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Decomposition of CO2 to carbon by H2-reduced Ni(II)- and Co(II)-bearing ferrites at 300 °C

Published online by Cambridge University Press:  03 March 2011

T. Kodama ,
H. Kato ,
S.G. Chang ,
N. Hasegawa ,
M. Tsuji  and
Y. Tamaura
T. Kodama
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152, Japan
H. Kato
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152, Japan
S.G. Chang
Affiliation:
Lawrence Berkeley Laboratory, University of California, 1 Cyclotron Road, Berkeley, California 94720
N. Hasegawa
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152, Japan
M. Tsuji
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152, Japan
Y. Tamaura
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152, Japan
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Abstract

Ni(II)- and Co(II)-bearing ferrites with different levels of metal substitution have been studied for CO2 decomposition. Ni2+ and Co2+ have been substituted for Fe2+ or Fe3+ in magnetite with the spinel type of crystal structure up to 14% and 26% for the mole ratio of Ni2+ and Co2+ to the total Fe contents, respectively. The metal substitution was corroborated by Mössbauer spectroscopy and XRD studies. They were activated in a flow of H2 gas to form oxygen-deficient ferrites with the spinel structure retained. The oxygen-deficient M(II)-bearing ferrites have been found to show high reactivity toward CO2 decomposition to carbon at 300 °C. The reactivity increased with the level of metal substitution and activation. The oxygens of CO2 were incorporated into the spinel structure and carbon was deposited on the surface of the ferrites. The deposited carbon was visible on dissolution of the ferrites used. The rate of decomposition on H2-activated Ni(II)-bearing ferrite with the mole ratio of 14% was 30 times as high as that of H2-activated magnetite.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 462 - 467
Copyright
Copyright © Materials Research Society 1994

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