Catalytic combustion has become a promising technology to address the accelerating volatile organic compounds (VOCs) emissions. In this work, cobalt modified ZSM-5 zeolite catalysts (3–18 wt % Co) were prepared to investigate the combustion of n-butane (one typical model component of VOCs). The performances of catalysts were evaluated by conducting experiments in a flow tube reactor. XRD, BET, FT-IR, and XPS were also utilized to characterize their physicochemical properties. A significant enhancement of the catalytic activity was demonstrated in terms of the cobalt supported over ZSM-5, with an optimal cobalt loading of 7 wt %. The excellent catalytic activity of 7 wt % Co-ZSM-5 is mainly attributed to a higher concentration of active surface Co³⁺ species. Furthermore, DFT calculations indicated that the role of Co can enhance the activity by decreasing the activation barriers for C–H bond cleavage. In addition, the primary reaction mechanism of n-butane combustion on Co-ZSM-5 was also revealed.

中文翻译：

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Co-ZSM-5催化剂上催化燃烧消除正丁烷

催化燃烧已成为解决加速挥发性有机化合物（VOC）排放的有前途的技术。在这项工作中，制备了钴改性的ZSM-5沸石催化剂（Co含量为3-18 wt％），以研究正丁烷（VOCs的一种典型模型组分）的燃烧。通过在流管反应器中进行实验来评估催化剂的性能。XRD，BET，FT-IR和XPS也用于表征其理化性质。相对于ZSM-5负载的钴而言，催化活性得到了显着提高，最佳钴负载量为7 wt％。7 wt％Co-ZSM-5的出色催化活性主要归因于较高的活性表面Co ³⁺浓度种类。此外，DFT计算表明，Co的作用可以通过降低C–H键裂解的激活障碍来增强活性。此外，还揭示了正丁烷在Co-ZSM-5上燃烧的主要反应机理。