MoOx促进的Pt基催化剂用于低温水汽变换反应

doi:10.1016/S1872-2067(14)60294-1

催化学报 ›› 2015, Vol. 36 ›› Issue (5): 750-756.DOI: 10.1016/S1872-2067(14)60294-1

MoO_x促进的Pt基催化剂用于低温水汽变换反应

许学俊^a,b, 傅强^a, 包信和^a

a 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;
b 中国科学院大学, 北京100049

收稿日期:2014-12-15 修回日期:2015-01-19 出版日期:2015-04-17 发布日期:2015-04-17
通讯作者: Qiang Fu
基金资助:
国家自然科学基金(21222305, 21321001, 21103181); 国家重点基础研究发展计划(973计划, 2013CB834603, 2013CB933100, 2011CBA00503).

MoO_x-promoted Pt catalysts for the water gas shift reaction at low temperatures

Xuejun Xu^a,b, Qiang Fu^a, Xinhe Bao^a

a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-12-15 Revised:2015-01-19 Online:2015-04-17 Published:2015-04-17
Contact: Qiang Fu
Supported by:
This work was supported by the National Natural Science Foundation of China (21222305, 21321001, 21103181), and the National Basic Research Program of China (973 Program, 2013CB834603, 2013CB933100, 2011CBA00503).

摘要/Abstract

摘要：

通过浸渍还原法制备了不同比例的Pt-Mo/SiO₂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/SiO₂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/SiO₂催化剂在低温水汽变换反应中表现出比Pt/SiO₂催化剂更高的催化活性, 过量MoO_x包覆的Pt-Mo/SiO₂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.

关键词: 水汽变换反应, 铂, 钼氧化物, 协同作用, 界面催化

Abstract:

Pt-Mo/SiO₂ catalysts were prepared using impregnation-reduction methods. Mo-promoted Pt catalysts exhibit much higher water gas shift reaction activity at low temperatures than Pt/SiO₂ catalysts. Various characterization methods including inductive coupled plasma atomic emission spectrometry, X-ray diffraction, transmission electron microscopy, X-ray absorption near edge spectrum, 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 effectively improves the dispersion of Pt nanoparticles and the synergistic effect between the Pt nanoparticles and surface MoO_x species enhances the catalytic performance for the water gas shift reaction. Pt nanoparticles decorated with highly dispersed MoO_x patches are found to be the active architecture.

Key words: Water gas shift reaction, Platinum, Molybdenum oxide, Synergistic effect, Interface catalysis

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[J]. 催化学报, 2015, 36(5): 750-756.

Xuejun Xu, Qiang Fu, Xinhe Bao. MoO_x-promoted Pt catalysts for the water gas shift reaction at low temperatures[J]. Chinese Journal of Catalysis, 2015, 36(5): 750-756.

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MoO_x促进的Pt基催化剂用于低温水汽变换反应

MoO_x-promoted Pt catalysts for the water gas shift reaction at low temperatures

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MoOx促进的Pt基催化剂用于低温水汽变换反应

MoOx-promoted Pt catalysts for the water gas shift reaction at low temperatures

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MoO_x促进的Pt基催化剂用于低温水汽变换反应

MoO_x-promoted Pt catalysts for the water gas shift reaction at low temperatures