高度分散WO x /SiO2催化剂的制备及烯烃歧化反应性能

Preparation of Highly Dispersed WO x /SiO2 Catalyst and Its Performance in Olefin Disproportionation Reaction

张强 谭昊轩 崔宇超 王焕 张晓彤 宋丽娟

Qiang Zhang Haoxuan Tan Yuchao Cui Huan Wang Xiaotong Zhang Lijuan Song

辽宁石油化工大学 辽宁省石油化工催化科学与技术重点实验室, 辽宁 抚顺 113001 中国石油大学(华东);化学化工学院, 山东 青岛 266555

Key Laboratory of Petrochemical Catalytic Science and Technology，Liaoning Petrochemical University，Fushun Liaoning 113001，China College of Chemistry and Chemical Engineering，China University of Petroleum （East China），Qingdao Shandong 266555，China

通过对WO x /SiO2催化剂载体的筛选和WO x 负载量的考察，成功筛选出一种性能优异的国产SiO2载体，运用氮气物理吸附、XRD、Raman光谱和TEM/EDS对催化剂结构进行表征，考察了WO x 物种在载体上的分散情况和乙烯与丁烯歧化制丙烯的催化反应性能，并与国外某商业催化剂的性能进行了对比。结果表明，当国产载体S?SiO2的WO x 负载量阈值为8%时，催化剂显示出最佳催化活性和选择性；与商业催化剂的催化性能相比，其催化活性高近10%，且稳定性和选择性相当；关联结构表征结果证实，WO x 物种在载体上的分散特征是影响催化性能的关键因素，SiO2载体和负载量也是影响WO x 物种分散状态的关键。本研究可为高效烯烃歧化反应WO x /SiO2催化剂的国产化，尤其是国产SiO2载体的选择提供依据。

This paper carried out the screening of WO x /SiO2 catalyst carrier and the investigation of WO x loading capacity, and successfully screened a domestic SiO2 carrier with excellent performance. The structure and properties of the catalyst were characterized by nitrogen physical adsorption, XRD, Raman spectroscopy and TEM/EDS. The dispersion of WO x species on the carrier was mainly investigated, the catalytic reaction performance of disproportionation of ethylene and butene to propylene was investigated, and the performance was compared with that of a foreign commercial catalyst. The research results show that the WO x loading threshold of the domestic carrier S?SiO2 is 8%. At this time, the catalyst shows the best catalytic activity and selectivity. Compared with the catalytic performance of the comparative commercial catalyst, the catalyst activity is nearly 10% higher, and the stability and selectivity are equivalent, and the correlation structure characterization results can confirm that the dispersion characteristics of WO x species on the support are the key factors that affect the catalytic performance, while the SiO2 support and loading are both the key to the dispersion state of WO x species. This study can provide a basis for the localization of WO x /SiO2 catalysts for high?efficiency olefin disproportionation reactions, especially the selection of domestic SiO2 carriers.

国家自然科学基金项目(U1908203);辽宁省教育厅科学研究经费优青培育计划项目(L2019035)

10.3969/j.issn.1672-6952.2022.05.005