Abstract
Commercial V2O5-based catalysts have been successfully applied in NH3 selective catalytic reduction(NH3-SCR)of NOx from power stations,but their poor alkali-resistance restrains the wider application in nonelectrical industries.In this study,NOx reduction against alkali poisoning over V2O5/TiO2 is greatly improved via Ce(SO4)2 modification.It has been originally demonstrated that Ce4+-SO42-pair sites play crucial roles in improving NOx reduction against alkali poisoning over V2O5/TiO2 catalysts.The strong in-teraction between V species and Ce sites of Ce4+-SO42-pairs triggers the reaction between NH4+species and gaseous NO via Eley-Rideal(E-R)reaction pathway.After K-poisoning,the SO42-sites of Ce4+-SO42-pairs as protective sites strongly bond with K and thus maintain the high reaction efficiency via the E-R reaction pathway.This work demonstrates an effective strategy to enhance NOx reduction against alkali poisoning over catalysts via constructing Ce4+-SO42-pair sites,contributing to developing alkali-resistant SCR catalysts for practical application in nonelectrical industries.
基金项目
国家自然科学基金(22125604)
国家自然科学基金(22106100)
国家自然科学基金(21976117)
Shanghai Rising-Star Program(22QA1403700)
Chenguang Program supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(22Z00354)
万方数据