Vibrational spectroscopy of bulk and supported manganese oxides

被引:447
作者
Buciuman, F [1 ]
Patcas, F [1 ]
Craciun, R [1 ]
Zahn, DRT [1 ]
机构
[1] Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany
关键词
D O I
10.1039/a807821a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Manganese oxide catalysts, both bulk and supported on gamma-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 beta-MnO2 and alpha-Mn2O3 phases, other signals were assigned to isolated Mn2+ ions accommodated in tetrahedral vacancies on the support surface and to some epitaxial layers of gamma-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.
引用
收藏
页码:185 / 190
页数:6
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