Sulfur-Tolerant Pt/CeO2Catalyst with Enhanced Oxygen Storage Capacity by Controlling the Pt Content for the Waste-to-Hydrogen Processes

Abstract

In the Pt/CeO2 catalyst, we found that the loading amount of Pt affects not only the dispersion of Pt but also the interaction between Pt and CeO2, specifically to the oxygen storage capacity. The interface between Pt and CeO2 has some special properties due to oxygen reverse spillover, which affects the oxygen storage capacity of the catalyst. The loading amount of Pt in the Pt/CeO2 catalyst was varied from 0.1 to 10.0 wt %, and the physicochemical properties were compared. The prepared samples were tested to the water-gas shift reaction in the waste-to-hydrogen process with the existence of 500 ppm of H2S to evaluate the sulfur tolerant catalytic performance. Among the samples, the 2.0% Pt/CeO2 catalyst showed the highest sulfur tolerance. Considering the catalytic reaction result and physicochemical properties, the sulfur tolerant catalytic activity can be mainly related to the oxygen storage capacity. From this result, we have concluded that the loading amount of Pt not only affects the dispersion of Pt0 but also affects the oxygen storage capacity of the catalyst.