Issue 29, 2009
From the journal:

Physical Chemistry Chemical Physics

The state of absorbed hydrogen in the structure of reduced copper chromite from the vibration spectra

Alexander A. Khassin,*ac   Galina N. Kustova,a   Hervé Jobic,b   Tamara M. Yurieva,a   Yury A. Chesalov,ac   Georgii A. Filonenko,c   Lyudmila M. Plyasovaa  and  Valentin N. Parmonac  

* Corresponding authors

a Boreskov Institute of Catalysis, Pr. Lavrentieva, 5, Novosibirsk, Russia
E-mail: aakhassin@catalysis.ru
Fax: +7 (8∼)383 330 8056
Tel: +7 (8∼)383 330 9109

b Institut de recherches sur la catalyse et l’environnement de Lyon (IRCELYON), 2 av. Albert Einstein, F 69626 Villeurbanne, France
E-mail: herve.jobic@ircelyon.univ-lyon1.fr
Tel: +33 (0)4 72 445301

c Novosibirsk State University, Pirogova str., 2, Novosibirsk, Russia
E-mail: phychem@fen.nsu.ru
Tel: +7 (8∼)383 363 4261

Abstract

The reduction of copper chromite, CuCr2O4, is followed by means of thermogravimetric analysis. The reduced state is studied by means of FT IR spectroscopy, Raman spectroscopy and inelastic neutron scattering. The reduction of copper occurs in two stages: absorption of hydrogen at 250–400 °C and dehydration of the reduced state at above 450 °C. The measured vibrational spectra prove that a considerable amount of hydrogen is absorbed by the oxide structure with absorbed protons stabilized in OH and HOH-groups (geminal protons). Three groups of vibration bands are observed in the INS spectra, which can be assigned to stretching, bending and libration vibrations. An increase in the reduction temperature of copper chromite results in softening of the stretching and hardening of the bending vibrations, what can be related to the strengthening of hydrogen bonding.

Graphical abstract: The state of absorbed hydrogen in the structure of reduced copper chromite from the vibration spectra

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Article information

DOI
https://doi.org/10.1039/B821381J
Article type
Paper
Submitted
28 Nov 2008
Accepted
08 Apr 2009
First published
13 May 2009

Phys. Chem. Chem. Phys., 2009,11, 6090-6097

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The state of absorbed hydrogen in the structure of reduced copper chromite from the vibration spectra

A. A. Khassin, G. N. Kustova, H. Jobic, T. M. Yurieva, Y. A. Chesalov, G. A. Filonenko, L. M. Plyasova and V. N. Parmon, Phys. Chem. Chem. Phys., 2009, 11, 6090 DOI: 10.1039/B821381J

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