Design of a capacity-enhanced single-mode reactor for microwave chemistry researches
Design of a capacity-enhanced single-mode reactor for microwave chemistry researches
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DOI：
10.1016/j.cej.2021.131898
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发表时间：
2022
影响因子：
15.1
通讯作者：
Wencong Zhang;Li Wu;Yanping Zhou;Yongchi Xu;J. Deng;Ziyi Yang;Haoran Sun
中科院分区：
文献类型：
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作者：
Wencong Zhang;Li Wu;Yanping Zhou;Yongchi Xu;J. Deng;Ziyi Yang;Haoran Sun
随着微波化学研究在更高ISM频率下的发展，迫切需要能够保证高再现性、均匀的微波加热面积和更大的处理量的反应器。本文提出了一种用于5.8 GHz微波化学研究的新型容量增强型单模反应器及其设计方法。所提出的反应器是基于一个尺寸放大的矩形波导，它可以包含更大体积的反应物。然而，该反应器中微波的高阶传播电磁模式受到限制，只留下一阶te10模式。通过对高阶模态的约束，可以保证加热均匀性。与多模腔微波反应器相比，单模微波加热可以更好地保证微波辅助反应的再现性，特别是与旋转元件相比。通过一组全波数值模拟对反应器进行了优化，并说明了设计原则。最后，以一个反应器为例，对设计方法和数值计算进行了验证。通过实验验证了加热均匀性和对高阶电磁模的有效抑制。该容量增强型单模电抗器及其设计方法可推广到其他ISM频率。之所以选择5.8 GHz，是因为它的波长要短得多，而且更需要增加处理量。
With the development of microwave chemistry researches at higher ISM frequencies, reactors that can guarantee a high reproducibility of microwave-assisted reaction, a uniform microwave heating area and a more extensive processing volume become an urgent need. This paper proposes a new type of capacity-enhanced single-mode reactor and its design method for microwave chemistry research at the frequency of 5.8 GHz. The proposed reactor is constructed based on a size-enlarged rectangular waveguide, which can contain a larger volume of reactants. However, the higher-order propagating electromagnetic modes of the microwave in the proposed reactor were restrained and only left the first-order TE10mode. The heating uniformity thereby can be ensured by the restraint of higher-order modes. The single-mode microwave heating in our proposed reactors can also better guarantee the reproducibility of microwave-assisted reactions, compared with the multi-mode cavity microwave reactors, especially those with rotation elements. A set of full-wave numerical simulations are conducted to optimize the reactor and illustrate the design principles. Finally, a reactor is chosen and fabricated as an example to validate the design method and the numerical calculations. Experiments are implemented to prove the heating uniformity and the effective restraint of higher-order electromagnetic modes. The capacity-enhanced single-mode reactor and its design method can be extended to other ISM frequencies. 5.8 GHz is chosen because it has a much shorter wavelength and is more needed to increase the processing volume.