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'Electron Transfer' in keywords Facet   section ZfN Section A:Volume 050  [X]
Facet   Publication Year 1995  [X]
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1Author    Naoki Toshima, Yumi Yamaji, Toshiharu Teranishi, Tetsu YonezawaRequires cookie*
 Abstract    h o to s e n s itiz e d R e d u c tio n o f C a r b o n D io x id e in S o lu tio n U s in g N o b le -M e ta l C lu s te rs f o r E le c tr o n T r a n s f e r Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday Carbon dioxide was reduced to methane by visible-light irradiation of a solution composed of tris(bipyridine)ruthenium(III) as photosensitizer, ethylenediaminetetraacetic acid disodium salt as sacrificial reagent, methyl viologen as electron relay, and a colloidal dispersion of polymer-protected noble-metal clusters, prepared by alcohol-reduction, as catalyst. Among the noble-metal clusters examined, Pt clusters showed the highest activity for the formation of methane as well as hydrogen. In order to improve the activity, oxidized clusters and bimetallic clusters were also applied. For example, the CH4 yield in 3-h irradiation increased from 51 x 10"3 |xmol with unoxidized Pt clusters to 72 x 10" 3 pmol with partially oxidized ones. In the case of Pt/Ru bimetalic systems, the improve­ ment of the catalytic activity by air treatment was much greater than in case of monometallic clusters. 
  Reference    Z. Naturforsch. 50a, 283—291 (1995); received October 4 1994 
  Published    1995 
  Keywords    Carbon dioxide, Photosensitized reduction, Electron transfer, Metal cluster, Colloidal catalyst 
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 Identifier    ZNA-1995-50a-0283 
 Volume    50