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Highly Dispersed Ruthenium Hydroxide Supported on Titanium Oxide Effective for Liquid‐Phase Hydrogen‐Transfer Reactions
Author(s) -
Yamaguchi Kazuya,
Koike Takeshi,
Kim Jung Won,
Ogasawara Yoshiyuki,
Mizuno Noritaka
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200801655
Subject(s) - ruthenium , hydroxide , materials science , titanium , oxide , phase (matter) , ruthenium oxide , liquid phase , titanium oxide , chemical engineering , hydrogen , inorganic chemistry , chemistry , catalysis , metallurgy , organic chemistry , engineering , physics , thermodynamics
Supported ruthenium hydroxide catalysts (Ru(OH) x /support) were prepared with three different TiO 2 supports (anatase TiO 2 (TiO 2 (A), BET surface area: 316 m 2 g −1 ), anatase TiO 2 (TiO 2 (B), 73 m 2 g −1 ), and rutile TiO 2 (TiO 2 (C), 3.2 m 2 g −1 )), as well as an Al 2 O 3 support (160 m 2 g −1 ). Characterizations with X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), electron spin resonance (ESR), and X‐ray absorption fine structure (XAFS) showed the presence of monomeric ruthenium(III) hydroxide and polymeric ruthenium(III) hydroxide species. Judging from the coordination numbers of the nearest‐neighbor Ru atoms and the intensities of the ESR signals, the amount of monomeric hydroxide species increased in the order of Ru(OH) x