Abstract
The presence of alkali metals in exhaust gas from stationary resources causes a grand challenge for the practical application of selective catalytic reduction(SCR)of NOx with NH3.Here,alkali-resistant NOx reduction has been successfully implemented via tailoring the electron transfer over Fe and V species on FeVO4/TiO2 catalysts.The strong interaction between Fe and V induced electron transfer from V to Fe and strengthened the adsorption and activation of NH3 and NO over active VOx sites.In the presence of K2O,the strong electron withdrawing effect of Fe offset the electron donating effect of K on the VOx species,thus protecting the active species VOx to maintain the NOx reduction ability.The enhanced adsorption and activation of NH3 allowed SCR reaction to proceed via E-R mechanism even after K2O poisoning.This work elucidated the electronic effects on the alkali metals resistance of traditional ferric vanadate SCR catalysts and provided a promising strategy to design SCR catalysts with superior alkali resistance.
基金项目
国家自然科学基金(22125604)
Shanghai Rising-Star Program(22QA1403700)
Shanghai Education Development Foundation and Shanghai Municipal Education Commission(22Z00354)
万方数据