Dry reforming of methane (DRM) using CH4 and CO2 as feedstocks to catalytically produce high-value synthesis gas products has great application prospects. However, as a high-temperature heterogeneous catalytic reaction, the challenge lies in preparing efficient and stable catalysts for long-term operation. To enhance the catalytic performance by optimizing support, this study proposed regulating the catalyst structure and properties using Ce-based metal-organic framework (MOF) derivatives. Compared with the conventional Ni/CeO2, Ni/CeO2-MOF catalysts performed better in DRM. Especially, Ni/CeO2-UiO-66 demonstrated significant improvement in both catalytic activity and stability. It was also noticed that the Ni/CeO2-MOF catalysts had a potential benefit in limiting the conversion of carbon species to inactive forms given the relatively lower carbon gasification temperatures at their surfaces. The advantage of Ni/CeO2-MOF catalysts was attributed to their better void structure and reduction characteristics, as well as higher oxygen vacancy concentration and improved CO2 adsorption activation capability after pre-activation. This study revealed that MOF-derived supports had distinctive structural characteristics, which were manifested as an important component in high-temperature catalyst systems.

中文翻译：

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Ce-MOF 衍生氧化物作为形态可调催化剂载体在甲烷干法重整中的研究


以 CH4 和 CO2 为原料对甲烷进行干重整 （DRM） 催化生产高价值合成气产品具有很大的应用前景。然而，作为一种高温非均相催化反应，挑战在于制备高效稳定的催化剂以进行长期运行。为了通过优化载体来提高催化性能，本研究提出了使用 Ce基金属有机框架 （MOF） 衍生物调控催化剂的结构和性能。与传统的 Ni/CeO2 相比，Ni/CeO2-MOF 催化剂在 DRM 中表现更好。特别是，Ni/CeO2-UiO-66 在催化活性和稳定性方面均表现出显着改善。还注意到，鉴于其表面的碳气化温度相对较低，Ni/CeO2-MOF 催化剂在限制碳物质转化为非活性形式方面具有潜在益处。Ni/CeO2-MOF 催化剂的优势归因于其更好的空隙结构和还原特性，以及更高的氧空位浓度和预活化后改进的 CO2 吸附活化能力。本研究揭示了 MOF 衍生的载体具有鲜明的结构特征，表现为高温催化剂体系中的重要组分。