| MoO_x促进的Pt基催化剂用于低温水汽变换反应(英文) |
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| 引用本文： | 许学俊,傅强,包信和.MoO_x促进的Pt基催化剂用于低温水汽变换反应(英文)[J].催化学报,2015(5):750-756. |
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| 作者姓名： | 许学俊 傅强 包信和 |
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| 作者单位： | 1. 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; 中国科学院大学，北京100049;2. 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(21222305,21321001,21103181);the National Basic Research Program of China(973Program,2013CB834603,2013CB933100,2011CBA00503)~~ |
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| 摘 要： | 通过浸渍还原法制备了不同比例的Pt-Mo/SiO_2催化剂,采用X射线衍射、透射电镜、X射线近边吸收谱和X射线光电子能谱表征了Pt-Mo/SiO_2催化剂的组成、结构及价态.研究结果表明,少量MoO_x修饰Pt-Mo/SiO_2催化剂在低温水汽变换反应中表现出比Pt/SiO_2催化剂更高的催化活性,过量MoO_x包覆的Pt-Mo/SiO_2催化剂活性较低.低温水汽变换反应活性来自于Pt与表面MoO_x的界面协同作用,限域在Pt纳米颗粒表面的MoO_x表现出较低价态,高分散MoO_x纳米岛修饰的Pt纳米颗粒是低温水汽变换反应的活性结构.
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| 关 键 词： | 水汽变换反应 铂 钼氧化物 协同作用 界面催化 |
MoOx-promoted Pt catalysts for the water gas shift reaction at low temperatures |
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| Xuejun Xu
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Qiang Fu
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Xinhe Bao.MoOx-promoted Pt catalysts for the water gas shift reaction at low temperatures[J].Chinese Journal of Catalysis,2015(5):750-756. |
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| Authors: | Xuejun Xu Qiang Fu Xinhe Bao |
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| Institution: | Xuejun Xu;Qiang Fu;Xinhe Bao;State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences; |
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| Abstract: | Pt-Mo/SiO2 catalysts were prepared using impregnation-reduction methods. Mo-promoted Pt cata-lysts exhibit much higher water gas shift reaction activity at low temperatures than Pt/SiO2 cata-lysts. Various characterization methods including inductive coupled plasma atomic emission spec-trometry, X-ray diffraction, transmission electron microscopy, X-ray absorption near edge spec-trum, and X-ray photoelectron spectroscopy were applied to investigate the composition, structure and chemical state of the Pt-Mo/SiO2 catalysts. Our results indicate that the added Mo species effec-tively improves the dispersion of Pt nanoparticles and the synergistic effect between the Pt nano-particles and surface MoOxspecies enhances the catalytic performance for the water gas shift reac-tion. Pt nanoparticles decorated with highly dispersed MoOx patches are found to be the active ar-chitecture. |
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| Keywords: | Water gas shift reaction Platinum Molybdenum oxide Synergistic effect Interface catalysis |
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