The epoxidation reaction of propylene (C₃H₆) for propylene oxide (PO) production was, for the first time of its kind, investigated in a low-temperature parallel-plate dielectric barrier discharge system with two frosted glass plates and a separate C₃H₆ feed under ambient condition. For the mixed feed experiments, the maximum PO selectivity was found at a feed molar air-to-C₃H₆ ratio of 0.5:1, an applied voltage of 7 kV, an input of 550 Hz, and a feed flow rate of the mixed gas of 100 cm³/min (corresponding to a residence time (RT) of 12.1 s). At the optimum operational conditions, a separate C₃H₆ feed position fraction of 1 (complete separation of C₃H₆) with total reactant feed flow rate of 100 cm³/min (corresponding to an O₂ residence time (RT) of 24.1 s), the greatest propylene oxide selectivity of 16.40% was achevied. The relatively high PO selectivity with very low selectivities for all other products and with the absence of both CO and CO₂ obseved in this studied resulted from less active of C₃H₆ due to the separate feed of C₃H₆. The C₃Hseparate feed is fundamentally responsible for the reduction in all the undesired reactions including cracking, dehydrogenation, coupling, and oxidations of C₃H₆.

Graphical Abstract

中文翻译：

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具有两个磨砂玻璃板的低温平行板介质阻挡放电反应器中的丙烯环氧化：单独丙烯进料的影响

丙烯的环氧化反应(C₃H₆) 首次在低温平行板介质阻挡放电系统中研究了用于环氧丙烷 (PO) 生产的方法，该系统具有两块磨砂玻璃板和一个单独的 C ₃H₆ 在环境条件下进料。对于混合进料实验，在进料摩尔空气对 C₃H _{时发现最大 PO 选择性6}比例0.5:1，施加电压7kV，输入550Hz，混合气体进料流量100cm ³/分钟（相当于 12.1 秒的停留时间 (RT)）。在最佳操作条件下，单独的 C₃H₆ 进料位置1 的分数（C₃H₆ 的完全分离）与总反应物进料流量为 100 cm³/min（相当于 O₂ 停留时间 (RT) 为 24.1 s)，实现了 16.40% 的最大环氧丙烷选择性。本研究中观察到的 PO 选择性相对较高，而对所有其他产物的选择性非常低，且不存在 CO 和 CO₂，这是由于 PO 的活性较低C₃H₆ 由于 CH 单独进料从根本上负责减少所有不需要的反应，包括 C₃。 C₆H₃H₆。

图形概要