Denitrification catalyst and preparation method thereof

Abstract

The invention discloses a denitrification catalyst and a preparation method thereof. The preparation method of the denitrification catalyst comprises the following steps: (1) preparing a Nb-containing solution; (2) adding a TiOx to the Nb-containing solution and obtaining a mixture through impregnation; (3) drying, grinding and roasting the mixture to obtain a Nb2O5-TiO2 carrier; (4) adding the Nb2O5-TiO2 carrier to a Mg and Ce salt solution to obtain a carrier-containing solution; (5) adding a precipitant and a surfactant to the carrier-containing solution, and obtaining the catalyst through cooling, pumping filtration or centrifugation, washing, drying and roasting. The denitrification catalyst prepared with the method has higher catalysis efficiency and wider low-temperature activity temperature range.

Description

technical field [0001] The invention relates to the field of denitration, in particular to a denitration catalyst and a preparation method thereof. Background technique [0002] The emission of nitrogen oxides will cause problems such as acid rain and photochemical smog, and the emission of nitrogen oxides has become a global air pollution problem. Reducing nitrogen oxides is an effective means to solve this problem. [0003] Selective Catalytic Reduction (SCR) technology is under the action of a denitrification catalyst to selectively convert NO x reduced to N 2 and H 2 O's technology. The denitrification efficiency can reach more than 90% stably, and it has a lower ammonia escape rate than the selective non-catalytic reduction (SNCR) technology. The key to selective catalytic reduction technology lies in the catalytic effect of the catalyst. The currently commercialized denitrification catalyst is V 2 o 5 -WO 3 / TiO 2 , the catalyst has a good catalytic effect at ...

AI Technical Summary

Problems solved by technology

The key to selective catalytic reduction technology lies in the catalytic effect of the catalyst. The currently commercialized denitrification catalyst is V 2 o 5 -WO 3 / TiO 2 , the catalyst has a good catalytic effect at 300-450°C, but it also has the following disadvantages: low-temperature activity is poor; V 2 o 5 It is easy to sublimate and fall off at high temperature and has biological toxicity; at high temperature, N 2 Poor selectivity; above 500°C due to TiO 2 The transition from anatase to rutile leads to a sharp decline in catalyst performance; a large number of researchers have begun to turn their attention to metal oxides as catalysts

[0004] The patent application "Denitrification catalyst and its preparation method and flue gas denitrification method" with the application number 201510159319.3 discloses a denitrification catalyst and its preparation method. The active ingredients of the denitrification catalyst disclosed in this application are manganese oxide, titanium oxide, cerium oxide and molybdenum oxide; the main means of its preparation method is to obtain the carrier by drying the solution of titanium dioxide, molybdate and complexing agent, and then add the carrier to the mixture containing manganese compound, cerium compound and complexing agent for centrifugal drying to obtain denitrification Catalyst; the principle is to increase the catalytic efficiency by increasing the specific surface area of ​​the denitrification catalyst. However, whether the distribution of metal oxides is uniform directly affects the catalytic efficiency of the catalyst. At present, there is still no effective means to make the distribution of metal oxides uniform

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