Morphology effect of Ru/CeO2 catalysts for the catalytic combustion of chlorobenzene

被引：431
作者：
Huang, Hao [1 ]
Dai, Qiguang [1 ]
Wang, Xingyi [1 ]
机构：
[1] E China Univ Sci & Technol, Res Inst Ind Catalysis, Adv Mat Lab, Shanghai 200237, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2014年 / 158卷
基金：
中国国家自然科学基金;
关键词：
Ceria; Ruthenium; Chlorobenzene; Catalytic combustion; Crystal plane dependence; LOW-INDEX SURFACES; H-TYPE ZEOLITES; IN-SITU RAMAN; ELECTRONIC-STRUCTURE; CEO2; NANOCRYSTALS; CHLORINATED VOCS; NANOSCALE CERIA; SOLID-SOLUTIONS; DEFECT SITES; OXIDATION;
D O I：
10.1016/j.apcatb.2014.01.062
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The present work elucidated the morphology and crystal-plane effects of nanoscale ceria on the activity of Ru/CeO2 catalysts toward catalytic combustion of chlorobenzene taken as a model of chlorinated aromatic hydrocarbons (CAHs). CeO2 nanorods (CeO2-r), nanocubes (CeO2-c) and nano-octahedra (CeO2-o) (enclosed by {110} and {100}, {100} and {111}, respectively) as supports, were prepared by wet impregnation. The status and structure of Ru species is quite dependent on the enclosed various facets. Ru/CeO2-r possesses much more Ru4+, oxygen vacancies and Ru-O-Ce bonds than Ru/CeO2-c and Ru/CeO2-o, indicating that there is a stronger interaction between Ru and CeO2-r. The surface oxygen mobility and reducibility follow the order of Ru/CeO2-r > Ru/CeO2-c > Ru/CeO2-o. The activity test of chlorobenzene oxidation shows that Ru/CeO2-r is more active than that of Ru/CeO2-c and Ru/CeO2-o, with T-10% and T-90% of 160 and 280 degrees C, respectively, which can be related to a larger number of Ru-O-Ce bonds, higher content of Ru4+ and surface oxygen mobility and reducibility. These results confirm that the activity of Ru/CeO2 catalysts for CB oxidation is greatly affected by CeO2 shape/crystal plane. (C) 2014 Published by Elsevier B.V.
引用
收藏
页码：96 / 105
页数：10
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