Interaction of Hydrogen with Copper-containing Oxide Catalysts: IV. Structure of Hydrogen-containing Copper Chromite Full article
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Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 1996, Volume: 37, Number: 4, Pages: 584-588 Pages count : 5 | ||
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Abstract:
The cation distribution and the forms and localization of dissolved hydrogen in the structure of copper chromite reduced in a hydrogen flow at 320 degrees C are studied by in situ powder X-ray and neutron diffraction. It is shown that copper ions are partially reduced to Cu-0 due to the exchange interaction with hydrogen and migrate to the surface of spinel crystals; another part of copper ions are reduced to Cu+ ions that diffuse into the octahedral positions. The Cr3+ ions do not interact with hydrogen, and their position does not change during reduction. The dissolved hydrogen occurs in two states: (I) atomic hydrogen incorporated in the octahedral interstices and (2) protons in the tetrahedra whose centers were occupied by the copper ions before reduction. The protons interact with the lattice oxygen forming the covalent O-H bonds. Due to these peculiarities of the structure, the reduced chromite can be transformed to the initial state of the stoichiometric spinel upon hydrogen removal.
Cite:
Plyasova L.M.
, Solovʹeva L.P.
, Kriger T.A.
, Makarova O.V.
, Yur'ieva T.M.
Interaction of Hydrogen with Copper-containing Oxide Catalysts: IV. Structure of Hydrogen-containing Copper Chromite
Kinetics and Catalysis. 1996. V.37. N4. P.584-588. WOS Scopus РИНЦ
Interaction of Hydrogen with Copper-containing Oxide Catalysts: IV. Structure of Hydrogen-containing Copper Chromite
Kinetics and Catalysis. 1996. V.37. N4. P.584-588. WOS Scopus РИНЦ
Original:
Плясова Л.М.
, Соловьева Л.П.
, Кригер Т.А.
, Макарова О.В.
, Юрьева Т.М.
Характер взаимодействия водорода с оксидными медьсодержащими катализаторами. IV. Структура водородсодержащего хромита меди
Кинетика и катализ. 1996. Т.37. №4. С.622-626. РИНЦ
Характер взаимодействия водорода с оксидными медьсодержащими катализаторами. IV. Структура водородсодержащего хромита меди
Кинетика и катализ. 1996. Т.37. №4. С.622-626. РИНЦ
Dates:
Submitted: | Apr 11, 1995 |
Identifiers:
Web of science | WOS:A1996VG28100024 |
Scopus | 2-s2.0-0000867757 |
Elibrary | 13238189 |
Chemical Abstracts | 1996:561449 |
Chemical Abstracts (print) | 125:205383 |