Abstract
Spillover of hydrogen over zirconium oxide promoted by sulfate ion and a platinum catalyst (Pt/SO 4 2− ZrO 2) was studied by temperature-programmed desorption (TPD), in which hydrogen was adsorbed at different temperatures and a sequential adsorption of hydrogen and deuterium was undertaken. As the hydrogen adsorption temperature was raised, the hydrogen uptake increased and the desorption peak shifted to higher temperatures. A sequential adsorption of hydrogen and deuterium resulted in an incomplete isotope mixing in the desorbed gases. Without platinum in the catalyst, hydrogen was scarcely adsorbed. The results are discussed in terms of hydrogen spillover. It is suggested that dissociative adsorption of the hydrogen molecule takes place on the platinum site followed by hydrogen spillover onto the support of zirconium oxide modified with sulfate ion (SO 4 2− ZrO 2).
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