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Surface Characterization of Carbon-Bearing Magnetite (CBM) and Carbon-Bearing Ni(II)-Ferrite (CBNF)

Published online by Cambridge University Press:  15 February 2011

T. Sano ,
K. Akanuma ,
M. Tsuji  and
Y. Tamaura
T. Sano
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling and Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
K. Akanuma
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling and Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
M. Tsuji
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling and Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
Y. Tamaura
Affiliation:
Department of Chemistry, Research Center for Carbon Recycling and Utilization, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152, Japan
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Abstract

Oxygen-deficient magnetite (ODM; Fe3O4-δ, δ>0) synthesized by reduction of magnetite with H2 at 300°C decomposed CO2 to carbon with an efficiency of nearly 100% at 300°C. In this reaction, two oxygen ions of the CO2 were incorporated into the spinel structure of ODM and carbon was deposited on the surface of ODM with zero valence to form visible particles. The particles of carbon separated from ODM were studied by Raman, energy-dispersive X-ray and wave-dispersive X-ray spectroscopies. The carbon which had been deposited on the ODM was found to be a mixture of graphite and amorphous carbon in at least two levels of crystallization. X-ray photoelectron spectroscopy and X-ray diffraction patterns of the carbon-bearing magnetite (CBM) showed no indication of carbide (Fe3C) or metallic iron (α-Fe) phase formation. In the C 1s XPS spectra of the CBM, no peaks were observed which could be assigned to CO2 or CO. X-ray diffractometry, chemical analysis and TG-MS measurement showed that the carbon-bearing Ni(II)-ferrite (CBNF) (Ni(II)/Fetotal = 0.15) synthesized by the carbon deposition reaction from CO2 with the H2-reduced Ni(II)-ferrite was represented by (Ni0.28Fe2.72O4.00)1-δ (Ni2+06.9Fe2+2.31O3.00)δCτ (δ= 0.27, τ= 0.17). The carbon of the CBNF gave the CIOlayer-like oxide containing some Ni2+ ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 344: Symposium I – Materials and Processes for Environmental Protection , 1994 , 169
Copyright
Copyright © Materials Research Society 1994

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