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Report No.

Synthesis of nickel oxide particles by denitration reaction using hybrid heating method

Tamaru, Ayaka*; Nagakawa, Genta*; Segawa, Tomoomi ; Fukasawa, Tomonori*; Ishigami, Toru*; Fukui, Kunihiro*

This study aims to investigate the effect of hybrid heating on the denitration reaction of a nickel nitrate aqueous solution to evaluate the feasibility of hybrid heating method with an alumina jacket containing carbon nanotube (CNT) as a microwave heating medium. When an alumina jacket without CNT was used, the temperature decreased and the denitration reaction stopped due to the formation of an intermediate product Ni$$_{2}$$(NO$$_{3}$$)$$_{2}$$$$^{.}$$(OH)$$_{4}$$ with low dielectric loss. Whereas, when an alumina jacket containing 0.2 mass% CNT was used, the denitration reaction was completed and nickel oxide particles were obtained. It is presumed that the denitration reaction proceeds by heat conduction from the CNT-containing alumina jacket because the jacket is selectively heated by microwaves more than the Ni$$_{2}$$(NO$$_{3}$$)$$_{2}$$$$^{.}$$(OH)$$_{4}$$. It is clarified that hybrid heating can be realized by a CNT-containing alumina jacket.



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