Determining the influence of microwave-induced thermal unevenness on vanadium oxide catalyst particles
Determining the influence of microwave-induced thermal unevenness on vanadium oxide catalyst particles
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确定微波引起的热不均匀性对氧化钒催化剂颗粒的影响
DOI：
10.1016/j.cej.2021.133603
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发表时间：
2022
影响因子：
15.1
通讯作者：
Wada Yuji
中科院分区：
文献类型：
--
作者：
Tsubaki Shuntaro;Matsuzawa Tomoki;Higuchi Tomoki;Fujii Satoshi;Wada Yuji
微波（MW）加热可在低温下加速各种非均相催化反应，从而实现节能的催化过程。本文采用显微热成像技术和电磁/热流模拟技术研究了V_2O_5催化剂颗粒间热分布的不均匀性。局部热产生从球形催化剂颗粒的接触点开始。在异丙醇脱水过程中，温度梯度的不均匀性随催化剂氧化态的动态变化而变化，原位拉曼光谱表明，温度梯度的动态变化与V2 O 5催化剂的氧化态有关。因此，在V2 O 5催化剂颗粒的接触点处的局部热点的形成，以及由于MW的V2 O 5的氧化态，协同影响2-丙醇的脱水的增强。目前的研究结果提供了重要的见解到一个机械的理解的反应增强的固定床流动反应，由于微波诱导的不均匀的热分布。
Microwave (MW) heating accelerates various heterogeneous catalytic reactions at low temperatures, leading to energy-efficient catalytic processes. Herein we report the formation of MW–formed uneven thermal distribution at the interparticle of V2O5catalyst by using microscopic thermography and electromagnetic/thermal flow simulations. The local heat generation started from the contact point of the spherical catalyst particles. The uneven thermal distribution changed as the oxidation state of the catalyst dynamically changed during the dehydration of 2-propanol.In situRaman spectroscopy suggested that dynamic change in the thermal gradient attributes to the oxidation state of the V2O5catalyst. As a result, the formation of the local hot spot at the contact point of the V2O5catalyst particles, as well as the oxidation state of V2O5due to MWs, synergistically affect the enhancement in the dehydration of 2-propanol. The present results provide important insights into a mechanistic understanding of the reaction enhancement of the fixed-bed flow reaction owing to the MW-induced uneven thermal distribution.