Flue gas denitrification catalyst and preparation method thereof

Abstract

The invention discloses a flue gas denitrification catalyst and a preparation method thereof. The flue gas denitrification catalyst comprises a carrier component TiO2, an active component CeO2 and an assistant MoO3, wherein the mass of the CeO2 accounts for 5-20wt percent of that of the TiO2, and the mass of the MoO3 accounts for 1-20wt percent of that of the TiO2. According to the flue gas denitrification catalyst, anatase type titanium dioxide is used as a carrier, and by adopting a sol-gel method, the active component cerium oxide and a cocatalyst molybdenum trioxide are loaded on the carrier. The catalyst is a selective reduction denitrification catalyst with the good activity, in a range of 300-450 DEG C, the NO conversion rate of more than 90 percent can be maintained and relatively high water-resisting and sulphur-resisting performances are obtained; at a temperature of 350 DEG C, after sulfur dioxide and water vapor are introduced for 7.5h, the NO conversion rate can be kept more than 80 percent, and after the introduction of the sulfur dioxide and the water vapor is stopped, the NO conversion rate is recovered to be 97 percent.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a TiO 2 A flue gas denitrification catalyst loaded with cerium and molybdenum and a preparation method thereof. Background technique [0002] At present, the air pollution situation in our country is very serious. While the traditional soot-type pollution has not been controlled, the regional composite air pollution characterized by ozone, fine particulate matter (PM2.5) and acid rain is becoming more and more prominent, seriously restricting the social economy. sustainable development, threatening the health of the people. Nitrogen oxides (NO x ) is one of the important causes of air pollution such as ozone, fine particulate matter, and acid rain. How to effectively control the emission of nitrogen oxides has become one of the important topics in the field of air pollution control in my country. On July 29, 2011, my country issued the newly revised "Emission Sta...

AI Technical Summary

Problems solved by technology

There are still some problems in the application of these catalysts: 1) the active temperature range is small; 2) the vanadium component in the catalyst has certain hazards to human health; 3) the formation of N 2 High activity of O, N 2 The emission of O will pollute the atmosphere; 4) it is easy to remove SO in the flue gas 2 Oxidation to SO 3 , H 2 O and NH 3 with SO 3 The reaction produces sulfammonium salt ((NH 4 ) 2 S 2 o 7 and NH 4 HSO 4 ), sulfur ammonium salts will corrode downstream equipment such as air preheaters, and cause catalyst deactivation; 5) SCR catalysts are expensive