水热法制备杂化型MoO3/CeO2复合催化剂的电化学性能及表面结构

doi:10.3724/SP.J.1077.2012.11665

无机材料学报 ›› 2012, Vol. 27 ›› Issue (9): 939-944.DOI: 10.3724/SP.J.1077.2012.11665

水热法制备杂化型MoO₃/CeO₂复合催化剂的电化学性能及表面结构

黄惠¹, 郭忠诚^1,2

(1. 昆明理工大学冶金与能源工程学院, 昆明 650093; 2. 昆明理工恒达科技有限公司, 昆明 650106)

收稿日期:2011-10-26 修回日期:2012-01-19 出版日期:2012-09-20 网络出版日期:2012-08-28
作者简介:黄惠(1978-), 女, 博士, 讲师. E-mail: huihuanghan@163.com
基金资助:
国家自然科学基金(50974065和51004057); 云南省应用基础研究计划(2011FZ031); 昆明理工大学分析测试基金(2010022)

Surface Structure and Electrochemical Properties of MoO₃/CeO₂ Composite Catalysts by Hydrothermal Method

HUANG Hui¹, GUO Zhong-Cheng^1,2

(1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. Kunming Hendera Science and Technology Co. Ltd, Kunming 650106, China)

Received:2011-10-26 Revised:2012-01-19 Published:2012-09-20 Online:2012-08-28
About author:HUANG Hui.E-mail: huihuanghan@163.com
Supported by:
National Natural Science Foundation (50974065, 51004057); Yunnan Science Foundation (2011FZ031); Analysis & Testing Foundation of Kunming University of Science and Technology (2010022)

摘要/Abstract

摘要： 以CeO₂为载体和钼酸铵为原料, 在70℃下, 采用水热法制备了MoO₃含量分别为0、5wt%、7.5wt%、10wt%、12.5wt%、15wt%和20wt%的杂化型MoO₃/CeO₂复合催化剂. 采用X射线粉末衍射(XRD)、傅立叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电镜(SEM)和X射线能谱仪(EDS)等对所制备催化剂的结构、形貌以及表层MoO₃与CeO₂之间的相互作用进行分析; 并以硫酸溶液水电解为目标反应, 对杂化材料进行了电催化活性测试, 考察MoO₃含量对复合催化剂反应活性的影响. 结果表明, 杂化型MoO₃/CeO₂催化剂的电催化活性明显优于纯CeO₂, 当MoO₃的质量含量为12.5wt%时, 所制备复合催化剂的电催化活性和导电性较佳. 活性提高的主要原因是MoO₃在CeO₂表面上的单层分散阈值在12.5wt%~15wt%之间, MoO₃通过Mo-O-Ce化学键而牢固结合在CeO₂表面, 改善了杂化型MoO₃/CeO₂复合催化剂的表面性能

关键词: 水热法, 三氧化钼, 二氧化铈, 杂化, 催化活性

Abstract: A series of molybdic oxide/ceria (MoO₃/CeO₂) composite catalysts with different MoO₃concentrations (0, 5wt%, 7.5wt%, 10wt%, 12.5wt%, 15wt% and 20wt%) were prepared by hydrolysis of ammonium molybdate and the supports of CeO₂ at 70℃. The crystal structure, the morphology and interaction between MoO₃and CeO₂on the surface of the prepared MoO₃/CeO₂ composite catalysts were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR), X-ray photoelectron spectrometer (XPS), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS), respectively. The catalytic activities of the prepared catalysts were evaluated by the electrolysis sulfuric acid solution. Results show that the catalytic activity of MoO₃/CeO₂ composite catalysts are superior compared with that of pure CeO₂, and the optimal concentration of MoO₃ is12.5wt%. The MoO₃content threshold value of composite catalysts is between 12.5wt% and 15wt%, and it is identified that the Mo-O-Ce bond forms at the interface of MoO₃ and CeO₂in the composite catalysts. Moreover, more surface Mo-O-Ce bond over the MoO₃/CeO₂ composite catalysts will further benefit the improvement of the catalytic activity.

Key words: hydrothermal, molybdic oxide, ceria, composite, catalytic activity

中图分类号:

TG115

黄惠, 郭忠诚. 水热法制备杂化型MoO₃/CeO₂复合催化剂的电化学性能及表面结构[J]. 无机材料学报, 2012, 27(9): 939-944.

HUANG Hui, GUO Zhong-Cheng. Surface Structure and Electrochemical Properties of MoO₃/CeO₂ Composite Catalysts by Hydrothermal Method[J]. Journal of Inorganic Materials, 2012, 27(9): 939-944.

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水热法制备杂化型MoO₃/CeO₂复合催化剂的电化学性能及表面结构

Surface Structure and Electrochemical Properties of MoO₃/CeO₂ Composite Catalysts by Hydrothermal Method

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