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Report No.
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Development of synthesis process of nikel oxide powder by microwave

Segawa, Tomomi ; Suzuki, Masahiro ; Fujii, Kanichi; Igawa, Yusuke*; Arimitsu, Naoki*; Yamamoto, Tetsuya*; Fukui, Kunihiro*; Yoshida, Hideto*

The synthesis process of the denitration reaction by the microwave heating method was investigated using a nickel nitrate (Ni(NO$$_{3}$$)$$_{2}$$) aqueous solution. NiO powder cannot be obtained from Ni(NO$$_{3}$$)$$_{2}$$ aqueous solution by the microwave heating method because of low microwave absorption of the intermediate obtained from nitrate aqueous solution. In the present work, it was showed that Ni(NO$$_{3}$$)$$_{2}$$ aqueous solution with 6.0 g of NiO powder as a microwave absorber can be completely converted to NiO powder by microwave heating. NiO powder promotes the denitration reaction, and reduces the required reaction time with increasing the amount of NiO powder. Furthermore the adiabator was set around the reactor in order to equalize the temperature distribution in the reactor. It was also found that the denitration efficiency of Ni(NO$$_{3}$$)$$_{2}$$ aqueous solution to NiO powder can be improved by using the adiabator when the center of the reactor has the same temperature.

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