High-Temperature Decomposition of Brønsted Acid Sites in Gallium-Substituted Zeolites

The dehydroxylation of Brønsted acid sites (BAS) in Ga-substituted zeolites was investigated at temperatures up to 850 °C using X-ray absorption spectroscopy (XAS), Fourier transform infrared spectroscopy (FTIR), and mass spectrometry-temperature programmed desorption (MS-TPD). X-ray absorption near...

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Veröffentlicht in:	Journal of physical chemistry. C 2010-11, Vol.114 (45), p.19395-19405
Hauptverfasser:	Al-majnouni, Khalid A, Hould, Nathan D, Lonergan, William W, Vlachos, Dionisios G, Lobo, Raul F
Format:	Artikel
Sprache:	eng
Schlagworte:	C: Surfaces, Interfaces, Catalysis
Online-Zugang:	Volltext
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Zusammenfassung:	The dehydroxylation of Brønsted acid sites (BAS) in Ga-substituted zeolites was investigated at temperatures up to 850 °C using X-ray absorption spectroscopy (XAS), Fourier transform infrared spectroscopy (FTIR), and mass spectrometry-temperature programmed desorption (MS-TPD). X-ray absorption near-edge spectroscopy (XANES) revealed that the majority of gallium has tetrahedral coordination even after complete dehydroxylation. The interatomic gallium−oxygen distance and gallium coordination number determined by extended X-ray absorption fine structure (EXAFS) are consistent with gallium in tetrahedral coordination at low T (
ISSN:	1932-7447 1932-7455
DOI:	10.1021/jp1067523