Changing the Oxygen Mobility in Co/Ceria Catalysts by Ca Incorporation: Implications for Ethanol Steam Reforming

The effect of calcium doping on the performance of Co/CeO2 catalysts in ethanol steam reforming was examined using various characterization techniques including CO temperature-programmed reduction, O2 and CO pulse chemisorption, laser Raman spectroscopy, X-ray diffraction, isotopically labeled oxyge...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2010-03, Vol.114 (11), p.3796-3801
Main Authors: Song, Hua, Ozkan, Umit S
Format: Article
Language:English
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Summary:The effect of calcium doping on the performance of Co/CeO2 catalysts in ethanol steam reforming was examined using various characterization techniques including CO temperature-programmed reduction, O2 and CO pulse chemisorption, laser Raman spectroscopy, X-ray diffraction, isotopically labeled oxygen exchange, and diffuse reflectance infrared Fourier transform spectroscopy. Characterization results showed Ca incorporation to lead to oxygen vacancies and unit cell expansion in the ceria lattice. The creation of oxygen vacancies, in turn, enhanced the oxygen mobility in ceria-supported Co catalysts. Steady-state reaction studies showed increased TOF and higher H2 yields over Co catalysts supported on Ca-doped ceria in ethanol steam reforming.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp905608e