Structural study of surface tungstate in WO3Al2O3: Effects of Hydration and 18O Exchange

Autor:	John M. Stencel, J. Rodney Diehl, L. E. Makovsky, Tom A. Sarkus
Rok vydání:	1984
Předmět:	Inorganic chemistry Mass spectrometry law.invention Catalysis symbols.namesake chemistry.chemical_compound Tungstate chemistry law Raman band symbols General Materials Science Calcination Raman spectroscopy Spectroscopy
Zdroj:	Journal of Raman Spectroscopy. 15:282-287
ISSN:	0377-0486
DOI:	10.1002/jrs.1250150415
Popis:	The Raman spectra of a series of WO3AI2O3 catalysts containing 1-30 wt-% of WO3 were investigated with respect to the effect of O2 calcination and H2OD2O exposure. These studies showed that the frequencies of bands due to surface tungstate species can be shifted reversibly by as much as 6% of their values during alternate O2 calcination and H2O exposure cycles. The exchange of 18O for l6O in the surface tungstate was also investigated with Raman spectroscopy and ion-scattering spectrometry. The results were used to assign Raman bands to fundamental vibrations of the surface tungstate and to propose a mechanism of interaction between H2O and the surface tungstate that hitherto has not been addressed for WO3AI2O3.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d5eadc12d469d13f60ab6f9477f802e2 https://doi.org/10.1002/jrs.1250150415 Zobrazit plný text záznamu Plný text