过渡金属修饰对Pt/M-DMSN催化剂丙烷脱氢性能的影响  

Influence of Different Transition Metal Decoration on the Propane Dehydrogenation Performance over Pt/M-DMSN Catalysts

作　　者：胡慧敏 崔静 刘丹丹 宋佳欣 张宁 范晓强 赵震 孔莲[1] 肖霞 解则安 HU Huimin;CUI Jing;LIU Dandan;SONG Jiaxin;ZHANG Ning;FAN Xiaoqiang;ZHAO Zhen;KONG Lian;XIAO Xia;XIE Zean(College of Chemistry and Chemical Engineering,Shenyang Normal University,Shenyang 110034,China;State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing 102249,China)

机构地区：[1]沈阳师范大学化学化工学院,沈阳110034 [2]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《高等学校化学学报》2022年第4期124-132,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:22172101,91845201);辽宁省教育厅科学研究经费项目(批准号:LQN202009);沈阳师范大学优秀人才基金和沈阳师范大学重大项目孵化工程项目(批准号:ZD201901)资助.

摘　　要：以两步法制备了一系列过渡金属(M=Fe,Co,Ni,Cu,Zn)修饰的树枝状介孔二氧化硅纳米粒子(DMSN)负载铂(Pt/M-DMSN)催化剂,并对该系列催化剂进行了丙烷催化脱氢性能评价.X射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见漫反射光谱(UV-Vis DRS)和氢气程序升温还原(H2-TPR)表征结果表明,不同过渡金属在DMSN载体表面分散状态不同,且与Pt的相互作用程度不同.其中Zn-DMSN载体最有利于Pt的分散,且反应后催化剂上积碳含量最低;Pt/Fe-DMSN催化剂中Pt与载体的相互作用力较强.通过活性评价结果可知,Pt/FeDMSN催化剂表现出最优的丙烷催化脱氢性能,丙烷初始转化率为44.2%,反应6 h后丙烷转化率仍可达36.5%.A series of transition metal modified dendritic mesoporous silica nanoparticles(DMSN)supported Pt(Pt/M-DMSN,M=Fe,Co,Ni,Cu,Zn)catalysts were prepared by a two-step method.And their catalytic performances were tested for propane dehydrogenation.The XRD,TEM,UV-Vis DRS and H2-TPR characterizations results indi⁃cate the different dispersion state of transition metal on DMSN surface and the different interaction of the transition metal and Pt.Zn-DMSN support shows the most favorable dispersion to Pt,and the lowest coke deposition on the cor⁃responding spent catalyst.Pt/Fe-DMSN catalysts show strong Pt-support interaction.According to the activity test re⁃sults,Pt/Fe-DMSN catalyst shows the best performance for propane dehydrogenation with the propane initial conver⁃sion of 44.2%.And the propane conversion is 36.5%after 6 h reaction.

关 键 词：过渡金属修饰 铂基催化剂 金属-载体相互作用 丙烷脱氢 丙烯 

分 类 号：O643.3[理学—物理化学]