Journal
MATERIALS LETTERS
Volume 91, Issue -, Pages 252-254Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2012.09.114
Keywords
Thermodynamics and kinetics of processes in materials; Non-thermal microwave effect; Reduction reaction; Copper oxide
Funding
- Ministry of Education, Culture, Science and Technology (MEXT), Japan [18070004]
- Grants-in-Aid for Scientific Research [18070004] Funding Source: KAKEN
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Reduction kinetics of CuO during microwave heating and conventional heating (electric furnace) were investigated to verify a process of direct transforming microwave energy into energy of reduction reaction. In the experiment, reduction speed during microwave heating or conventional heating was analyzed from an amount of emitted oxygen from a sample. An activation energy in each heating was obtained from an Arrhenius plot of the results. The activation energy in microwave heating at the maximum point of E-field (E-field heating) was decreased to 2/3 that in conventional one and the activation energy in microwave heating at the maximum point of H-field (H-field heating) was also decreased to 1/3 compared to that in conventional one. As the sample was reduced to Cu2O, microwave energy is transformed directly into reduction energy because the enthalpy of the reduction reaction is larger than activation energies in E-field and H-field heating. (C) 2012 Elsevier B.V. All rights reserved.
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