| Pt/CeO2/SBA-15催化剂上Pt-CeO2接触界面的相互作用 |
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| 引用本文： | 毕亚东,张微,徐恒泳,李文钊.Pt/CeO2/SBA-15催化剂上Pt-CeO2接触界面的相互作用[J].高等学校化学学报,2009,30(10):2032-2035. |
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| 作者姓名： | 毕亚东 张微 徐恒泳 李文钊 |
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| 作者单位： | 中国科学院大连化学物理研究所应用催化研究室,大连,116023 |
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| 摘 要： | 通过沉积沉淀法(Deposition precipitation, DP)将CeO2纳米粒子高度分散在SBA-15分子筛上, 进一步采用浸渍法负载Pt后制备了 Pt/CeO2/SBA-DP催化剂. 紫外-可见漫反射光谱分析表明, 在Pt/CeO2/SBA-DP催化剂上可以形成更多的Pt-CeO2接触界面, 有利于从CeO2到Pt的电子转移过程. CO程序升温还原(CO-TPR)测试证实, Pt/CeO2/SBA-DP催化剂上CeO2表面氧物种具有较高的还原能力.
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| 关 键 词： | 氧化铈 SBA-15分子筛 铂 紫外-可见漫反射光谱 CO程序升温还原 |
| 收稿时间： | 2008-12-05 |
Interaction at Pt-CeO_2 Contact Interface over Pt/CeO_2/SBA-15 Catalyst |
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| BI Ya-Dong,ZHANG Wei,XU Heng-Yong,LI Wen-Zhao.Interaction at Pt-CeO_2 Contact Interface over Pt/CeO_2/SBA-15 Catalyst[J].Chemical Research In Chinese Universities,2009,30(10):2032-2035. |
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| Authors: | BI Ya-Dong ZHANG Wei XU Heng-Yong LI Wen-Zhao |
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| Institution: | BI Ya-Dong,ZHANG Wei,XU Heng-Yong,LI Wen-Zhao(Applied Catalysis Laboratory,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China) |
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| Abstract: | A high dispersion of CeO2 within the pores of an SBA-15 mesoporous silica was achieved via deposition precipitation(DP) method,and Pt/CeO2/SBA-15 catalyst was prepared by further depositing Pt on CeO2-modified SBA-15.UV-Vis diffuse reflectance spectra show that intimate contact is formed at Pt-CeO2 interface,which is in favor of the transfer of electrons from CeO2 to Pt and formation of oxygen vacancies.The CO temperature-programmed reduction(CO-TPR) verified the enhanced reducibility of the surface oxygen ... |
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| Keywords: | CeO2 SBA-15 molecular sieve Pt UV-Vis diffuse reflectance spectrum CO temperature-programmed reduction |
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