A series of Pt/γ Al 2O 3 catalysts with different content of Pt were characterized by using low temperature FT IR spectroscopy of adsorbed CO, while their catalytic activity for HDS was investigated with thiophene as a model substrate. On the basis of the experimental results, it has been obtained that the pseudo zero order rate of the thiophene HDS reaction is well linearly proportional to the total area of the two IR bands at 2?080 and 1?850 cm -1 of CO adsorbed on Pt/γ Al 2O 3, and that the Pt sites for CO adsorption may be the active centers for thiophene HDS reaction.
The mechanism of electrocatalytic hydrogenation of benzene was investigated by electrochemical techniques——Rotating Electrode(RE),Cyclic Voltammetry(CV).Based on the experimental results and reasonable analysis,the following conclusions were drawn:benzene hydrogenation is a multi-step,irreversible and elelctrocatalytic process controlled mainly by diffusion on Pt and Hg electrodes.For electrochemical coupling of benzene hydrogenation and water electrolysis,the composite SPE electrode with optimum catalyst was applied.It was found that the process of benzene hydrogenation on SPE electrode was controlled by diffusion that was consistent with the behaviors of benzene on Pt and Hg electrodes,nevertheless the electrochemical hydrogenation voltage on electrode was different.
