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In situ/operando spectroscopic studies on NH3-SCR reactions catalyzed by a phosphorus-modified Cu-CHA zeolite
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| Title: | In situ/operando spectroscopic studies on NH3-SCR reactions catalyzed by a phosphorus-modified Cu-CHA zeolite |
| Authors: | Kubota, Hiroe Browse this author | | Liu, Chong Browse this author | | Amada, Takehiro Browse this author | | Kon, Kenichi Browse this author | | Toyao, Takashi Browse this author →KAKEN DB | | Maeno, Zen Browse this author →KAKEN DB | | Ueda, Kakuya Browse this author | | Satsuma, Atsushi Browse this author →KAKEN DB | | Tsunoji, Nao Browse this author →KAKEN DB | | Sano, Tsuneji Browse this author →KAKEN DB | | Shimizu, Kenichi Browse this author →KAKEN DB |
| Keywords: | Cu-exchanged CHA zeolite | | NH3-SCR | | in situ/operando spectroscopy | | Phosphorus modification |
| Issue Date: | 15-Sep-2021 |
| Publisher: | Elsevier |
| Journal Title: | Catalysis today |
| Volume: | 376 |
| Start Page: | 73 |
| End Page: | 80 |
| Publisher DOI: | 10.1016/j.cattod.2020.07.084 |
| Abstract: | The modification of Cu-exchanged zeolites with phosphorus represents a promising method to enhance their hydrothermal stability, which is of pivotal importance for catalysts that promote the selective catalytic reduction of NO with ammonia (NH3-SCR). In this study, we investigated the reaction mechanism of NH3-SCR catalyzed by a phosphorus-modified CHA zeolite that contains active Cu species (Cu-P-CHA), and assessed the effect of the phosphorus modification on the hydrothermal stability of the catalyst by employing in situ/operando spectroscopic methods. In their entirety, the combined results from in situ/operando IR, UV-vis, and XANES experiments revealed that the NH3-SCR process over Cu-P-CHA proceeds via the reduction of Cu(II) to Cu(I) followed by a reoxidation of Cu(I) to Cu(II). In addition, we found that the phosphorus modification improved the hydro thermal durability of the catalyst by retaining a higher amount of the redox-active Cu species and the zeolite framework. |
| Rights: | © 2021. 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/2115/90385 |
| 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: 鳥屋尾 隆
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