Novel composite carrier SCR flue gas denitration catalyst

Abstract

The invention belongs to the field of environmental protection and environmental catalysis, and in particular relates to a novel composite carrier SCR flue gas denitration catalyst. An SCR flue gas denitration catalyst which takes TiO2-mesoporous SiO2 as a compound carrier is obtained by preparing the TiO2-mesoporous SiO2 by hydrolyzing tetrabutyl titanate in mesoporous SiO2 by adopting a sol-gel method, taking the TiO2-mesoporous SiO2 as the compound carrier of the SCR catalyst, supporting a cocatalyst on the TiO2-mesoporous SiO2 compound carrier, and finishing the supporting of a main catalyst. The catalyst comprises the following components in percentage by mass: 85 to 99.9 percent of the compound carrier, 0 to 5 percent of the cocatalyst and 0.1 t0 10 percent of the main catalyst, wherein the compound carrier consists 80 to 95 weight percent of the mesoporous SiO2 and 5 to 20 weight percent of the TiO2. The introduction of the mesoporous SiO2 greatly increases the specific area of the catalyst; and the catalyst has high dispersibility of active substance and high stability, contributes to a gas to enter pores to fully react with the catalyst because the carrier has regular pore structures, and has high denitration performance.

Description

technical field

[0001] The invention belongs to the field of environmental protection and environmental catalysis, in particular to a TiO 2 - Mesoporous SiO 2 SCR catalyst suitable for power plant flue gas denitrification as carrier. Background technique

[0002] Nitrogen oxides (NOx) are one of the main air pollutants, including NO, NO 2 , N 2 O, N 2 o 3 and N 2 o 4 etc., mainly NO and NO 2 Exist in the form of NOx, of which NO accounts for about 90% of the total NOx. The emission of nitrogen oxides will cause environmental problems such as acid rain, greenhouse effect and ozone layer destruction, and seriously endanger human health and social development.

[0003] At present, the world's industrial application of denitrification technology is mainly divided into low NOx combustion technology, SNCR technology and SCR technology. Selective Catalytic Reduction (SCR) denitrification technology has a very high NOx removal rate, and is the most widely used and mature f...