以点状Pt/η-Al_2O_3催化剂作为产生溢流氢的“源”,用原位红外光谱观察η-Al_2O_3上苯的加氢过程,发现溢流氢在η-Al_2O_3表面上可以迁移相当长的距离,它的迁移速度是苯加氢反应的控制步骤。结合TPSR-MS数据,认为苯的加氢是分步进行的,它先被加氢成环已二烯,再转化成环已烯,最终形成环已烷脱附。这些反应都是快速反应。 Pt / η-Al_2O_3 catalyst was used as the “source” of overflowing hydrogen. The in-situ IR spectra were used to observe the hydrogenation of benzene over η-Al_2O_3. It was found that overflow hydrogen could migrate for a relatively long time on the surface of η-Al_2O_3 Distance, its migration speed is the control step of the benzene hydrogenation reaction. Combined with TPSR-MS data, it is considered that the hydrogenation of benzene is carried out in a step-by-step manner. It is first hydrogenated to cyclohexadiene and then to cyclohexene, eventually forming cyclohexane to desorb. These reactions are fast reactions.