A series of Ba-doped CoOx/CeO2−y catalysts was prepared by co-precipitation followed by the deposition–precipitation method. The catalysts were investigated for selective oxidation (selox) of benzyl alcohol (B-ol) using tertiary butyl hydroperoxide (TBHP) without solvent and activity was compared with Co0.5/Ce0.5. The Ba loading has been optimized with time and temperature for selox reaction. The catalyst was characterized by various surface and bulk characterization techniques. The characterization study indicates that the synergistic interaction between Ba and CoCe could form more oxygen vacancies and peroxide species responsible for the activation of B-ol and TBHP. The formation of Ba(O2)1−xOx oxide (peroxide) was observed and could be responsible for the activation of B-ol. The optimum Ba doping enhances selectivity and yields benzaldehyde. However, the increase in Ba concentration on CoOx/CeO2−y could lead to the over-oxidation of B-ol to by-products.

中文翻译：

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Ba(O2)1-xOx 物质在提高 CoOx/CeO2-y 选择性氧化活性中的作用

通过共沉淀和沉积-沉淀法制备了一系列 Ba 掺杂的 CoOx/CeO2−y 催化剂。使用叔丁基氢过氧化物 (TBHP) 在没有溶剂的情况下研究了苯甲醇 (B-ol) 的选择性氧化 (selox) 催化剂，并将其活性与 Co0.5/Ce0.5 进行了比较。Ba 负载已随着时间和温度进行了优化，以用于 Selox 反应。该催化剂通过各种表面和本体表征技术进行表征。表征研究表明，Ba 和 CoCe 之间的协同相互作用可以形成更多的氧空位和过氧化物物种，负责 B-ol 和 TBHP 的活化。观察到 Ba(O2)1-xOx 氧化物（过氧化物）的形成，可能是 B-ol 活化的原因。最佳的 Ba 掺杂提高了选择性并产生了苯甲醛。