Au/CeO2中强金属-载体相互作用的形貌效应

以Au/CeO₂为研究对象，通过构建不同形貌的CeO₂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CeO₂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CeO₂纳米立方块比CeO₂纳米棒更易构建SMSI体系。

Morphological effect of strong metal-support interaction in Au/CeO2

Herein, Au/CeO₂ was synthesized to study the morphological effect on the behavior construction of strong metal-support interaction (SMSI). Different morphologies of CeO₂, 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 CeO₂ nanocube was more facile undergo Au-CeO₂ SMSI than the nanorod.