Low-temperature low-SO2-oxidation-rate honeycomb denitration catalyst and preparation method thereof

Abstract

The invention discloses a low-temperature low-SO2-oxidation-rate honeycomb denitration catalyst and a preparation method thereof. The catalyst is prepared from, by mass, 1-5% of V2O5, 0.01-6% of WO3, 0.01-10% of MoO3, 0.01-0.5% of MgO, 3-6% of glass fibers, 66.5-95.96% of TiO2 and one or more of 0.01-1% of B2O3, 0.01-1% of F, 0.01-2% of P2O5, 0.01-1% of SnO2 and 0.01-1% of Sb2O3. Anatase type titanium dioxide serves as a carrier, V2O5 serves as an active center, and auxiliary agents including MgO, B2O3, F, SnO2, P2O5, Sb2O3 and the like are added to enhance synergistic effects among the active center, the auxiliary agents and the carrier to realize preparation of the low-temperature low-SO2-oxidation-rate honeycomb denitration catalyst. Compared with existing industrial V2O5-WO3-TiO2 catalysts, the denitration catalyst prepared according to the method has advantages of wide operating temperature window, high denitration efficiency, low SO2 oxidation rate, high water resistance, less proneness to hole blockage, long service life and the like and is especially suitable for low-temperature conditions (200-300 DEG C).

Description

technical field [0001] The invention relates to a low-temperature low-SO 2 Oxidation rate honeycomb denitration catalyst and preparation method thereof. Background technique [0002] According to the National Emission Ceilings Directive (NECD) issued by the European Union, it is pointed out that NO x It is the main atmospheric environmental pollutant, which not only brings great harm to human health, but also causes irreparable impact on the environment, such as causing greenhouse effect, ozone layer destruction, photochemical smog and acid rain. Therefore, most countries have promulgated corresponding bills to limit industrial NO x emissions. [0003] "During the 12th Five-Year Plan", my country launched a large number of NH in coal-fired power plants 3 -SCR denitrification project effectively suppresses NO in coal-fired power plants x emissions. In addition to coal-fired power plants, there are many industrial combustion flue gases in my country, such as iron and s...

AI Technical Summary

Problems solved by technology

However, due to the use of cerium manganese as the active component, it is easy to be poisoned and deactivated, and SO 2 High conversion rate, difficult for industrial application

Most of the existing low-temperature denitrification catalysts on the market use the active component V 2 o 5 content to reduce catalyst service temperature, but V 2 o 5 Excessive content will cause SO 2 High oxidation rate (2-10%), easy to react with NH 3 The reaction forms ammonium bisulfate, which blocks the pores of the catalyst and causes rapid deactivation of the catalyst