Low temperature SCR denitration catalyst taking organic metal framework as carrier and preparation method thereof

Abstract

The invention relates to a low temperature SCR denitration catalyst taking an organic metal framework as a carrier and a preparation method thereof, belonging to fields of an air pollution regulation technology and an environmental protection catalytic material. The preparation method comprises the following steps: loading oxides of one or more metal elements of Mn, Fe, Cu, V and Ce on an MOFs catalyst carrier to serve as effective components by an immersion method; and obtaining the catalyst by drying, calcinating and sieving, wherein in terms of the total mass of the catalyst, the content of the loaded active metal oxides is 1-20% by mass and the working temperature of the catalyst is 80-200 DEG C. The catalyst has larger specific area surface, higher low temperature catalytic activity,good denitration effect and wide industrial application prospect in the flue gas denitration process.

Description

technical field [0001] The invention relates to a low-temperature SCR denitrification catalyst with metal-organic frameworks (MOFs) as a carrier and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Nitrogen oxides (NOx) are one of the main air pollutants that cause a series of problems such as acid rain and photochemical smog that destroy the earth's ecological environment, and are also the focus and difficulty of atmospheric environmental protection. A large number of methods have been used to study the reduction of nitrogen oxide emissions, among which, NH 3 Selective Catalytic Reduction (SCR) as a reducing agent is currently the most effective method for removing NOx from stationary sources in industry. [0003] Commercial SCR catalysts are mostly vanadium-based catalysts, such as V 2 o 5 / TiO 2 or V 2 o 5 -WO 3 / TiO 2 Wait. The active temperat...

AI Technical Summary

Problems solved by technology

Since the flue gas has not been treated for desulfurization and dust removal, such an arrangement will cause the catalyst to be exposed to high concentrations of soot and SO 2 The scouring, wear and pollution poisoning of impurities in the fly ash, the high temperature of the flue gas will also cause the catalyst to sinter, deactivate, or generate NH 3 Oxidized to NO side reactions, etc.

In addition, for the existing boilers in our country, the economizer, the air preheater and the boiler are generally integrated, so this technology is also difficult to match with the existing boilers in our country

It should be more reasonable to place the SCR reactor after the air preheater, dust collector and desulfurization device. However, in this configuration, since the temperature of the flue gas after desulfurization and dust removal is generally lower than 200 ° C, it is unavoidable. The flue gas is reheated, which will greatly increase the cost of denitrification, increase system energy consumption and operating costs