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Octyl and propylsulfonic acid co-fixed Fe3O4@SiO2 as a magnetically separable, highly active and reusable solid acid catalyst in water
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| Title: | Octyl and propylsulfonic acid co-fixed Fe3O4@SiO2 as a magnetically separable, highly active and reusable solid acid catalyst in water |
| Authors: | Nuryono, Nuryono Browse this author | | Qomariyah, Ani Browse this author | | Kim, Wontae Browse this author | | Otomo, Ryoichi Browse this author →KAKEN DB | | Rusdiarso, Bambang Browse this author | | Kamiya, Yuichi Browse this author →KAKEN DB |
| Keywords: | Magnetite | | Silica coating | | Solid acid | | Hydrophobicity | | Ethyl acetate hydrolysis |
| Issue Date: | Oct-2019 |
| Publisher: | Elsevier |
| Journal Title: | Molecular Catalysis |
| Volume: | 475 |
| Start Page: | 110248 |
| Publisher DOI: | 10.1016/j.mcat.2018.11.019 |
| Abstract: | Modifications of propylsulfonic acid-fixed Fe3O4@SiO2 with three organosilanes (C-2, C-8, and phenyl) were investigated to develop a magnetically separable solid acid catalyst active for hydrolysis of ethyl acetate in excess water. Among the organosilanes, triethoxy(octyl)silane was the best modifier for improvement in catalytic activity, with activity of approximately twice that of the unmodified catalyst. The catalytic activity was comparable to those of Cs2.5H0.5PW12O40 and H3PW12O40 anchored on hydrophobic SBA-15 if compared per acid sites, though the acid strength of sulfonic acid was much weaker than that of H3PW12O40. High hydrophobicity over the surface and around the acid sites created by the octyl group was responsible for the high catalytic activity and the high stability in water. In addition to the improvement in catalytic activity, modification with the octyl group provided high stability for repeated uses of the catalyst in the reaction and there was little decrease in activity over at least four reuses. The catalyst was easily separated from the reaction solution by application of an external magnetic field. |
| Rights: | © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ | | https://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/82862 |
| Appears in Collections: | 環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 神谷 裕一
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