化工进展2025，Vol.44Issue(3)：1368-1377,10.DOI:10.16085/j.issn.1000-6613.2024-0389
Sn掺杂Cu/CeZrO2/γ-Al2O3对三效催化(TWC)反应的作用:提高低温活性和抗硫性
Role of the Sn dopant on Cu/CeZrO2/γ-Al2O3 three-way catalyst:Enhancement of low-temperature activity and sulfur resistance
摘要
Abstract
The high activity and durability of three-way catalysts are key factors allowing vehicle exhaust emission to meet the increasingly stringent standards.However,SO2 in exhaust gas is easily adsorbed by the three-way catalysts,leading to their deactivation.Cu/CeZrO2/γ-Al2O3 and Cu/CeZrSnO2/γ-Al2O3 catalysts were prepared by an impregnation method and tested for three-way catalytic performance and SO2 resistance.The results showed that the Sn-doped catalysts exhibited high three-way catalytic performance and SO2 resistance.A combination of XRD,H2-TPR,O2-TPD,XPS,SO2-TPD and TG characterization confirmed that Sn doping induced the generation of abundant Ce3+and more oxygen vacancies,and accelerated the lattice oxygen migration,which led to the participation of a large amount of surface adsorbed oxygen in the catalytic reaction.In addition,Sn doping contributed to the generation of unsaturated sites that could accept electrons from Cu+,thus promoting the formation of Cu2+.Moreover,Cu2+as the active site of the three-way catalytic reaction,had a high adsorption energy when it was in contact with SO2,which effectively attenuates the adsorption of SO2 on Cu/CeZrSnO2/γ-Al2O3,and further protects the active component of three-way catalyst from sulfurization while improving the catalytic efficiency.关键词
催化剂/活性/吸附/Sn掺杂/SO2抗性Key words
catalyst/reactivity/adsorption/Sn doping/SO2 resistance分类
资源环境引用本文复制引用
陈宇航,李巧艳,梁美生,宋天远,汪玥,李思萌,周宇璇..Sn掺杂Cu/CeZrO2/γ-Al2O3对三效催化(TWC)反应的作用:提高低温活性和抗硫性[J].化工进展,2025,44(3):1368-1377,10.基金项目
山西省基础研究计划(202203021211140,20210302124131). （202203021211140,20210302124131）
