摘要
采用湿浸渍法制备了不同负载量的WO_(x)/SBA-15催化剂,讨论了WO_(x)分散性对烯烃歧化反应的影响。结果表明,负载量影响了WO_(x)在载体表面的分散度,进而影响催化活性;负载量10%的催化性能最佳;高负载量的WO_(x)/SBA-15表面聚集态WO_(x)数目较多,掩盖了活性位点。采用物理吸附、XRD、SEM表征样品织构性质,采用吡啶红外、化学吸附表征了样品的酸性和酸量。反应评价显示10%负载量的10%WO_(x)/SBA-15催化活性最佳,丙烯收率可达50%,丙烯选择性近90%。
WO_(x)/SBA-15 catalysts with different loading amounts were prepared by wet impregnation method,and the effect of WO_(x) dispersion on the olefin disproportionation reaction was discussed.The results show that the loading amount affects the dispersion of WO_(x) on the carrier surface,as well as the catalytic activity.The best catalytic performance of WO_(x)/SBA-15 can be achieved with 10% loading amount of WO_(x).The higher loading amount of WO_(x) could induce aggregation of WO_(x) on the SBA-15surface,and then covering the active sites.The weaving properties of the samples were characterized by physical adsorption,XRD,SEM,and the acidity and acid amount of the samples were characterized by pyridine IR and chemisorption.Reaction evaluation shows that the sample with 10% loading amount of WO_(x) exhibits the best catalytic activity.The propylene yield of the 10% WO_(x)/SBA-15 catalyst is up to 50% and the propylene selectivity is nearly 90%.
作者
崔宇超
秦玉才
王文燕
吴薇
张强
宋丽娟
Cui Yuchao;Qin Yuchai;Wang Wenyan;Wu Wei;Zhang Qiang;Song Lijuan(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China;Daqing Chemical Research Center of Petrochemical Research Institute,PetroChina,Daqing Heilongjiang 163714,China)
出处
《石油化工高等学校学报》
CAS
2022年第1期23-28,共6页
Journal of Petrochemical Universities
基金
国家自然科学基金资助项目(No.U1662135,213761114)。
关键词
浸渍法
分散度
烯烃歧化
催化活性
Impregnation method
Olefin disproportionation
Dispersion
Catalytic activity
