Advances in low-temperature flue gas denitrification catalyst research
In coal-fired,cement and waste incineration plants,water vapour and SO2 contained in the flue gas could easily lead to poisoning and deactivation of the catalyst under low-temperature environ-ments.Therefore,addressing low-temperature anti-water vapour and SO2 poisoning has become a criti-cal technical challenge.Firstly,the technical difficulties faced by NH3-SCR denitrification catalysts in industrial low-temperature environments are analyzed,including the mechanisms of water vapour and SO2 poisoning,and then the research strategies to improve the water and SO2 resistance of catalysts in recent years are elaborated in depth.It includes designing hydrophobic coatings and using elemental synergism to improve the electronic structure of the catalyst surface,etc.to inhibit the adsorption and oxidation of SO2;using acidic sites and redox-active sites to promote the decomposition of ammonium bisulphate salts;and adding sacrificial agents to improve the stability of the catalyst.Finally,the strate-gies for improving the anti-poisoning were summarised and prospected,aiming to provide insights into the design and preparation of low-temperature flue gas denitrification catalysts with high efficiency,strong anti-poisoning ability and long service life.
Low temperature flue gas denitrificationNH3-SCRResistance to water vapour poisoningResistance to SO2 poisoningCatalyst
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