Res. Chem. Intermed.
, Vol. 34, Nos 8–9, pp. 767–770 (2008)
Koninklijke Brill NV, Leiden, 2008.
Also available online - www.brill.nl/rci
Effect of benzothiophene on tetralin hydrogenation over
supported rhodium catalyst in supercritical carbon
NORIHITO HIYOSHI, CHANDRASHEKHAR V. RODE,
OSAMU SATO and MASAYUKI SHIRAI
Research Center for Compact Chemical Process, National Institute of Advanced Industrial Science
and Technology (AIST), 4-2-1, Nigatake, Miyagino, Sendai, 983-8551, Japan
Received 5 July 2007; accepted 29 August 2007
Abstract—The hydrogenation behavior of tetralin in the presence and absence of benzothiophene
was studied over a charcoal-supported rhodium catalyst in supercritical carbon dioxide solvent. The
catalyst activity, as well as cis-decalin selectivity, decreased in the presence of benzothiophene.
Keywords: Supercritical carbon dioxide; hydrogenation; tetralin; cis-decalin.
Cyclic saturated hydrocarbons, such as decahydronaphthalene (decalin), bicyclo-
hexyl and methylcyclohexane, are proposed as hydrogen storage media because
they are more stable, safer and cheaper than other storage means, such as metal
hydrides and hydrogen cylinders [1 –3]. Hydrogen can be obtained by catalytic de-
hydrogenation of the cyclic saturated hydrocarbons to the corresponding aromatic
compounds and can be stored by the hydrogenation of the aromatic products over
supported metal catalysts. For hydrogen production from decalin, its cis-isomer
is more preferable, because the dehydrogenation rate of cis-decalin is faster than
that of trans-decalin . Thus, the development of an efﬁcient catalytic system
for the stereoselective hydrogenation of naphthalene and tetralin to cis-decalin is
important. Aromatic compounds often contain thiophene-like compounds, which
poison the metal catalysts affecting their hydrogenation activity. We have already
reported that higher reaction rate and higher selectivity to cis-decalin were obtained
To whom correspondence should be addressed. Fax: (81-22) 237-5224;