高温水热处理对Zn/S-1催化剂PDH性能的影响  

Effect of high-temperature hydrothermal treatment on Zn/S-1 catalytic properties of PDH reaction

作　　者：朱金权 陈永东[1] 赵银峰[2] ZHU Jinquan;CHEN Yongdong;ZHAO Yinfeng(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610599,Sichuan,China;National Engineering Laboratory for Methanol to Olefins,Dalian National Laboratory for Clean Energy,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610599 [2]中国科学院大连化学物理研究所,清洁能源大连国家实验室,甲醇制烯烃国家工程实验室,辽宁大连116023

出　　处：《工业催化》2024年第11期73-79,共7页Industrial Catalysis

摘　　要：通过对Zn基Silicalite-1(S-1)催化剂进行不同温度水热处理,探究高温水热处理对催化剂性质及其丙烷直接脱氢(PDH)性能的影响。高温水热处理后催化剂丙烷转化率由68.49%降低到1.42%。利用XRD、SEM、TEM、氮气物理吸附、DR UV-vis、XPS、NH_(3)-TPD、Py-IR对样品进行表征。结果表明,ZnO与S-1分子筛键合形成Zn-O-Si键,高温水热处理会破坏Zn-O-Si键,使ZnO与分子筛相互作用减弱,ZnO颗粒发生聚集,粒径增大,同时Lewis酸(L酸)含量减少,导致催化剂PDH催化性能降低。In this paper,hydrothermal treatment of Zn-based Silicalite-1(S-1)catalyst at different temperatures was performed to explore the effect of high-temperature hydrothermal treatment on the catalyst and its propane direct dehydrogenation(PDH)performance.After high-temperature hydrothermal treatment,the propane conversion of the catalyst decreased from 68.49%to 1.42%.The samples were characterized by XRD,SEM,TEM,N 2 physisorption,DR UV-vis,XPS,NH_(3)-TPD,and Py-IR techniques.The results indicate that ZnO forms Zn-O-Si bonds with the S-1 molecular sieve and high-temp erature hydrothermal treatment disrupts the Zn-O-Si bonds,which results in the aggregation of ZnO particles and an increase in particle size.Simultaneously,the Lewis acid(L-acid)content decreases,leading to a decrease in the catalytic performance of the catalyst for the PDH reaction.

关 键 词：催化剂工程 丙烷直接脱氢 ZnO纳米颗粒 S-1分子筛 高温水热处理 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]