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Nitrogen-doped metal-free carbon catalysts for aerobic oxidation of xanthene

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Title: Nitrogen-doped metal-free carbon catalysts for aerobic oxidation of xanthene
Authors: Fujita, Shin-Ichiro Browse this author →KAKEN DB
Yamada, Katsuaki Browse this author
Katagiri, Ayaka Browse this author
Watanabe, Hiroyuki Browse this author
Yoshida, Hiroshi Browse this author →KAKEN DB
Arai, Masahiko Browse this author →KAKEN DB
Keywords: Carbon
Nitrogen doping
Issue Date: Nov-2014
Publisher: Elsevier
Journal Title: Applied catalysis A: general
Volume: 488
Start Page: 171
End Page: 175
Publisher DOI: 10.1016/j.apcata.2014.09.049
Abstract: N-doped carbons were prepared from a commercial activated carbon (AC) by heat treatments in pure NH3, an NH3-air mixture, and NO and these were used for a model reaction of aerobic oxidation of xanthene to xanthone (XO). The catalytic activity of AC for the title reaction was greatly enhanced by N-doping and the enhancement in the activity depended on the N source gasses used. The effectiveness of the three gases for both N-doping and enhancing the activity was in an order of NH3-air > NH3 > NO. The temperature of N-doping also affected the catalyst activity but not so significantly. X-ray photoelectron spectroscopy (XPS) indicated the presence of pyridine-type and pyrrole-fpyridone-type N species. The catalytic activity of N-doped carbon was correlated with the ratio of the amount of pyridine-type N against that of ether-type O species. The structures of the active sites were discussed on the basis of the XPS and reaction results. Metal-free N-doped AC was less active than a commercial Rut AC catalyst but more active than a commercial Pd/AC one. The activity of N-carbon slightly decreased after the first recycling but it remained almost the same during the following two-time recycling.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤田 進一郎

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