A Mechanistic Model for the Water-Gas Shift Reaction over Noble Metal Substituted Ceria

被引：28
|
作者：
Deshpande, Parag A. [1 ]
Hegde, M. S. [2 ]
Madras, Giridhar [1 ,2 ]
机构：
[1] Indian Inst Sci, Dept Chem Engn, Bangalore 560012, Karnataka, India
[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
来源：
AICHE JOURNAL | 2010年 / 56卷 / 05期
关键词：
water-gas shift reaction; solution combustion technique; hydrogen production; reaction mechanisms; FUEL-CELL APPLICATIONS; NO REDUCTION; CATALYTIC-ACTIVITY; REACTION-KINETICS; HIGH-TEMPERATURE; CARBON-MONOXIDE; CO; OXIDATION; ADSORPTION; PD;
D O I：
10.1002/aic.12062
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
The water-gas shift (WGS) reaction was carried out in the presence of Pd and Pt substituted nanocrystalline ceria catalysts synthesized by solution combustion technique. The catalysts were characterized by powder XRD and XPS. The noble metals were found to be present in ionic form substituted for the cerium atoms. The catalysts showed high activity for the WGS reaction with high conversions below 250 degrees C. The products of reaction were only carbon dioxide and hydrogen, and no hydrocarbons were observed even in trace quantities. The reactions were carried out with different amounts of noble metal ion substitution and 2% Pt substituted ceria was found to be the best catalyst. The various possible mechanisms for the reaction were proposed and tested for their consistency with experimental data. The dual site mechanism best described the kinetics of the reaction and the corresponding rate parameters were obtained. (C) 2009 American Institute of Chemical Engineers AIChE J, 56: 1315-1324, 2010
引用
收藏
页码：1315 / 1324
页数：10
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