Defect formation and the water-gas shift reaction on [beta]-Ga2O3

The water-gas shift reaction was studied in either direction on [beta]-Ga2O3 samples with different surface chemistries: a fully oxidized surface, a hydrogen-pretreated surface with and without oxygen vacancies present, and an oxygen-defective surface without adsorbed hydrogen. The samples were char...

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Bibliographic Details
Published in:Journal of catalysis 2008-06, Vol.256 (2), p.278
Main Authors: Jochum, Wilfrid, Penner, Simon, Kramer, Reinhard, Föttinger, Karin, Rupprechter, Günther, Klötzer, Bernhard
Format: Article
Language:English
Subjects:
Adsorption
Catalysis
Chemistry
Hydrogen
Oxygen
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Summary:The water-gas shift reaction was studied in either direction on [beta]-Ga2O3 samples with different surface chemistries: a fully oxidized surface, a hydrogen-pretreated surface with and without oxygen vacancies present, and an oxygen-defective surface without adsorbed hydrogen. The samples were characterized by volumetric adsorption measurements and temperature-programmed desorption and reaction techniques. The reaction in both directions was observed to follow two parallel mechanistic pathways, namely formate- and oxygen vacancy-assisted mechanisms, with relative rate contributions depending on temperature and sample pretreatment. [PUBLICATION ABSTRACT]
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2008.03.018