Pd-Ag合金纳米粒子合成及其催化性能研究  

Synthesis and catalysis of Pd-Ag alloy nanoparticle

作　　者：卫国宾[1] 宋燕红 卢红亮[1] Wei Guobin;Song Yanhong;Lu Hongliang(SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013)

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《化工新型材料》2018年第11期193-197,201,共6页New Chemical Materials

摘　　要：采用W/O微乳液法合成Pd-Ag合金纳米粒子并结合微乳浸渍工艺制备了负载型Pd-Ag/Al_2O_3催化剂。利用紫外-可见分光光度计和透射电子显微镜对合成的Pd-Ag合金纳米粒子进行表征,并考察了对乙炔加氢反应的催化性能。结果表明,在聚氧乙烯(4)月桂醚(Brij30)/正辛烷/水微乳液体系中加入聚乙烯基吡咯烷酮(PVP),对生成的纳米粒子起到二次保护作用,Pd与Ag以合金纳米粒子形式稳定存在且粒径大小均一,粒径在1～2nm,可随PVP以薄膜形态负载并分散在Al_2O_3表面。当PVP相对分子质量为8000～10000,cPVP8:c(Pd+Ag)=0.1时,合成的Pd-Ag合金纳米粒子数量最多,粒径最小,制备的Pd-Ag/Al_2O_3催化剂具有良好的乙炔加氢活性和选择性。Pd-Ag alloy nanoparticles were synthesized by W/O microemulsion method and then deposited on Al2O3to form the supported catalyst by microeraulsion impregnation technology.The nanoparticles of sample were characterized by UV/Vis,and HRTEM.Their catalytic performances were investigated by the acetylene selectivity hydrogenation.The results indicated that uniform Pd-Ag bimetallic alloy nanoparticles with the minimum size of 1-2nm were formed in the measured area of microemulsion.The growth of nanoparticles was effectively limited by both the droplet size of microemulsion and the protection of PVP added into the system Brij30/n-octance/water.The size stability of particles was enhanced.Pd-Ag alloy nanoparticles were well dispersed on Al2O3support with the thin PVP film form.The number of particles synthesized was the most and theparticle size was the smallest when the molecular weight of PVP was 8000~10000,and CPVP8: C(Pd+Ag)was 0.1.High acetylene conversion and selectivity to ethylene for acetylene hydrogenation was achieved on the catalyst Pd-Ag/Al2O3.

关 键 词：微乳液 聚乙烯基吡咯烷酮 乙炔加氢 合金纳米粒子 负载催化剂 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O643.36[理学—物理化学]