Mechanistic Features of Reduction of Copper Chromite and State of Absorbed Hydrogen in the Structure
of Reduced Copper Chromite
Review
| Общее |
Language:
Английский,
Genre:
Review,
Status:
Published,
Source type:
Translated
|
| Journal |
Russian Journal of General Chemistry
ISSN: 1070-3632
, E-ISSN: 1608-3350
|
| Output data |
Year: 2008,
Volume: 78,
Number: 11,
Pages: 2203-2213
Pages count
: 11
DOI:
10.1134/S1070363208110418
|
| Authors |
Khasin A.A.
1
,
Yur'eva T.M.
1
,
Plyasova L.M.
1
,
Kustova G.N.
1
,
Jobic H.
2
,
Ivanov A.
3
,
Chesalov Yu.A.
1
,
Zaikovskii V.I.
1
,
Khasin A.V.
1
,
Davydova L.P.
1
,
Parmon V.N.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrent’eva 5, Novosibirsk, 630090 Russia
|
| 2 |
Institute for Research in Catalysis and Environment, Lyon, France
|
| 3 |
Laue–Langevin Institute (ILL), Grenoble, France
|
|
The review discusses the experimental data on the unusual mechanism of the reduction of copper cations from the copper chromite, CuCr2O4, structure. Treatment of copper chromite in hydrogen at 180–370oC
is not accompanied by water formation but leads to absorption of hydrogen by the oxide structure with
simultaneous formation of metallic copper as small flat particles which are epitaxially bound to the oxide. This
process is due to the redox reaction Cu2+ + H2 → Cu0 + 2H+; the protons are stabilized in the oxide phase,
which is confirmed by neutron diffraction studies. The reduced copper chromite which contains absorbed
hydrogen in its oxidized state and the metallic copper particles epitaxially bound to the oxide phase structure
exhibit catalytic activity in hydrogenation reactions.