Studies of oxidative dehydrogenation of ethanol over manganese oxide octahedral molecular sieve catalysts

Abstract A series of manganese oxide octahedral molecular sieve (OMS) materials were prepared and characterized by X-ray diffraction and surface area measurements (Brunauer-Emmett-Teller). Some first row transition metals (Ni 2+ , Cu 2+ , Fe 3+ , Co 2+ , Mg 2+ ) were doped into the framework of these octahedral molecular sieve materials to give [M]-OMS materials. The catalytic activities of these materials were studied in the oxidative dehydrogenation of ethanol in a flow reactor at different temperatures and at various ratios of ethanol to O 2 . The influence of space velocity on the reaction was also tested. The experimental results showed that both the conversions and selectivities of this reaction over each individual OMS material are highly dependent on the nature of OMS materials and the transition metal dopants in their framework structures. The [Co]-OMS-1 materials show the highest conversion and selectivity to acetaldehyde of all materials. Basic sites on both OMS-1 and OMS-2 materials may be responsible for catalytically active sites in this reaction.