Abstract
Cyclic voltammetry on microsamples was applied to bismuth tungsten oxides and bismuth molybdenum oxides to check their stability to reduction and define their limit of use. In this study, different mechanisms of reduction of bismuth were observed. Aurivillius Bi 2WO 6 derivatives exhibit a two-step mechanism (Bi 0→Bi 2+ and Bi 2+→Bi 3+), similar to pure bismuth oxide. In contrast, the investigated bismuth molybdenum oxides (Bi 26Mo 10O 69-related phases and Bi 2Mo 3O 12) revealed a one-step mechanism (Bi 0→Bi 3+). A better stability was therefore revealed for bismuth–molybdenum oxides, which are well known for their catalytic properties. This makes these materials attractive for use as membrane for catalytic dense membrane reactor.
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