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用环己烷脱氢、正己烷异构和氢解脉冲反应与硫中毒方法考察了不同温度焙烧和还原的Pt/Al_2O_3催化剂表面活性中心的性质。从硫中毒的结果进一步论证了在高分散Pt/Al_2O_3上烃类的氢解、异构和加、脱氢反应的活化程度的差别以及金属中心的活化能力对反应选择性的影响。试验结果表明,催化剂上烃类分子的反应途径和转化深度既和金属中心对C-H键的活化能力有关,同时也和烃类分子本身活化的难易或活化机理有关。
The properties of surface active sites of Pt / Al 2 O 3 catalysts calcined and reduced at different temperatures were investigated by cyclohexane dehydrogenation, n-hexane isomerization and hydrogenolysis pulse reaction and sulfur poisoning. The results of sulfur poisoning further demonstrate the difference in the degree of activation of hydrogenation, isomerization, addition and dehydrogenation of hydrocarbons on highly dispersed Pt / Al 2 O 3 and the influence of the activity of the metal center on the reaction selectivity. The experimental results show that the reaction pathway and the depth of conversion of hydrocarbon molecules on the catalyst are related both to the activation ability of the C-H bond at the metal center and to the difficulty or activation mechanism of activation of hydrocarbon molecules themselves.