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)).
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)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
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)。
关键词
介-大孔复合载体
钯
氧化铝
催化剂
催化加氢
meso-macroporous carrier
palladium
alumina
catalyst
catalytic hydrogenation
