An Adsorption and Calorimetric Study of the Interaction
of Hydrogen with Chromium Oxide

V. E. Ostrovskii^a, E. A. Kadyshevich^b, B. V. Gostev^a, and A. L. Lapidus^c

^a Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064 Russia

^b Oboukhov Institute of Atmospheric Physics, Russian Academy of Sciences, Pyzhevskii per. 3, Moscow, 119017 Russia

^c Zelinskii Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii pr. 47, Moscow, 119991 Russia

e-mail: vostrov@cc.nifhi.ac.ru; kadyshevich@mail.ru; albert@ioc.ac.ru

Received January 31, 2008

Abstract—The chemisorption of hydrogen on porous chromium oxide was studied at temperatures up to 723K
under the conditions of controlled oxygen, hydrogen, and water contents in the samples. The molar heats of
chemisorption were measured at temperatures up to 473 K. Hydrogen was found to be chemisorbed
(310kJ/mol) in the form of water and absorbed into oxide volume (165 kJ/mol) in the form of coordination
bound atoms. Changes in the molar heat of the processes during chemisorption were caused by changes in the
ratio between chemisorption and sorption. The phenomena observed and quantitative results could be explained
by simple Langmuir concepts without assumptions of surface heterogeneity.

DOI: 10.1134/S0036024408100026

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