TY - JOUR
T1 - Carbon reduction kinetics of NiO by microwave heating of the separated electric and magnetic fields
AU - Yoshikawa, Noboru
AU - Ishizuka, Etsuko
AU - Mashiko, Kenichi
AU - Taniguchi, Shoji
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid of the Ministry of Education, Sports, Culture, Science and Technology, Japan, Priority Area on Science and Technology of Microwave-Induced, Thermally NonEquilibrium Reaction Field. The authors acknowledge helpful discussions with Professor M. Sato, National Institute for Fusion Science (NIFS), and this study was conducted in a collaboration program with NIFS.
PY - 2007/12
Y1 - 2007/12
N2 - A powder mixture consisting of NiO and graphite was heated by microwave (MW) irradiation, and the reduction reaction kinetics was studied. The heating was performed in a single-mode MW applicator operated at 2.45 GHz. The specimen was placed in the waveguide at the maximum positions of either the electric (E-) field or the magnetic (H-) field. The reaction kinetics was investigated mostly at the E-field with variation of the reaction time, temperature, and grain sizes of NiO and graphite. It was shown that the kinetics was enhanced at the higher temperature and using smaller sized powder particles. The difference of the kinetics in the E-field and the H-field was investigated. A tendency was observed that the reduction rate was larger in the H-field than in the E-field at 600°C. Considering the fact that NiO was heated well in the E-field, while graphite was heated in both fields, graphite particles in the powder mixture might be selectively heated in the H-field. The obtained results were discussed considering the thermodynamics and the gas-solid reaction mechanisms.
AB - A powder mixture consisting of NiO and graphite was heated by microwave (MW) irradiation, and the reduction reaction kinetics was studied. The heating was performed in a single-mode MW applicator operated at 2.45 GHz. The specimen was placed in the waveguide at the maximum positions of either the electric (E-) field or the magnetic (H-) field. The reaction kinetics was investigated mostly at the E-field with variation of the reaction time, temperature, and grain sizes of NiO and graphite. It was shown that the kinetics was enhanced at the higher temperature and using smaller sized powder particles. The difference of the kinetics in the E-field and the H-field was investigated. A tendency was observed that the reduction rate was larger in the H-field than in the E-field at 600°C. Considering the fact that NiO was heated well in the E-field, while graphite was heated in both fields, graphite particles in the powder mixture might be selectively heated in the H-field. The obtained results were discussed considering the thermodynamics and the gas-solid reaction mechanisms.
UR - http://www.scopus.com/inward/record.url?scp=37249051300&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37249051300&partnerID=8YFLogxK
U2 - 10.1007/s11663-007-9093-7
DO - 10.1007/s11663-007-9093-7
M3 - Article
AN - SCOPUS:37249051300
SN - 1073-5615
VL - 38
SP - 863
EP - 868
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 6
ER -