Surface characterization of carbon-bearing magnetite (CBM) and carbon-bearing Ni(II)-ferrite (CBNF)
- Tokyo Inst. of Tech. (Japan)
Oxygen-deficient magnetite (ODM; Fe{sub 3}O{sub 4{minus}{delta}}, {delta} > 0) synthesized by reduction of magnetite with H{sub 2} at 300 C decomposed CO{sub 2} to carbon with an efficiency of nearly 100% at 300 C. In this reaction, two oxygen ions of the CO{sub 2} 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 (Fe{sub 3}C) or metallic iron ({alpha}-Fe) phase formation. In the C 1s XPS spectra of the CBM, no peaks were observed which could be assigned to CO{sub 2} or CO. X-ray diffractometry, chemical analysis and TG-MS measurement showed that the carbon-bearing Ni(II)-ferrite (CBNF) (Ni(II)/Fe{sub total} = 0.15) synthesized by the carbon deposition reaction from CO{sub 2} with the H{sub 2}-reduced Ni(II)-ferrite was represented by (Ni{sub 0.28}Fe{sub 2.72}O{sub 4.00}){sub 1{minus}{delta}} (Ni{sub 0.69}{sup 2+}Fe{sub 2.31}{sup 2+}O{sub 3.00}){sub {delta}}C{sub {tau}} ({delta} = 0.27, {tau} = 0.17). The carbon of the CBNF gave the CIOlayer-like oxide containing some Ni{sup 2+} ions.
- OSTI ID:
- 106183
- Report Number(s):
- CONF-940411-; ISBN 1-55899-239-1; TRN: IM9542%%271
- Resource Relation:
- Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 4-8 Apr 1994; Other Information: PBD: 1994; Related Information: Is Part Of Materials and processes for environmental protection; Voss, K.E.; Quick, L.M. [eds.] [Englehard Corp., Iselin, NJ (United States)]; Gadgil, P.N. [ed.] [Queens Univ., Kingston, Ontario (Canada)]; Adkins, C.L.J. [ed.] [Sandia National Labs., Albuquerque, NM (United States)]; PB: 356 p.; Materials Research Society symposium proceedings, Volume 344
- Country of Publication:
- United States
- Language:
- English
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