铁铈氧化物SCR脱硝催化剂的制备及性能

采用浸渍法制备了CeO₂-Fe₂O₃/TiO₂催化剂,研究了CeO₂负载量对其选择催化还原NO性能的影响,并将其中效果最好的催化剂按照同样组分配比采用溶胶凝胶法制备进行比较。采用BET、XRD、SEM和XPS等手段对催化剂进行表征。实验结果表明,采用浸渍法制备的负载10%CeO₂、3%Fe₂O₃的催化剂脱硝效率最优,最高可达96.65%。采用溶胶凝胶法制备催化剂效率更优,最高为99.36%。结果表明,浸渍法和溶胶凝胶法制备的10%-3%CeO₂-Fe₂O₃/TiO₂催化剂均具有较大的比表面积、活性成分分散度好、储氧能力强等优点。

Preparation of Fe-Ce oxide SCR denitration catalyst and its performance study

A CeO₂-Fe₂O₃/TiO₂ catalyst was prepared by impregnation method. The effect of CeO₂ loading on the selective catalytic reduction of NO was studied. As a comparison, the catalyst in same optimum component proportion as above catalyst was also prepared by sol gel method. The BET, XRD, SEM and XPS were used for the catalyst characterization. The experimental results show that the catalyst of 10% CeO₂ and 3% Fe₂O₃ by impregnation method has an optimal performance up to the reduction efficiency of 96.65%. The catalyst by sol gel method has better denitration performance than that by impregnation method, reaching 99.36% of efficiency. The characterization results show that all the 10%-3%CeO₂-Fe₂O₃/TiO₂ catalysts made by impregnation method or by sol gel method have the advantages of larger specific surface area, better dispersity of active ingredient, and better oxygen storage capacity.