Kinetic study of metal-catalyzed reaction of solid calcium oxide with gas mixtures of methane and water vapor to form hydrogen

With noble metal catalysts (Pd, Pt, Rh, Ir) present, hydrogen is formed by the interaction of solid calcium oxide with gas mixtures of methane and water vapor, according to CaO + CH4 + 2H2O → CaCO3 + 4H2. Among the metals, Ir and Rh are so active that the reaction takes place at temperatures as low...

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Bibliographic Details
Published in:Catalysis letters 2001-01, Vol.77 (1-3), p.63-66
Main Authors: CHIKAZAWA, Norihiro, FUJISAKI, Yasuhiro, SATO, Yoshinori, SUCHIRO, Masanori, YOSHIDA, Noritetsu
Format: Article
Language:English
Subjects:
Calcium carbonate
Calcium oxide
Catalysis
Catalytic reactions
Chemical reactions
Chemistry
Exact sciences and technology
Gas mixtures
General and physical chemistry
Iridium
Lime
Methane
Noble metals
Palladium
Platinum
Rhodium
Strong interactions (field theory)
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Vapor pressure
Water vapor
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Summary:With noble metal catalysts (Pd, Pt, Rh, Ir) present, hydrogen is formed by the interaction of solid calcium oxide with gas mixtures of methane and water vapor, according to CaO + CH4 + 2H2O → CaCO3 + 4H2. Among the metals, Ir and Rh are so active that the reaction takes place at temperatures as low as 600 K. Rate data obtained with these metals show a nearly first order with respect to CH4 pressure, while a negative order with respect to H2O vapor pressure. The apparent activation energies are 171 and 217 kJ/mol for the Ir- and Rh-catalyzed reactions, respectively. On the other hand, Ni does not catalyze the reaction below 733 K, probably due to its strong interaction with H2O vapor.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1012763817882