Abstract
Oxidative dehydrogenation of methanol into formaldehyde was studied over various binary mixtures of metal oxides. Among them SnO2-MoO2- catalyst was the most active and selective. These oxide catalysts were classified into MoO2-containing one and the others on the basis of the conversion-selectivity relationship and CO/CO2 production ratio. The reaction on MoO3containing catalysts probably proceeded in consecutive reactions like CH3OH-ICHOCO.The activity and selectivity over SnO2-MoO2- was little changed in the range of Sn/Mo ratio from 1/9 to 7/3. The fact that HCHO was formed on MoO3 suggests that the activity of SnO2- MoO, is essentially attributed to MoO2-. ESR measurements of SnO2-MoO2- revealed that the concentration of Mo5+ ion is correlated with the catalyst activity.
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