Affiliation:
1. Institute of Inorganic Chemistry Leipzig University Johannisallee 29 04103 Leipzig Germany
2. MOLYMET Germany GmbH Niels-Bohr-Str. 5 06749 Bitterfeld-Wolfen Germany
Abstract
AbstractThe reduction of metal oxides with hydrogen is widely used for the production of fine chemicals and metals both on the laboratory and industry scale. In situ methods can help to elucidate reaction pathways and to gain control over such synthesis reactions. In this study, the reduction of WO3 and V2O5 with hydrogen was investigated by in situ X‐ray powder diffraction with regard to intermediates and the influence of heating rates and hydrogen flow rates. Mixtures of V4O9, V6O13 and VO2 in two modifications were identified as intermediates on the way to phase‐pure V2O3. None of the intermediates occurs in a single phase and therefore cannot be prepared this way. In contrast, the intermediates of the WO3 reduction, H0.23WO3 and W10O29, appear consecutively and can be isolated. For both reactions, the heating and flow rates have little influence on the formation of intermediates.
Funder
Deutsche Forschungsgemeinschaft
Subject
General Chemistry,Catalysis,Organic Chemistry
Cited by
2 articles.
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