Tuesday, April 1, 2008 - 5:50 PM

Catalytic Decomposition of HI on Pt/C-Based Catalysts for Thermochemical Hydrogen Production Processes

Chu-Sik Park1, Jung-Min Kim1, Jung-Eun Park1, Young-Ho Kim2, Kyung-Soo Kang1, Chang-Hee Kim1, and Ki-Kwang Bae1. (1) Korea Institute of Energy Research, (2) Chungnam National University

As one method to produce hydrogen from water without use of fossil fuels, the thermochemical water splitting cycle was conceptually proposed by Funk and Reinstrom. The process is using a closed cycle that is consisted of combination of chemical reactions more than two to decompose water. Much thermochemical cycles about several hundreds are proposed at present, and some iodine-containing cycles among them include HI decomposition for hydrogen production. Recently, much attention on HI decomposition has been focused with the possibility of industrialization of Sulfur-Iodine (SI) cycle. However, it is disadvantage that the equilibrium conversion and reaction rate of homogeneous gas phase reaction for HI decomposition are very low. In this study, we investigated the effects of temperature, Pt loading and the produced I2 in HI decomposition on Pt/C-based catalysts. As the results, the conversion was increased with the increase of temperature in the range of 523~823 K, and with the higher Pt loading of 5wt.%. On the other hand, it was observed the conversion was decreased rapidly in the reaction at 523 K for all catalysts. It is because the product I2 was adsorbed on catalyst surfaces in the progress of reaction, and its amounts were relatively high at the lowest temperature of 523 K.

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