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

황-요오드 열화학 수소 생산 공정에서 니켈-백금 이원금속 촉매를 이용한 요오드화수소 분해 특성

  • Kim, Soo-Young (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Go, Yoon-Ki (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Park, Chu-Sik (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Bae, Ki-Kwang (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Young-Ho (Department of Applied Chemistry and Biological Engineering, Chungnam National University)
  • Received : 2012.01.30
  • Accepted : 2012.02.24
  • Published : 2012.02.28

Abstract

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 prepared by impregnation method. HI decomposition was carried out using a fixed bed reactor. As a result, Ni-Pt bimetallic catalyst showed enhanced catalytic activity compared with each monometallic catalyst. Deactivation of Ni-Pt catalyst was not observed while deactivation of Ni monometallic catalyst was rapidly occurred in HI decomposition. The HI 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 $NiI_2$ remained on 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 decomposition of HI. Consequently, it was considered that the activity of Ni-Pt bimetallic catalyst was kept during the HI decomposition reaction.

Keywords

S-I process;HI decomposition;Ni-Pt bimetallic catalyst;$NiI_2$

Acknowledgement

Grant : 원자력수소 핵심기술개발사업

Supported by : 과학기술부

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