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

Fujita, Shin-Ichiro; Yamada, Katsuaki; Katagiri, Ayaka; Watanabe, Hiroyuki; Yoshida, Hiroshi; Arai, Masahiko

doi:10.1016/j.apcata.2014.09.049


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

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/57816

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
	Oxidation
	Xanthene
	Xanthone
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)
URI:	http://hdl.handle.net/2115/57816
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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