Res. Chem. Intermed.
, Vol. 34, Nos 8–9, pp. 679–685 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Oxidation of aromatic hydrocarbons with H
by a nano-scale tubular aluminosilicate, Fe-containing
, YUTAKA TAKATA
, MASAYA SUZUKI
, TAKASHI MAEKAWA
and TSUTOMU YAMAGUCHI
Department of Materials Science and Biotechnology, Graduate School of Science and Engineering,
Ehime University, Bunkyo-cho 3, Matsuyama 790-8577, Japan
Research Center for Deep Geological Environments, National Institute of Advanced Industrial
Science and Technology (AIST), 1-1-1, Higashi, Tsukuba 305-8567, Japan
National Institute of Advanced Industrial Science and Technology (AIST), 2266-98, Shimo-sidami,
Moriyama-ku, Nagoya 463-8560, Japan
Received 5 October 2007; accepted 10 October 2007
Abstract—Imogolite is a nano-scale tubular clay mineral with the typical chemical composition
SiOH. The Fe-containing imogolite was synthesized from FeCl
aqueous solutions. The ﬁbrous morphology observed by AFM in this sample is similar to that of
synthetic imogolite. In the catalytic oxidation of aromatic hydrocarbon compounds such as benzene,
phenol and chrolobenzene, the aromatic ring was oxidized. When the side-chain is a hydrocarbon
group such as methyl, both benzene ring and the side-chain group were oxidized. It was found that
the side-chain group was preferentially oxidized.
Keywords: Imogolite; oxidation; morphology; FT-IR; XRD; AFM.
Imogolite drawn attention as a new nano-material because of its unique nano-
scale tubular structure, similar to that of a single-walled carbon nanotube [1 –3].
Imogolite is a naturally occurring aluminosilicate clay mineral with the typical
chemical composition (OH)
SiOH. The tubular structure of imogolite, as
proposed by Cradwick et al. , is shown in Fig. 1. The tubular wall is composed
of a single continuous Al(OH)
(gibbsite) sheet with orthosilicate anions (O
groups). Natural imogolite has an outer diameter of ca. 2 nm and an inner diameter
of ca. 1 nm.
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