Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process
The Sulfur-Iodine process is in need of catalytic reactor for HI decomposition because the HI decomposition reaction rate is very slow. Nickel as an alternative catalyst for platinum was investigated in this study. Al2O3 supported Ni catalysts were prepared by impregnation method. Ni amounts loaded...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2016-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/matecconf/20166706063 |
| _version_ | 1818412128989609984 |
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| author | Park Chu-Sik Kim Ji-Hye Cho Won-Chul Jeong Seong-Uk Kang Kyoung-Soo Kim Chang-Hee Kim Young Ho Bae Ki-Kwang |
| author_facet | Park Chu-Sik Kim Ji-Hye Cho Won-Chul Jeong Seong-Uk Kang Kyoung-Soo Kim Chang-Hee Kim Young Ho Bae Ki-Kwang |
| author_sort | Park Chu-Sik |
| collection | DOAJ |
| description | The Sulfur-Iodine process is in need of catalytic reactor for HI decomposition because the HI decomposition reaction rate is very slow. Nickel as an alternative catalyst for platinum was investigated in this study. Al2O3 supported Ni catalysts were prepared by impregnation method. Ni amounts loaded over Al2O3 were in the range of 0.1~20 wt. %. HI decompositions were carried out in the temperature range of 573 ~ 773 K using the fixed-bed quartz reactor. The difference of catalysts before and after the reaction was analyzed using BET, CO/H2 chemisorption, XRD, XRF and SEM. It was confirmed by XRD and SEM-EDX analysis that Ni was converted to NiI2 during the HI decomposition. Catalyst deactivation due to the formation of NiI2 leads to a reduction of HI conversion. Although Ni of catalyst converted to NiI2, HI decomposition with low loading (up to 3 wt. %) catalyst showed a little decrease of HI conversion. However, with more than 5 wt. % catalyst, the initial HI conversion was considerably decreased. In the particular case of 20 wt. %, the initial conversion was increased close to 60 %, which is higher than 20 % as an equilibrium conversion at 723 K. These results showed that Ni had not only a catalytic function for HI decomposition, but also function as a sorbent to absorb I2 produced from HI. |
| first_indexed | 2024-12-14T10:42:24Z |
| format | Article |
| id | doaj.art-3373789d0e414138922c3e09fc4b8a08 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-14T10:42:24Z |
| publishDate | 2016-01-01 |
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| series | MATEC Web of Conferences |
| spelling | doaj.art-3373789d0e414138922c3e09fc4b8a082022-12-21T23:05:38ZengEDP SciencesMATEC Web of Conferences2261-236X2016-01-01670606310.1051/matecconf/20166706063matecconf_smae2016_06063Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine ProcessPark Chu-Sik0Kim Ji-Hye1Cho Won-Chul2Jeong Seong-Uk3Kang Kyoung-Soo4Kim Chang-Hee5Kim Young Ho6Bae Ki-Kwang7Hydrogen Research Center, Korea Institute of Energy Research (KIER)Hydrogen Research Center, Korea Institute of Energy Research (KIER)Hydrogen Research Center, Korea Institute of Energy Research (KIER)Hydrogen Research Center, Korea Institute of Energy Research (KIER)Hydrogen Research Center, Korea Institute of Energy Research (KIER)Hydrogen Research Center, Korea Institute of Energy Research (KIER)Department of Chemical Engineering and Applied Chemistry, Chungnam National UniversityHydrogen Research Center, Korea Institute of Energy Research (KIER)The Sulfur-Iodine process is in need of catalytic reactor for HI decomposition because the HI decomposition reaction rate is very slow. Nickel as an alternative catalyst for platinum was investigated in this study. Al2O3 supported Ni catalysts were prepared by impregnation method. Ni amounts loaded over Al2O3 were in the range of 0.1~20 wt. %. HI decompositions were carried out in the temperature range of 573 ~ 773 K using the fixed-bed quartz reactor. The difference of catalysts before and after the reaction was analyzed using BET, CO/H2 chemisorption, XRD, XRF and SEM. It was confirmed by XRD and SEM-EDX analysis that Ni was converted to NiI2 during the HI decomposition. Catalyst deactivation due to the formation of NiI2 leads to a reduction of HI conversion. Although Ni of catalyst converted to NiI2, HI decomposition with low loading (up to 3 wt. %) catalyst showed a little decrease of HI conversion. However, with more than 5 wt. % catalyst, the initial HI conversion was considerably decreased. In the particular case of 20 wt. %, the initial conversion was increased close to 60 %, which is higher than 20 % as an equilibrium conversion at 723 K. These results showed that Ni had not only a catalytic function for HI decomposition, but also function as a sorbent to absorb I2 produced from HI.http://dx.doi.org/10.1051/matecconf/20166706063 |
| spellingShingle | Park Chu-Sik Kim Ji-Hye Cho Won-Chul Jeong Seong-Uk Kang Kyoung-Soo Kim Chang-Hee Kim Young Ho Bae Ki-Kwang Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process MATEC Web of Conferences |
| title | Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process |
| title_full | Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process |
| title_fullStr | Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process |
| title_full_unstemmed | Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process |
| title_short | Bifunctional Characteristics of Al2O3 supported Ni in the HI Decomposition of Sulfur-Iodine Process |
| title_sort | bifunctional characteristics of al2o3 supported ni in the hi decomposition of sulfur iodine process |
| url | http://dx.doi.org/10.1051/matecconf/20166706063 |
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