• catalytic performance of sucrose-derived cmk-3 in oxidative dehydrogenation of propane to propene

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     cmk-3 carbon replica was synthesized by carbonization of sucrose introduced to the pore system of a sba-15 hard template followed by dissolving sio2 with hf. the material with a stable hexagonal structure and an expanded surface area (sbet = 1287 m2/g) was obtained. tg measurements showed that cmk-3 type mesoporous carbon started to be intensively oxidized by molecular o2 above 723 k. this carbon sample was tested as a catalyst of dehydrogenation of propane to propene under oxidative (o2:c3h8 = 0.25, 0.50 and 1.00) and non-oxidative (o2:c3h8 = 0.00) conditions in the temperature range from 573 to 873 k. the propene yield increased with rise in the reaction temperature, however above 573 k the formation of side-products (c2h6, c2h4, ch4 and h2) was observed. moreover, coke was deposited on the catalyst surface. a decrease in the mass of a catalyst bed after the catalytic runs suggested the participation of oxygen in burning of deposited and bulk coke. the surface composition of a spent catalyst was investigated by xps and tpd analysis. the changes in the concentration of oxygen functional groups, caused by the catalytic reaction, were observed regardless of a reaction temperature and feed composition.

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