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>> This study was performed to develop a low Pt content catalyst as a catalyst for HI decomposition in S-I process. Bimetallic catalysts added various amounts of Pt on a silica supported Ni catalyst were preparedby impregnation method. HI decomposition was carried out using a fixed bed reactor. As a result, Ni-Pt bimetalliccatalyst showed enhanced catalytic activity compared with each monometallic catalyst. Deactivation of Ni-Pt catalystwas not observed while deactivation of Ni monometallic catalyst was rapidly occurred in HI decomposition. TheHI conversion of Ni-Pt bimetallic catalyst was increased similar to Pt catalyst with increase of the reaction temperature over a temperature range 573K to 773K. From the TG analysis, it was shown that NiI 2 remainedon the Ni(5.0)-Pt(0.5)/SiO 2 catalyst after the HI decomposition reaction was decomposed below 700K. It seems that small amount of Pt in bimetallic catalyst increase the decomposition of NiI 2 generated after the decompositionof HI. Consequently, it was considered that the activity of Ni-Pt bimetallic catalyst was kept during the HI decomposition reaction.

Charateristics of Hydrogen Iodide Decomposition using Ni-Pt Bimetallic Catalyst in Sulfur-Iodine Process