Oxygen vacancies can be used as adsorption-activation sites for reactants, and they can also be used to regulate the electronic structure of catalysts in environmental catalytic oxidation. In the current research on thermal catalytic oxidation, one of the most important issues is the further regulation and design of superior CeO catalysts with abundant oxygen vacancies. Herein, this study reveals a crystallization-inducing strategy to manipulate the exposed morphology, crystal planes, and crystal boundary of CeO catalysts by adding styrene at the synthesis stage. The characterization results demonstrate that the induced activation of styrene can lead to the formation of abundant Ce-Ce crystal boundaries with rich oxygen vacancies in CeO-CH catalysts. Among the synthesized induced CeO-CH catalysts, the short bar-like CeO-CH-130–24 catalyst presented better catalytic activity for styrene oxidation (T = 149 °C). Moreover, it is found that such a morphological and crystal boundary structure evolution can improve the durability of CeO-CH-130–24. This study provides a novel strategy for modulating the concentration of oxygen vacancies in CeO catalysts.

中文翻译：

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诱导合成具有丰富晶界的CeO2促进气态苯乙烯催化氧化

氧空位可以作为反应物的吸附活化位点，也可以在环境催化氧化中用于调节催化剂的电子结构。当前热催化氧化研究中最重要的问题之一是进一步调控和设计具有丰富氧空位的优质CeO催化剂。在此，本研究揭示了一种结晶诱导策略，通过在合成阶段添加苯乙烯来控制 CeO 催化剂的暴露形态、晶面和晶界。表征结果表明，苯乙烯的诱导活化可以导致CeO-CH催化剂中形成丰富的Ce-Ce晶界和丰富的氧空位。在合成的诱导CeO-CH催化剂中，短棒状CeO-CH-130–24催化剂对苯乙烯氧化表现出更好的催化活性（T = 149 °C）。此外，人们发现这种形态和晶界结构的演变可以提高CeO-CH-130-24的耐久性。这项研究为调节 CeO 催化剂中氧空位浓度提供了一种新策略。