多级孔氧化铝负载钯催化剂的制备及加氢性能研究  

Preparation and hydrogenation performance of multi-stage porous alumina supported palladium catalysts

作　　者：孙航 肖佩荣 陶艳琪 勇晓龙 王琪 崔鹏 SUN Hang;XIAO Peirong;TAO Yanqi;YONG Xiaolong;WANG Qi;CUI Peng(School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]合肥工业大学化学与化工学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2021年第8期1106-1110,1125,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(21106027)。

摘　　要：文章以聚甲基丙烯酸单酯(PMMA)微球为模板剂,采用三嵌段共聚物F127辅助胶体晶体模板的方法合成介-大孔复合孔道结构的Al_(2)O_(3)载体,通过浸渍还原法制备了Pd/3DOM Al_(2)O_(3)负载型催化剂,考察了其在苯乙烯加氢反应中的活性。采用氮气物理吸附-脱附(N2-BET)、场发射扫描电子显微镜(field emission scanning electron microscope,FESEM)、高分辨率透射电子显微镜(high resolution transmission electron microscope,HRTEM)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)等分析方法对催化剂进行了表征。结果表明:活性物种主要以Pd0的形式高度分散在3DOM Al_(2)O_(3)载体上;开放有序的多级孔结构有利于反应物和产物在孔道内的扩散,使其在苯乙烯加氢反应中的活性优于相同条件下γ-Al_(2)O_(3)负载的Pd催化剂,Pd/3DOM Al_(2)O_(3)的转换频率(turnover frequency,TOF)值可达0.56 s^(-1),高于Pd/γ-Al_(2)O_(3)的0.45 s^(-1)。Meso-macroporous Al_(2)O_(3) was synthesized with PMMA microsphere as template agent and F127 as colloid crystal template.Pd/3DOM Al_(2)O_(3) catalysts were prepared by impregnation and reduction method.And the catalytic hydrogenation performance of styrene was investigated.The catalysts were characterized by nitrogen adsorption-desorption(N2-BET),field emission scanning electron microscope(FESEM),high resolution transmission electron microscope(HRTEM)and X-ray photoelectron spectroscopy(XPS).The results show that the active species were highly dispersed on 3DOM Al_(2)O_(3) carrier as Pd0.The open and ordered multi-stage pore structure is conducive to the diffusion of reactants and products in the pore passage,which makes the activity of Pd/3DOM Al_(2)O_(3) better than that of Pd/γ-Al_(2)O_(3) under the same conditions,the turnover frequency(TOF)value of Pd/3DOM Al_(2)O_(3) is 0.56 s^(-1),higher than that of Pd/γ-Al_(2)O_(3)(0.45 s^(-1)).

关 键 词：介-大孔复合载体 钯 氧化铝 催化剂 催化加氢 

分 类 号：O643.38[理学—物理化学]