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Oxidative dehydrogenation of propane using lattice oxygen of vanadium oxides on silica

机译:使用二氧化硅上氧化物的晶格氧对丙烷的氧化脱氢作用

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Oxidative dehydrogenation of propane using lattice oxygen of vanadium oxide was carried out with a fix-bed flow reactor at 450 °C under atmospheric pressure. Vanadium oxide loaded on SiO2 from V(r-BuO)3O afforded a high propylene selectivity of 88.3% with a propane conversion of 26.5% based on the lattice oxygen of vanadium oxide. The catalyst prepared with V(t-BuO)3O exhibited higher propane conversion and propylene selectivity than that prepared with NH4VO3. Raman, XPS, and XRD analyses revealed that isolated VO_4~(3-) species seem to be active sites in the ODHP. For the dehydrogenation of propane, the lattice oxygen of the isolated VO_4~(3-) species was used to give propylene and H2O. The isolated VO_4~(3-) species was reduced to the isolated V~(3+) species and was regenerated by oxidation with oxygen. The activity was maintained for at least 10 repeated cycles, suggesting that VO_x/SiO2 would be a promising catalyst for ODHP.
机译:在大气压下,使用固定床的流动反应器在450°C下用固定床的流动反应器对丙烷进行氧化脱氢作用。 基于V(R-BuO)3O在SIO2上加载的氧化钒氧化物具有88.3%的高丙烯选择性,丙烷转化率为26.5%,基于氧化钒的晶格氧。 用V(T-BUO)3O制备的催化剂比用NH4VO3制备的丙烷转化率和丙烯选择性更高。 拉曼,XPS和XRD分析表明,孤立的vo_4〜(3-)物种似乎是ODHP中的活性位点。 对于丙烷的脱氢作用,使用分离的Vo_4〜(3-)物种的晶格氧给出丙烯和H2O。 分离的vo_4〜(3-)物种被还原为分离的V〜(3+)物种,并通过用氧气氧化再生。 至少10个重复的循环维持活性,这表明VO_X/SIO2将是ODHP的有希望的催化剂。

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