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Nanoparticles of Amorphous Ruthenium Sulfide Easily Obtainable from a TiO 2 ‐Supported Hexanuclear Cluster Complex [Ru 6 C(CO) 16 ] 2− : A Highly Active Catalyst for the Reduction of SO 2 with H 2
Author(s) -
Ishiguro Atsushi,
Nakajima Takayuki,
Iwata Tadahisa,
Fujita Masahiro,
Minato Taketoshi,
Kiyotaki Fumitaka,
Izumi Yasuo,
Aika Kenichi,
Uchida Masaya,
Kimoto Koji,
Matsui Yoshio,
Wakatsuki Yasuo
Publication year - 2002
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 - 10.1002/1521-3765(20020715)8:14<3260::aid-chem3260>3.0.co;2-c
Subject(s) - ruthenium , sulfide , crystallite , amorphous solid , catalysis , cluster (spacecraft) , nanoparticle , chemistry , inorganic chemistry , sulfur , metal , bimetallic strip , zinc sulfide , chemical engineering , materials science , crystallography , nanotechnology , organic chemistry , zinc , computer science , engineering , programming language
Abstract TiO 2 ‐supported ruthenium‐metal particles were derived from an anionic hexanuclear carbido carbonyl cluster [Ru 6 C(CO) 16 ] 2− and compared with those prepared conventionally by impregnation of TiO 2 with a solution of RuCl 3 followed by reduction with H 2 . The average sizes of the metal particles in both systems are similar, that is, 12 Å for molecular cluster‐derived particles and 15 Å for those derived from the RuCl 3 precursor, although the size distribution is sharper in the former case. These supported particles efficiently promote the reduction of SO 2 with H 2 to give elemental sulfur. Their active form is ruthenium sulfide as confirmed by EXAFS and X‐ray diffraction measurements. The nanoscale ruthenium sulfide particles, which originated from the cluster complex, have an amorphous character and show activity even at low temperature (463 K), whereas ruthenium sulfide formed from RuCl 3 ‐derived metal dispersion is a pyrite‐type RuS 2 crystallite and needs a temperature above 513 K to effect the same catalysis. Amorphous ruthenium sulfide maintains its nano‐sized scale (≈14 Å) regardless of the reaction temperature, while RuS 2 crystallite aggregates to form larger nonuniform particles.