CO oxidation catalyzed by gold supported on MgO: Spectroscopic identification of carbonate-like species bonded to gold during catalyst deactivation

MgO-supported gold prepared by adsorption of Au(CH 3) 2(acac) (acac is acetylacetonate) on partially dehydroxylated MgO was activated for CO oxidation catalysis by treatment in flowing helium at 473 K. X-ray absorption spectra showed that the activation involved reduction of the gold and formation o...

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Veröffentlicht in:	Journal of catalysis 2009-01, Vol.261 (2), p.137-149
Hauptverfasser:	Hao, Y., Mihaylov, M., Ivanova, E., Hadjiivanov, K., Knözinger, H., Gates, B.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	ABSORPTION SPECTRA ACID CARBONATES ADSORPTION AGGLOMERATION BUILDUP Carbonate CARBONATES CATALYSIS CATALYSTS Chemistry CO oxidation DEACTIVATION DECOMPOSITION Exact sciences and technology General and physical chemistry GOLD Gold catalyst HELIUM MATERIALS SCIENCE MgO national synchrotron light source OPERATION OXIDATION REDUCTION RESOLUTION SPECTRA Spectrum analysis SUPPORTS Surface physical chemistry Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry X-ray absorption spectroscopy
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Zusammenfassung:	MgO-supported gold prepared by adsorption of Au(CH 3) 2(acac) (acac is acetylacetonate) on partially dehydroxylated MgO was activated for CO oxidation catalysis by treatment in flowing helium at 473 K. X-ray absorption spectra showed that the activation involved reduction of the gold and formation of clusters (with an average diameter
ISSN:	0021-9517 1090-2694
DOI:	10.1016/j.jcat.2008.11.005