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Catalytic activities of titania-supported nickel for carbon-dioxide methanation
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| Title: | Catalytic activities of titania-supported nickel for carbon-dioxide methanation |
| Authors: | Unwiset, Preeya Browse this author | | Chanapattharapol, Kingkaew Chayakul Browse this author | | Kidkhunthod, Pinit Browse this author | | Poo-arporn, Yingyot Browse this author | | Ohtani, Bunsho Browse this author →KAKEN DB |
| Keywords: | Carbon-dioxide methanation | | Titania-supported nickel | | XANES | | EXAFS |
| Issue Date: | 31-Dec-2020 |
| Publisher: | Elsevier |
| Journal Title: | Chemical Engineering Science |
| Volume: | 228 |
| Start Page: | 115955 |
| Publisher DOI: | 10.1016/j.ces.2020.115955 |
| Abstract: | Titania-supported nickel catalysts (3, 6, 12 and 20 wt% Ni/TiO2) were prepared by a sol-gel method. The results showed that the CO2 conversion increased with increasing Ni content and 20 wt% Ni/TiO2 exhibited the highest CO2 conversion and CH4 yield. The results on XRD and EXAFS revealed unit cell expansion and lattice distortion, which indicated that Ni2+ was incorporated into the TiO2 lattice. Upon increasing the Ni content, the NiO phase was observed. The oxidation states of nickel and titanium were analyzed to be +2 and +4, respectively for fresh catalysts. After pretreatment by H-2, Ni2+ was converted to Ni-0 and this electronic state remained unchanged during the course of methanation while Ti4+ was kept unaltered for fresh catalysts and those during the reaction. The addition of Ni led to the formation of oxygen vacancy and NiO phase which might act as adsorption sites for CO2 and H-2, respectively. (C) 2020 Elsevier Ltd. All rights reserved. |
| Rights: | © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/87838 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 大谷 文章
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