Pd-Ag/Al_2O_3催化剂的制备及性能  

Preparation and properties of Pd-Ag/Al_2O_3 catalysts

作　　者：卫国宾[1] 穆玮[1] 赵晓玮 Wei Guobin1, Mu Wei1, Zhao Xiaowei2(1. Sinopec Beijing Research Institute of Chemical Industry, Beijing 100013, China 2. Beijing Shun＇an Qite Gas Co. Ltd., Beijing 101300, China)

机构地区：[1]中国石化北京化工研究院,北京100013 [2]北京顺安奇特气体有限公司,北京101300

出　　处：《石油化工》2018年第8期788-794,共7页Petrochemical Technology

摘　　要：通过拟三元相图摸索合成了Brij30(聚氧乙烯(4)月桂醚)/正辛烷/PVP(聚乙烯基吡咯烷酮)微乳液体系,利用微乳浸渍技术制备了Pd-Ag/Al_2O_3催化剂,采用SEM、H_2-TPR及等温H_2变压吸附等分析手段对催化剂进行表征,并将制备的催化剂用于乙炔加氢反应中,考察了不同方法制备的催化剂在乙炔选择加氢反应中的催化性能。实验结果表明,相对分子质量在3 500~10 000的PVP微乳液最大增溶水量达34.96%~40.03%,可用于Pd-Ag合金纳米粒子合成反应中;所制备的催化剂中Pd-Ag合金呈高分散形态分布于载体表面,且与载体之间的作用力较弱,Pd对氢的吸附能力被改变;Brij30/正辛烷/PVP微乳液体系制备的催化剂中Ag/Pd摩尔比最低,催化剂的加氢活性和选择性最佳。The characteristics of Brij30/n-octane/polyvinyl pyrrolidone（PVP）microemulsion system were wholly studied by drawing pseudo-triangle phase diagrams.Pd-Ag/Al2O3 catalysts were prepared by microemulsion impregnation technology.The prepared catalysts were characterized by H2-TPR,H2isothermal adsorption,SEM,and applied to acetylene hydrogenation.The catalytic performances of various catalysts prepared by different methods were investigated on acetylene selective hydrogenation.The results indicated that the largest water solubilization was 34.96%-40.03%in the Brij30/n-octane/PVP（M=3 500-10 000）system which could be applied to the synthesis of Pd-Ag alloy nanoparticles.The Pd-Ag alloy particles of the prepared catalyst were highly dispersed on the surface of the support and weakened interactions with the support.The hydrogen adsorption capacity of Pd was changed.The lowest Ag/Pd mole ratio,the highest acetylene conversion and the highest selectivity were achieved on the supported catalyst prepared by the system of Brij30/n-octane/PVP.

关 键 词：微乳液 聚乙烯基吡咯烷酮 乙炔加氢 碳二馏分 选择加氢 

分 类 号：TQ426[化学工程]