Photoelectron spectroscopy (XPS) and thermogravimetry (TG) of pure and supported rhenium oxides 1. Pure rhenium compounds

Zeitschrift fur Anorganische und Allgemeine Chemie - Tập 460 Số 1 - Trang 86-98 - 1980
A. Cimino1, B.A. De Angelis2, Delia Gazzoli1, M. Valigi1
1Instituto di Chimica Generale ed Inorganica dell'Università di Roma, Roma (Italy)
2Laboratori Ricerche di Base, ASSORENI Monterotondo, Roma (Italy)

Tóm tắt

AbstractTo investigate the interaction of rhenium with several supports, a preliminary study on pure rhenium compounds has been carried out in order to achieve a better understanding of their surface chemical properties.To this end X‐ray photoelectron spectroscopy (XPS) and thermogravimetry (TG) methods have been applied.The results show that metallic rhenium, ReO2 and ReO3 are covered with Re(VII). By heating in H2, NH4ReO4 and rhenium oxides are reduced to metallic rhenium in different temperature ranges. In the case of Re2O7 a spillover effect has been found when platinum is present. For ReO3 and ReO2 a morphological model has been described on the basis of combined XPS, TG and surface area measurements.The binding energy values of the different rhenium oxidation states have been assessed and their variation with the oxidation number briefly discussed.

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Zeitschrift fur Anorganische und Allgemeine Chemie

Tập 460 Số 1

86-98

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