Abstract
The influence of platinum on ceria sulfation has been studied using thermogravimetry and infrared spectroscopy. The same types of sulfate species — surface and bulk-like species — are evidenced with or without Pt. Pt does not modify the thermal stability of both types of sulfate. It favors sulfate formation on low-surface-area CeO 2 samples. The reducibility of sulfate by H 2 is promoted by Pt irrespective of the types of sulfate formed on ceria. H 2S, which is formed by H 2 reduction of sulfate, partly remains on the catalyst. It is adsorbed not only on the oxide but also on Pt. Sulfur poisoning of Pt has been shown by IR study of CO adsorption.
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