化学
铂金
催化作用
氢
吸附
无机化学
氧气
氯化氢
氯化物
有机化学
标识
DOI:10.1016/0021-9517(83)90142-2
摘要
Ptγ-Al2O3 catalysts with and without chloride were treated at different temperatures in oxygen or hydrogen and were studied by temperature-programmed reduction and by hydrogen adsorption. Two surface oxides, α- and β-[PtO2]s, and two chloride-containing surface complexes, [PtIV(OH)xCly]s and [PtIVOxCly]s, could be found and a comprehensive scheme of surface reactions is proposed. Redispersion of Pt in oxygen is possible only in the presence of chloride and is connected with the formation of [PtIVOxCly]s. A model for the redispersion is proposed.
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