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Water gas shift reaction over multi-component ceria catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
46156 46430 2012 12 PDF Available
Title
Water gas shift reaction over multi-component ceria catalysts
Abstract

This study reports the activity of ionic substituted bimetallic Cu-Ni-modified ceria and Cu-Fe-modified ceria catalysts for low-temperature water gas shift (WGS) reaction. The catalysts were synthesized in nano-crystalline size by a sonochemical method and characterized by XRD, TEM, XPS, TPR and BET surface analyzer techniques. Due to the ionic substitution of these aliovalent base metals, lattice oxygen in CeO2 is activated and these catalysts show high activity for WGS at low temperature. An increase in the reducibility and oxygen storage capacity of bimetallic substituted CeO2, as evidenced by H2-TPR experiments, is the primary reason for the higher activity towards WGS reaction. In the absence of feed CO2 and H2, 100% conversion of CO with 100% H2 selectivity was observed at 320 °C and 380 °C, for Cu-Ni-modified ceria and Cu-Fe-modified ceria catalysts. Notably, in the presence of feed H2O, a reverse WGS reaction does not occur over these ceria modified catalysts. A redox reaction mechanism, involving oxidation of CO adsorbed on the metal was developed to correlate the experimental data and determine kinetic parameters.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights▸ Cu-Ni and Cu-Fe modified ceria catalysts were synthesized and characterized. ▸ Relation between catalyst activity and oxygen storage capacity was explored. ▸ Cyclic reoxidation and high oxygen storage capacity were observed. ▸ A new model was proposed to correlate the experimental data.

Keywords
Water gas shift; Ceria supported catalyst; Oxygen storage capacity; Reaction mechanism
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 123–124, 23 July 2012, Pages 367–378
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us