with manganese nitrate and cobalt nitrate is dried in an electric furnace and then placed in a plasma reactor for low-temperature plasma roasting treatment to obtain an SCO denitration catalyst; the present invention prepares denitration by The existing preparation method of the catalyst was improved. The plasma method and changing the background gas were used to modify the pyrolysis coke surface of the catalyst, which increased the proportion of the pore structure on the catalyst surface and improved the catalytic performance of the SCO denitration catalyst.

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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