Nickel oxide powder synthesis from aqueous solution of nickel nitrate hexahydrate by a microwave denitration method

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書誌事項

公開日
2015-05
資源種別
journal article
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/j.apt.2015.04.004
公開者
Elsevier BV

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説明

Abstract Denitration of the aqueous solution of nickel nitrate hexahydrate (Ni(NO 3 ) 2 ⋅6H 2 O) by a microwave heating method was investigated. Since Ni(NO 3 ) 2 ⋅6H 2 O aqueous solution cannot be heated to over 300 °C by microwave irradiation owing to the low microwave absorptivity of its intermediate, the final product of the denitration reaction (NiO) could not previously be obtained by microwave heating. We propose a novel NiO synthesis method that uses microwave heating without the risk of chemical contamination. In this technique, a NiO powder reagent (the same as the final product) was added to the solution of the raw material to function as a microwave acceptor. Moreover, the denitration efficiency to NiO could be improved by setting an adiabator around the reactor to increase the temperature homogeneity in the reactor, as well as raise the temperature at the periphery. Numerical simulations also reveal that the use of the adiabator results in remarkable changes in the electromagnetic field distribution in the reactor; consequently, temperature inhomogeneity decreases. Furthermore, the temperature dependence of the denitration efficiency to NiO, which is calculated from the simulated temperature distribution, approximately agrees with the experimental data. Accordingly, this indicates that the simulated results can estimate the progress of the denitration reaction to NiO using this microwave heating method.

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