Low Temperature Oxidation of Benzene Over Pd/Co3O4 Catalysts in the Electric Field
Low Temperature Oxidation of Benzene Over Pd/Co3O4 Catalysts in the Electric Field
复制标题
Pd/Co3O4 催化剂电场下苯的低温氧化
DOI：
10.1007/s10562-020-03230-y
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发表时间：
2020-06
影响因子：
2.8
通讯作者：
Lin He
中科院分区：
文献类型：
--
作者：
Shen Feixiang;Li Ke;Zhao Xuteng;Li Xiaobo;Chen Ting;Zhan Reggie;Zhao Tongbin;Lin He
摘要采用电场耦合催化体系，在Pd/Co 3 O 4催化剂上实现了苯的低温氧化。对于具有1%Pd负载的催化剂，苯完全转化的温度在电场下从358 °C显著降低至293 °C。结果表明，电场促进了Co 3 O 4尖晶石中晶格氧的释放，从而促进了Pd 0氧化生成PdOx。DRIFT结果表明，活性中心[PdOx]是在电场作用下通过MvK机理与催化剂本体中的O物种反应形成的，而在常规催化体系中，活性中心的形成需要高温下气态氧的解离.此外，由于电场促进了Co 3 O 4载体的“H 2 O沉”效应，消除了产水分子对催化剂活性的抑制作用。根据实验结果和讨论，揭示了电场作用下Pd/Co 3 O 4催化剂上苯氧化的反应途径。图形摘要
Abstract The catalytic system coupled with electric field was utilized to realize oxidation of benzene over Pd/Co 3 O 4 catalysts at low temperature. For catalysts with 1% Pd loading, the temperature for complete conversion of benzene was substantially reduced from the 358 °C to 293 °C with electric field. The characterization results demonstrated that release of lattice oxygen in the Co 3 O 4 spinel was enhanced with electric field, therefore reinforced the formation of PdO x from the oxidation of Pd 0 . DRIFT results showed that active sites [PdO x ] was formed from the reaction of PdO x with O species from catalyst bulk through MvK mechanism under electric field while dissociation of gaseous oxygen that occur at relatively high temperature is necessary for the formation of active sites in conventional catalytic system. In addition, the inhibition of the produced water molecules on the catalyst activity was eliminated due to the promoted “H 2 O sink” effect of Co 3 O 4 support with electric field. Based on the results and discussion, pathways of benzene oxidation over Pd/Co 3 O 4 catalyst under electric field are revealed. Graphic abstract
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