介孔CeO_2载体织构性质对Au-Pd催化剂性能的影响  

Effect of Texture Properties of Mesoporous CeO_2 on the Properties of Supported AuPd Catalysts

作　　者：李苑[1,2] 罗来涛[1] 李长全[3] 

机构地区：[1]南昌大学应用化学研究所,江西南昌330031 [2]江西师范大学化学化工学院,江西南昌330022 [3]南昌大学材料科学与工程学院,江西南昌330031

出　　处：《稀土》2010年第5期37-42,共6页Chinese Rare Earths

基　　金：高等学校博士学科点专项科研基金(20040403011);江西省教育厅科技项目(GJJ08021)

摘　　要：以硝酸铈铵为前驱体,分别采用表面活性剂嵌段共聚物F127、十六烷基三甲基溴化铵(CTAB)和十六胺(HDA)合成介孔CeO2(m-CeO2)载体,研究了m-CeO2织构性质对Au-Pd双金属催化剂甲醇部分氧化制氢性能的影响,并运用HRTEM、XRD、TPR、H2-TPD、CO2-TPD和低温N2吸附等手段对Au-Pd双金属催化剂进行了表征。结果表明,HDA为表面活性剂合成的m-CeO2(H4)具有较大的比表面、孔容和孔径。H4负载的Au-Pd催化剂显示出较高的催化活性和氢气选择性。表征结果表明,Au-Pd/H4催化剂中贵金属的分散度较高、形成的Au、Pd活性中心较多,金属与载体的相互作用较强,表面的碱中心较多,产物H2较易脱附。With ceric ammonium nitrate as cerium precursor,mesoporous CeO2 were prepared from three different templates,the block copolymer F127,hexadecyl trimethyl ammonium bromide（CTAB） and hexadecylamine（HDA）,respectively.And the influence of the texture properties of mesoporous CeO2 on the hydrogen production performance by partial oxidation of methanol over Au-Pd/CeO2 catalysts was studied.The samples were characterized by N2 adsorption,HRTEM,XRD,TPR,H2-TPD and CO2-TPD.The results show that mesoporous CeO2 prepared from template HDA exhibits larger surface area,pore volume and pore size.And the corresponding supported catalyst Au-Pd/H4 shows higher catalytic activity and selectivity of H2.The characterization reveals Au-Pd/H4 has higher dispersion degree of noble metal,more active center of Au and Pd,stronger interaction between metal and carrier,more superficial alkali center as well as weaker adsorption of hydrogen.

关 键 词：甲醇部分氧化 Au-Pd催化剂 介孔CeO2 制氢 

分 类 号：O643.32[理学—物理化学]