Decomposition of hydrogen iodide over Pt–Ir/C bimetallic catalyst

✍ Scribed by Zhichao Wang; Laijun Wang; Songzhe Chen; Ping Zhang; Jingming Xu; Jing Chen

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 455 KB
• Volume: 35
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2010.05.125

✦ Synopsis

Decomposition of hydrogen iodide (HI) is one of the key reactions in the sulfureiodine (SeI) thermochemical water splitting promising for the massive hydrogen production. Much effort has been made to explore the preparation of high performance catalyst for this hydrogen-producing reaction. Although platinum has long been found to be an efficient metallic catalyst, it was prone to agglomerate at elevated temperature resulting in a decrease in the hydrogen yield. A series of bimetallic PteIr/C catalysts were prepared by electroless plating to investigate the effect of Ir/Pt molar ratio on the HI conversion compared with Pt/C and Ir/C catalysts. The physical properties and morphology of the catalysts were characterized by BET, XRD, TEM and ICP-AES. The synergistic effect of platinum and iridium with respect to HI decomposition was confirmed by the fact that the bimetallic PteIr/C-0.77 catalyst with 1 wt% Pt loading and 0.77 wt% Ir loading showed much higher catalytic activity and thermostability compared with Pt/C and Ir/C catalyst. Based on the experimental results obtained, it may be concluded that the bimetallic PteIr/C catalyst was supposed to be a cost-effective and high performance catalyst promising to be employed for the hydrogen production via the SeI thermochemical water splitting cycle.