Research progress on deactivation mechanism and preventive measures of V2O5-WO3/TiO2 catalyst
With growing global energy demand and the improvement of environmental protection re-quirements,selective catalytic reduction(SCR)technology has attracted considerable attention as an ef-fective way to reduce atmospheric nitrogen oxide(NOx)emissions.However,the vanadium-titanium-based V2O5-WO3/TiO2 SCR catalyst as the key role of SCR will encounter deactivation problems during long-term operation,which limits its practical application.Therefore,it is significant to study the deac-tivation mechanism and preventive measures.This paper systematically expounds on the deactivation mechanism of the catalyst and the preventive measures.The deactivation of the catalyst is mainly caused by the high-temperature environment and the dust,alkali(earth)metal,acid gas and heavy metal in the flue gas through physical or chemical action.In order to slow down the deactivation of the cata-lyst and prolong its service life,the preventive measures were reviewed from three aspects including pre-dust removal,catalyst modification and SCR system optimization.Studying the deactivation mechan-ism of the catalyst can not only make the component changes clear in the deactivation process,but also provide a basis for the inactivation prevention and the preparation of new catalyst materials.This article provides a reference for prolonging the working time of V2O5-WO3/TiO2 SCR catalyst and recovering waste SCR catalyst.
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