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Methanation of CO2 on Ni(II)-Bearing Ferrite (NixFe3-xO4-δ; x=0.39, δ>0) in Flow System

Published online by Cambridge University Press:  15 February 2011

H. Kato ,
M. Tabata ,
M. Tsuji  and
Y. Tamaura
H. Kato
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, JAPAN
M. Tabata
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, JAPAN
M. Tsuji
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, JAPAN
Y. Tamaura
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, JAPAN
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Abstract

The methanation of CO2 has been studied by using reduced Ni(II)-bearing ferrite (NixFe3-xO4-δ; x=0.39, δ=0.1∼0.2) in an H2/CO2 mixed gas flow system. A yield of 31% and a high selectivity of 89% were obtained in the methanation for 6h using the H2-reduced Ni(II)-bearing ferrite. The X-ray diffractometry showed that the reduced Ni(II)-bearing ferrite during the methanation retained the spinel-type structure whose lattice constant increased from 0.8375 to 0.8379 nm. The chemical analysis corroborated an increase in the mole ratio of Fe2+/Fetotal in the Ni(II)-bearing ferrite. These results suggest that oxygen-deficient sites were formed in the spinel structure of the reduced Ni(II)-bearing ferrite. It has been found from the analysis using the Langmuir isotherm for dissociative adsorption that CO2 is adsorbed onto oxygen-deficient sites to be decomposed to an elemental carbon and two oxygen-deficient ions. The methanation of CO2 is considered to proceed owing to the oxygen deficient sites. It is considered that the methanation consists of three elementary reaction steps: 1) Formation of oxygen-deficient sites by H2-reduction, 2) Reduction of CO2 to carbon and Incorporation of two oxygen ions of the CO2 into the oxygen-deficient sites, and 3) Hydrogenation of the deposited carbon to CH4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 163
Copyright
Copyright © Materials Research Society 1994

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