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本文应用动力学和气相色谱分析方法研究了 MgO,MgO-ZnO,Al_2O_3,SiO_2,ZrO_2,SiO_2—ZrO_2(5%—72%ZrO_2)等氧化物催化剂对异丙醇与丁酮的醛(酮)醇氢转移的催化话性.并用吡啶选择中毒方法探讨了醛(酮)醇氢转移活性中心和醇脱水活性中心的本质.实验结果表明 MgO Al_2O_3,SiO_2—ZrO_2(5%—50%ZrO_2)等催化剂皆具有很强的氢转移催化活性,少量吡啶对 SiO_2-ZrO_2的氢转移催化活性无明显影响.这种活性中心作用力可能和镁、铝、锆化合物对醛酮类的特殊络合能力有关.根据伸丁醇脱水成三种异构烯的产物分量分布,以及吡啶选择中毒实验结果看来,具有脱氢作用力的 MgO MgO-ZnO,和 ZrO_2催化剂的脱水活性中心与具有强的脱水性能的 Al_2O_3,SiO_2-ZrO_2,SiO_2等催化剂的脱水活性中心性质显然不同.
In this paper, kinetics and gas chromatographic analysis were used to study the effect of oxide catalysts such as MgO, MgO-ZnO, Al_2O_3, SiO_2, ZrO_2 and SiO_2-ZrO_2 (5% -72% ZrO_2) The catalytic properties of alcohol-hydrogen transfer were also investigated. The nature of the aldehyde (keto) alcohol-hydrogen transfer activity center and alcohol dehydration activity center were investigated by pyridine selective poisoning. The experimental results show that MgO Al 2 O 3, SiO 2 -ZrO 2 (5% -50% ZrO 2) The catalyst has a strong hydrogen transfer catalytic activity, a small amount of pyridine hydrogen transfer catalytic activity of SiO_2-ZrO_2 no significant effect of this active center may be magnesium, aluminum, zirconium compounds on the special complexation of aldehydes and ketones . According to the dehydration of butanol to three isomeric alkene product component distribution, and pyridine poisoning results, it seems dehydrogenation of MgO MgO-ZnO, and ZrO 2 catalyst dehydration activity center and has a strong dehydration performance The properties of dehydration centers such as Al 2 O 3, SiO 2 -ZrO 2 and SiO 2 are obviously different.