Characterization and performance for propane oxidative dehydrogenation of Li-modified MoO3/Al2O3 catalysts
Applied Catalysis A: General(2003)
摘要
Oxidative dehydrogenation of propane has been studied on Mo/γ-Al2O3 catalysts with 13wt.% of MoO3 and promoted with Li. The changes induced on catalysts when the support is doped with different amounts of Li (from 0.3 to 1.2wt.%) have been studied by BET, AAS, XRD, SEM-EDAX, TPR, DRS, XPS, Raman spectroscopy and isopropanol decomposition. The characterization of the samples showed important changes in: texture, Mo supported structure, acid–base properties and reducibility. The Li replaces Brønsted acid sites and decreases the strength of the terminal MoO bond. The change in the strength of the terminal MoO bond does not correlate with the decrease in Mo species reducibility or with the decrease in propane conversion. This behavior suggests that the terminal MoO bond is not the active sites for ODH of propane. The selectivity to propene increases at lower conversion whereas at higher values it leveled off around 25%.
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关键词
Propane oxidative dehydrogenation,Li-doped Mo/γ-Al2O3 catalysts,Raman
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