ChemInform Abstract: Vibrational Spectroscopy of Bulk and Supported Manganese Oxides

Autor:	Florina Buciuman, Florin Patcas, Radu Craciun, Dietrich R. T. Zahn
Rok vydání:	2010
Předmět:	Silicon Analytical chemistry chemistry.chemical_element Infrared spectroscopy General Medicine Manganese Silicate Catalysis chemistry.chemical_compound symbols.namesake chemistry Aluminium symbols Atomic ratio Raman spectroscopy
Zdroj:	ChemInform. 30
ISSN:	1522-2667 0931-7597
DOI:	10.1002/chin.199911021
Popis:	Manganese oxide catalysts, both bulk and supported on γ-Al2O3 and SiO2, have been studied by Raman and FTIR spectroscopies, their phase composition being determined by X-ray diffraction. The supported catalysts were prepared via pore volume impregnation from nitrate precursors, the atomic ratio of manganese to aluminium and silicon, respectively, being in the range from 0.5/100 to 18/100. The use of Raman analysis in the microscopic configuration allowed the spectra to be taken at different points of the surface and revealed the inhomogeneity of the catalyst. Besides the Raman features of the β-MnO2 and α-Mn2O3 phases, other signals were assigned to isolated Mn2+ ions accommodated in tetrahedral vacancies on the support surface and to some epitaxial layers of γ-Mn2O3 and manganese silicate, respectively. The FTIR spectra, though not as useful because of the strong bands of the support that overlap those of manganese oxides, support these findings.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::63ea3092610836e5b62547715f9b92fc https://doi.org/10.1002/chin.199911021 Zobrazit plný text záznamu Plný text