Mechanism and Kinetic of Coke Oxidation by Nonthermal Plasma in Fixed-Bed Dielectric Barrier Reactor
Mechanism and Kinetic of Coke Oxidation by Nonthermal Plasma in Fixed-Bed Dielectric Barrier Reactor
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DOI：
10.1021/acs.jpcc.9b00743
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
A. Astafan;C. Batiot-Dupeyrat;L. Pinard
中科院分区：
文献类型：
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作者：
A. Astafan;C. Batiot-Dupeyrat;L. Pinard
丙烯在八面沸石上在 623 K 下转化而形成焦炭是根据产物形状选择性机制发生的，并导致形成高度烷基化的多芳香族分子，例如萘、芘和晕苯。它们的主要部分被困在内腔（超级笼）中，毒害布朗斯台德酸位点并堵塞微孔。在常见的热再生过程中，焦炭在 800 K 下燃烧，而本研究表明，通过在固定床介电势垒反应器中使用低能耗的非热等离子体，可以在 293 K 下实现沸石的完全再生（即天然酸度和微孔性的完全恢复）：固定床介电势垒反应器是适合工业规模化的几何结构。焦炭氧化的动力学速率以及酸度和微孔率的恢复是相似的。活性物质（例如 O*、O2+）能够在沸石微孔内扩散并氧化轻分子，速度比重分子快 36 倍。得益于完整的性格...
The formation of coke resulting from propene transformation at 623 K on a faujasite zeolite occurs according to a product shape selectivity mechanism and yields to the formation of highly alkylated polyaromatic molecules such as naphthalene, pyrene, and coronene. Their main parts are trapped in the inner cavities (supercages), poison Bronsted acid sites, and plug micropores. With a common thermal regeneration process, coke burns at 800 K, whereas this study shows that a complete regeneration of zeolite (i.e., total recovery of the native acidity and microporosity) can be achieved at 293 K by using a nonthermal plasma with a low energy consumption in a fixed-bed dielectric barrier reactor: a geometry suitable for industrial scaling. The kinetic rates of coke oxidation and the recovery of acidity and microporosity are similar. The active species (e.g., O*, O2+) are able to diffuse within the zeolite micropores and oxidize the light molecules, 36 times faster than the heavier ones. Thanks to a complete chara...