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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。
Mesoporous CeO2 (m-CeO2) carrier was synthesized by surfactant block copolymer F127, cetyltrimethylammonium bromide (CTAB) and hexadecylamine (HDA) using ceric ammonium nitrate as the precursor, The effects of the texture properties of m-CeO2 on the catalytic performance of partial oxidation of methanol over Au-Pd bimetallic catalysts were studied. The catalytic performance of the Au-Pd double metal catalysts was studied by HRTEM, XRD, TPR, H2-TPD, CO2- Metal catalysts were characterized. The results show that m-CeO2 (H4) synthesized by HDA as surfactant has larger specific surface area, pore volume and pore size. The H4 supported Au-Pd catalyst shows high catalytic activity and hydrogen selectivity. The characterization results show that Au-Pd / H4 catalyst has higher dispersion of noble metals, more active centers of Au and Pd formed, strong interaction between metal and support, more alkali center on the surface and more desorption of H2 .