Au/CeO_(2)中强金属-载体相互作用的形貌效应  

Morphological effect of strong metal‑support interaction in Au/CeO_(2)

作　　者：韩静茹 孙志敏 李昱[1] 胡执一 HAN Jing‑Ru;SUN Zhi‑Min;LI Yu;HU Zhi‑Yi(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,武汉430070 [2]武汉理工大学纳微结构研究中心,武汉430070

出　　处：《无机化学学报》2023年第9期1682-1690,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家重点研发计划(No.2021YFE0115800);国家自然科学基金(No.U20A20122,52103285)资助。

摘　　要：以Au/CeO_(2)为研究对象,通过构建不同形貌的CeO_(2)载体来研究强金属-载体相互作用(SMSI)的形貌效应。分别以纳米立方块和纳米棒作为载体,通过高分辨(扫描)透射电子显微、光电子能谱、氢程序升温还原等一系列表征方法揭示了CeO_(2)纳米立方块表面更易发生质量传输并形成CeO_(2-x)包覆层。此包覆层大幅抑制了催化剂对小分子气体的吸附能力,并减少了催化活性位点的暴露,对探针反应(丁二烯选择性催化加氢)的催化活性影响显著。以上研究结果表明CeO_(2)纳米立方块比CeO_(2)纳米棒更易构建SMSI体系。Herein,Au/CeO_(2)was synthesized to study the morphological effect on the behavior construction of strong metal‑support interaction(SMSI).Different morphologies of CeO_(2),such as nanocube and nanorod,were selected as catalytic support.A series of characterization including high resolution(scanning)transmission electron microscopy,X‑ray photoelectron spectroscopy,hydrogen temperature programmed reduction(H2‑TPR)and so on,revealed that the mass transfer on nanocube was occurred more easily and the CeO_(2-x)coating on the surface of nanocubes was thicker than nanorod.The CeO_(2-x)coating resulted that the adsorption of small molecules decreased significantly and catalytic active sites were hidden.The influence on probe reaction(selective catalytic hydrogenation activity of butadiene)could be observed clearly.Therefore,the CeO_(2)nanocube was more facile undergo Au‑CeO_(2)SMSI than the nanorod.

关 键 词：强金属-载体相互作用 Au/CeO_(2) 形貌效应 1 3-丁二烯催化加氢 

分 类 号：TB321[一般工业技术—材料科学与工程]