Platinum-ceria-zirconia catalysts for hydrogen production in sulfur-iodine cycle

摘要

In this study, Pt/Ce_(1-x)Zr_x catalysts with different Zr mole concentration (x = 0, 0.2, 0.5, 0.8, 1) have been tested to evaluate their effects on hydrogen iodide (HI) decomposition for hydrogen production in the sulfur-iodine (SI or IS) cycle at various temperatures. The Pt/Ce_(1-x)Zr_x catalysts strongly enhanced the HI conversion to H_2 by comparison with blank test, especially the Pt/Ce_(0.8)Zr_(0.2) catalyst. BET, XRD, TEM, EDS, TPR were performed for catalysts characterization. It was found that, through introducing ZrO_2 into Pt/CeO_2, a synergistic effect between Pt and CeO_2-ZrO_2 solid solution was different from Pt and CeO_2 yield, such as improvement of the thermal stability and increase of Pt-O-Ce reducibility. Among the three samples containing Zr, the one with 20 mol% displayed the best activity for hydrogen production.