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- W2111644765 abstract "Conversion of light alkanes to the corresponding high-valueadded olefins is one of the most challenging tasks in catalysis. Among them, the oxidative dehydrogenation (ODH) of propane to propene is an attractive alternative to the conventional catalytic dehydrogenation process. Vanadium and molybdenum are the main elements present in ODH catalysts. The yield of alkenes on most of the catalysts is still, however, not satisfactory because of the side reactions leading to the formation of COx. [7, 8] Carbon nanotubes (CNTs), a new type of carbon materials, have drawn much attention owing to their unique structure and excellent conductivity, diathermancy, and adsorption. CNTs had been used as catalysts or catalyst supports in heterogeneous catalysis. Many reports proved that CNTs show excellent catalytic properties in various reactions, such as ODH reactions. Su et al. used CNT catalysts in the ODH of alkanes. The catalyst shows higher catalytic activity and selectivity than does activated carbon. Wang et al. reported that vanadium oxide supported on CNTs shows a high initial activity at 673 K but deactivates quickly owing to the formation of bulky vanadium oxides. More reports described that a small amount of heteroatoms (B or P) can greatly improve the selectivity by suppressing the combustion of hydrocarbons. The above results show that the modified CNTs are promising catalysts to achieve good selectivity in ODH reactions. This encourages us to try new elements for the modification of the CNTs. The MoOx–POx/oxidized CNT (oCNT) catalysts were initially tested for the ODH of propane. The reason we chose molybdenum is that molybdenum is one of the most frequently used components of ODH reactions. Compared with vanadium oxide, molybdenum oxide is a relatively mild catalyst, which would not destroy the original structure of CNTs at high temperature. oCNTs are cheap and commercial multiwall CNTs, treated by the mixed-acid oxidation process, and were used as a catalyst support. Molybdenum oxide and phosphorus oxide were loaded on oCNTs by using the impregnation method. The structures of the MoOx–POx/oCNT catalysts were investigated by XRD, IR spectroscopy, and TEM. The effects of MoOx and POx addition on the structure and catalytic performance of the catalysts were investigated in detail." @default.
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- W2111644765 date "2012-01-13" @default.
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- W2111644765 title "Oxidative Dehydrogenation of Propane over MoOxand POxSupported on Carbon Nanotube Catalysts" @default.
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- W2111644765 doi "https://doi.org/10.1002/cctc.201100242" @default.
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