SCR (Selective Catalytic Reduction) catalyst loaded with HgCl2 and preparation method thereof

Abstract

The invention provides an SCR (Selective Catalytic Reduction) catalyst loaded with HgCl2. The SCR catalyst comprises a carrier, an active component and an auxiliary catalyst. The SCR catalyst is characterized in that the HgCl2 is loaded on a fresh catalyst by an immersion method; the carrier is TiO2, the catalytic active component is V2O5 and the auxiliary catalyst is WO3. The SCR catalyst takes anatase type titanium dioxide as the carrier to load vanadium oxide active substances and a metal oxide catalyst which takes tungsten oxide or molybdenum trioxide as the auxiliary catalyst is assisted; the HgCl2 is loaded by the immersion method to prepare the SCR catalyst; the catalyst can be specially used for researching influences on the catalyst by mercury and an interaction mechanism, so as to provide novel ways and methods; all performance superficial characteristics can be detected and analyzed very well, such as SEM (Scanning Electron Microscope), specific surface area, activity, XPS (X-ray Photoelectron Spectroscopy) analysis and the like, so as to provide real and theoretical basis to reach the influences on the catalyst by the mercury and the interaction mechanism.

Description

technical field [0001] The invention belongs to the field of denitrification catalysts, and mainly relates to an SCR catalyst specially used for studying the influence of mercury on catalyst performance and a preparation method thereof. Background technique [0002] Nitrogen oxides are one of the main pollutants in the atmosphere, which can cause acid rain, photochemical smog, ozone layer depletion and other hazards. The main source is the flue gas of coal-fired power plants. The "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011) promulgated in July 2011 adjusted the emission limits of air pollutants. The emission limit of nitrogen oxides is 100mg / m 3 . At the same time, the National Environmental Protection "Twelfth Five-Year Plan" clearly stated that the total control target of nitrogen oxide emissions will be reduced by 10% compared with 2010, from 22.736 million tons in 2010 to 20.462 million tons, and continue to promote the reduction of po...

AI Technical Summary

Problems solved by technology

However, trace elements (such as mercury) in the flue gas have a poisonous effect on the catalyst, resulting in a decline in the denitrification performance of the catalyst, which seriously affects the service life of the catalyst

However, the research on the mechanism of mercury poisoning to catalysts is still not very clear.

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