Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method
Mechanism of synthesis of metallic oxide powder from aqueous metallic nitrate solution by microwave denitration method
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DOI：
10.1016/j.cej.2012.09.032
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发表时间：
2012-11
影响因子：
15.1
通讯作者：
K. Fukui;Yusuke Igawa;Naoki Arimitsu;Masahiro Suzuki;T. Segawa;K. Fujii;Tetsuya Yamamoto;Hideto Yoshida
中科院分区：
文献类型：
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作者：
K. Fukui;Yusuke Igawa;Naoki Arimitsu;Masahiro Suzuki;T. Segawa;K. Fujii;Tetsuya Yamamoto;Hideto Yoshida
以六水合硝酸镍和三水硝酸铜为原料，研究了微波辐射法合成金属氧化物粉体的过程，并对反应器内的电场和温度分布进行了数值模拟。虽然CuO粉末可以通过微波辐射法从三水硝酸铜水溶液中获得，但六水合硝酸镍水溶液不能通过微波辐射加热至超过270°C。微波加热的反应路线与常规外部加热的反应路线相同。这一发现表明，通过微波蒸馏制备氧化物颗粒的成功不仅取决于中间体和金属氧化物的微波吸收率，而且还取决于完成向中间体的转化和开始向金属氧化物的显著转化之间的温差。此外，模拟结果表明，反应器内温度沿径向分布不均匀，中心温度最高，导致CuO粉末的分解反应从反应器中心同心进行。
The process for synthesizing metallic oxide powders by the microwave denitration method was investigated using hexahydrated nickel nitrate and trihydrated copper nitrate aqueous solutions, and the electrical field and the temperature distributions in the reactor were numerically simulated. Although CuO powder can be obtained from a trihydrated copper nitrate aqueous solution by the microwave denitration method, a hexahydrated nickel nitrate aqueous solution cannot be heated up to over 270°C by microwave irradiation. It was also found that the reaction routes for microwave heating are the same as those for conventional external heating. This finding indicates that the success of producing oxide particles by microwave denitration depends not only on the microwave absorptivity of the intermediate and the metallic oxide, but also on the temperature difference between the completion of the conversion to the intermediate and the beginning of the significant conversion to metallic oxide. Furthermore, the simulation results suggest that the reactor has a radially inhomogeneous temperature distribution with the highest temperature at the center, which causes the denitration reaction to produce CuO powder to progress concentrically from the center of the reactor.