New generation reaction of H{sub 2} from H{sub 2}O with carbon-bearing ferrites at 300 C
- Tokyo Inst. of Tech. (Japan)
The carbon-bearing magnetite (CBM) was prepared by the carbon-deposition on the H{sub 2}-treated magnetite with CO{sub 2} at 300 C. The CBM reacted with H{sub 2}O and evolved H{sub 2} gas at 300--350 C. The surface of the CBM was composed of a new iron(II)oxide/carbon layer (CIOlayer). X-ray diffractometry and chemical analysis showed that the CIOlayer was transformed to an amorphous carbide phase by allowing to stand in Ar stream at 300 C, which is so reactive as to decompose H{sub 2}O into H{sub 2}. The mole ratio of the evolved H{sub 2} gas to the evolved CO{sub 2} was nearly equal to that in the carbide (Fe{sub 3}C) decomposition reaction with H{sub 2}O. During the H{sub 2}O decomposition, oxygen ions are transferred to the surface layer forming iron oxide. When the carbon-bearing Ni(II)-ferrite (CBNF) was used as the solid phase, the hydrogen evolution reaction takes place without decreasing in the carbon content in the CBNF, and the evolved H{sub 2} volume was approximately 8 times higher than that evaluated from the oxidized amount of the iron ions in the CBNF. This result suggests that some amount of oxygen in the CBNF is released while allowing to stand the sample in Ar stream at 300 C. These H{sub 2} evolution reactions can proceed at low temperature of around 300 C. This provides the way to establish a unique chemical heat pump system, where the waste heat around 300 C is transferred to chemical energy of H{sub 2}. The surface layer composed of iron(II) oxide/carbon is the key compound for this reaction.
- OSTI ID:
- 106167
- Report Number(s):
- CONF-940411-; ISBN 1-55899-239-1; TRN: IM9542%%255
- 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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