| Pt-表层限域的表面FeOx结构用于低温CO氧化反应 |
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| 引用本文： | 徐红,傅强,包信和.Pt-表层限域的表面FeOx结构用于低温CO氧化反应[J].催化学报,2013,34(11):2029-2035. |
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| 作者姓名： | 徐红 傅强 包信和 |
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| 作者单位： | 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连116023 |
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| 基金项目： | supported by the National Natural Science Foundation of China (21222305, 11079005, 20923001);the National Basic Research Program of China (973 Program, 2013CB834603, 2011CBA00503, 2013CB933100)~~ |
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| 摘 要： | 通过简单的浸渍-还原并随后在酸性溶液中处理制备了Pt-Cu双金属催化剂. 利用电感耦合等离子体发射光谱、X射线衍射和X射线光电子能谱对不同处理条件下的Pt-Cu纳米粒子的结构和组成进行了表征. 研究发现, Pt-Cu催化剂在高温H2中还原形成了PtCu3合金结构, 酸洗处理后形成了包含Pt-骨架(Pt-skeleton)的表面结构和PtCu3合金核的纳米粒子. 而Pt-骨架结构又可通过在H2中退火转变为规整的Pt-表层(Pt-skin)结构. Pt-表层表面修饰Fe氧化物后在CO选择氧化反应中表现出较好的催化性能. 通过此方法制备的三金属Pt-Cu-Fe催化剂可达到与Pt-Fe相近的高活性, 并且催化剂中Pt的用量大大降低.
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| 关 键 词： | 一氧化碳氧化 铂-表层 铁氧化物 界面催化 |
| 收稿时间： | 2013-06-06 |
Nanosized FeOx overlayers on Pt-skin surfaces for low temperature CO oxidation |
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| Hong Xu;Qiang Fu;Xinhe Bao.Nanosized FeOx overlayers on Pt-skin surfaces for low temperature CO oxidation[J].Chinese Journal of Catalysis,2013,34(11):2029-2035. |
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| Authors: | Hong Xu;Qiang Fu;Xinhe Bao |
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| Institution: | State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China |
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| Abstract: | Pt-Cu/carbon black catalysts were prepared by an impregnation-reduction method followed by acid leaching. The structure and composition of Pt-Cu nanoparticles treated under different conditions were investigated by inductively coupled plasma atomic emission spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. PtCu3 alloy formed upon annealing Pt-Cu/carbon black catalysts in H2. Acid leaching produced Pt-Cu nanoparticles consisting of Pt-skeleton surface structure and PtCu3 alloy core. The Pt-skeleton could be transformed to well-defined Pt-skin structure through further annealing the leached Pt-Cu nanoparticles in H2. Decorating the Pt-skin surfaces with Fe oxide nanopatches resulted in enhanced reactivity in the preferential oxidation of CO in excess H2. The tri-component Pt-Cu-Fe catalysts exhibited comparable activity to the bi-component Pt-Fe catalysts but used much less Pt. |
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| Keywords: | CO oxidation Pt-skin Fe oxide Interface catalysis |
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