Papers by Keyword: Supported Pt Catalyst

Abstract: By pretreatment of Pt/CeO₂ catalysts with high temperature reduction and subsequent low temperature reoxidation, the concentration of Ce³⁺ species in the Pt/CeO₂ catalysts could be adjusted, while at the same time the Pt particle size remained constant. Thus the pure effect of Ce³⁺/Ce⁴⁺ couples on the selective hydrogenation of crotonaldehdye could be explored. The investigation provided direct proofs supporting that Ce³⁺ species favors the crotyl alcohol selectivity.

Abstract: The methanol oxidation was studied at two differently prepared supported Pt electrodes (Pt-C/GC and Pt/GC) in 0.5 M H2SO4 and 0.1 M NaOH. The supported Pt electrodes were characterized by AFM, STM TEM and HRTEM. The higher activity of Pt-C/GC than of Pt/GC catalyst, as well as negligible differences in the activities between the supported Pt catalysts and the corresponding single crystal electrodes oriented as the sites in the catalyst deposits in which Pt particles are dominant, clearly suggest the influence of the particle size effect on the catalyst activity.