| 초록 |
Our group has been developed Pt-based catalysts with high sulfur resistance for water-gas shift reaction to produce hydrogen from waste-derived syngas. In our previous research, ceria was found to be the optimal support for Pt-based catalysts by support screening studies. In this study, we changed the loading amount of Pt from 0.1 to 10.0 wt% to enhance the sulfur resistance of the Pt/CeO2 catalyst. As a result, the 2.0 wt% Pt/CeO2 catalyst showed the strongest sulfur tolerance and the highest regeneration rate among the prepared samples, even under harsh reaction conditions with exposure to 500 ppm hydrogen sulfide, a high CO concentration in the feed gas (ca. 38%), and high GHSV of 46,000 h-1. Also, we found that the loading amount of Pt in the Pt/CeO2 catalyst not only affects the dispersion of Pt but also affects the redox property of the catalyst, which is originated from the oxygen reverse spillover. These results were derived from the results of H2-TPR, XPS, and H2-O2 pulse reaction. Consequently, 2.0 wt% Pt/CeO2 catalyst showed high sulfur tolerant catalytic activity in the water-gas shift reaction due to the high oxygen storage capacity. |
