Premium
Photoelectron spectroscopy (XPS) and thermogravimetry (TG) of pure and supported rhenium oxides. 3. Rhenium Oxides on Magnesium Oxide
Author(s) -
Cimino A.,
Gazzoli D.,
Minelli G.,
Valigi M.
Publication year - 1982
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19824940127
Subject(s) - x ray photoelectron spectroscopy , rhenium , oxide , magnesium , thermogravimetry , perrhenate , inorganic chemistry , chemistry , gravimetric analysis , materials science , chemical engineering , organic chemistry , engineering
Rhenium oxide supported on magnesium oxide has been investigated in order to clarify the existence and the nature of an interaction between the support and the dispersed species. Samples containing up to 5.7% by weight of rhenium, have been obtained by impregnation of magnesium oxide with an ammonium perrhenate solution. The study, performed by using X‐ray photoelectron spectroscopy, X‐ray diffraction and thermo‐gravimetric techniques demonstrates that a surface interaction is indeed present. The effect on the XPS peak intensities of several parmeters such as surface area, degree of hydration, and chemical composition is examined. Variations of surface area and transformation from magnesium hydroxyde into oxide after heat treatments modify the XPS Re/Mg intensity ratios, and comparison between calculated and observed values lead to the deduction that the rhenium species are not mobile on the surface.