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

Deshpande, Parag A and Hegde, MS and Madras, Giridhar (2010) A Mechanistic Model for the Water-Gas Shift Reaction over Noble Metal Substituted Ceria. In: AIChE Journal, 56 (5). pp. 1315-1324.

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Abstract

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 highactivity 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.

Item Type:	Journal Article
Publication:	AIChE Journal
Publisher:	American Institute of Chemical Engineers
Additional Information:	Copyright of this article belongs to American Institute of Chemical Engineers.
Keywords:	water-gas shift reaction; solution combustion technique; hydrogen production; reaction mechanisms
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Mechanical Sciences > Chemical Engineering
Date Deposited:	04 Jun 2010 05:46
Last Modified:	19 Sep 2010 06:06
URI:	http://eprints.iisc.ac.in/id/eprint/27723

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