Ding Liangbing, Xiong Feng, Jin Yuekang, Wang Zhengming, Sun Guanghui, Huang Weixin
Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, P. R. China.
Phys Chem Chem Phys. 2016 Nov 30;18(47):32551-32559. doi: 10.1039/c6cp05951a.
CeO/Au(110) inverse model catalysts were prepared and their activity toward the adsorption and co-adsorption of O, CO, CO and water was studied by means of X-ray photoelectron spectroscopy, low energy electron diffraction, thermal desorption spectra and temperature-programmed reaction spectra. The Au surface of CeO/Au(110) inverse model catalysts molecularly adsorbs CO, CO and water, and the polycrystalline CeO surface of CeO/Au(110) inverse model catalysts molecularly adsorbs O, and molecularly and reactively adsorbs CO, CO and water. By controllably preparing co-adsorbed surface species on CeO/Au(110) inverse model catalysts, we successfully identified various surface reaction pathways of CO oxidation to produce CO with different barriers both on the CeO surface and at the Au-CeO interface, including CO oxidation by various oxygen species, and water/hydroxyl group-involved CO oxidation. These results establish a surface reaction network of CO oxidation catalyzed by Au/CeO catalysts, greatly advancing the fundamental understandings of catalytic CO oxidation reactions.
制备了CeO/Au(110)反相模型催化剂，并通过X射线光电子能谱、低能电子衍射、热脱附光谱和程序升温反应光谱研究了它们对O、CO、CO和水的吸附及共吸附活性。CeO/Au(110)反相模型催化剂的Au表面分子吸附CO、CO和水，而CeO/Au(110)反相模型催化剂的多晶CeO表面分子吸附O，并分子吸附和反应吸附CO、CO和水。通过可控地在CeO/Au(110)反相模型催化剂上制备共吸附表面物种，我们成功地确定了在CeO表面和Au-CeO界面上CO氧化生成CO的各种具有不同势垒的表面反应途径，包括各种氧物种引发的CO氧化以及水/羟基参与的CO氧化。这些结果建立了Au/CeO催化剂催化CO氧化的表面反应网络，极大地推进了对催化CO氧化反应的基础认识。
