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このアイテムの引用には次の識別子を使用してください:
http://hdl.handle.net/10119/11598
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| タイトル: | In situ observation of the dynamic behavior of Cu–Al–O_x catalysts for water gas shift reaction during daily start-up and shut-down (DSS)-like operation |
| 著者: | Nishimura, Shun
Shishido, Tetsuya
Ohyama, Junya
Teramura, Kentaro
Takagaki, Atsushi
Tanaka, Tsunehiro
Ebitani, Kohki |
| キーワード: | in-situ XAFS
water gas shift reaction
Cu-Al-Ox catalyst
redox |
| 発行日: | 2012-04-20 |
| 出版者: | Royal Society of Chemistry |
| 誌名: | Catalysis Science & Technology |
| 巻: | 2 |
| 号: | 8 |
| 開始ページ: | 1685 |
| 終了ページ: | 1693 |
| DOI: | 10.1039/C2CY20133J |
| 抄録: | To compare the catalytic performances against daily start-up and shut-down (DSS) operations between co-precipitated (CP) and impregnated (IMP) Cu-Al-O_x catalysts for the water gas shift (WGS) reaction, in-situ X-ray adsorption fine structure (XAFS) measurements, temperature-programmed reduction (TPR) profiles, X-ray diffraction (XRD) patterns and high resolution transition electron microscopy with an energy dispersive X-ray spectroscopy (TEM-EDS) analysis were performed. In-situ XAFS studies clearly indicated that the Cu species were frequently oxidized and reduced during DSS operations with steam treatment (DSS-like operation). Basedon in-situ XAFS and H_2-TPR profiles, the highly active and stable CP-catalyst possessed more susceptible Cu particles to oxidation/reduction (described as redoxable below) than IMP-catalyst even after the DSS-like operations. Interestingly, the XRD and TEM-EDS analysis observed the small Cu particles which were covered with a card-house structure of the in-situ formed boehmite in the case of the CP-catalyst after the DSS-like operations. According to these results, we concluded that the superior durability of CP-catalyst against frequent redox changes was attributed to the nanoscale coordination with the in-situ formed boehmite structure which preserves the small-redoxable Cu particles. |
| Rights: | Copyright (C) 2012 Royal Society of Chemistry. Shun Nishimura, Tetsuya Shishido, Junya Ohyama, Kentaro Teramura, Atsushi Takagaki, Tsunehiro Tanaka, and Kohki Ebitani, Catalysis Science & Technology, 2(8), 2012, 1685-1693. http://dx.doi.org/10.1039/C2CY20133J - Reproduced by permission of The Royal Society of Chemistry |
| URI: | http://hdl.handle.net/10119/11598 |
| 資料タイプ: | author |
| 出現コレクション: | c10-1. 雑誌掲載論文 (Journal Articles)
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