Spherical porous nanoclusters composed of NiO and CeO₂ nanoparticles were successfully developed by a refined gas-phase controlled synthesis method, which were shown to be useful for syngas production via a high-performance catalysis of dry reforming of methane (DRM) coupled with partial oxidation of methane (POM). The synthetic method combines the principles of aerosol-phase evaporation-induced aggregation of polyethylene glycol (PEG; as soft template) followed by thermal decomposition of the self-assembled precursor crystallites for the creation of mesopores in the hybrid nanostructure directly in gas phase. Specific surface area, pore volume, and metal surface area in the Ni–Ce–O hybrid nanostructure increased by using the PEG. The results show a remarkably high turnover frequency of methane (0.93 s^–1 at 600 °C) by using the developed Ni–Ce–O porous nanostructure as catalyst, where the H₂/CO ratio was tunable for attaining a high syngas selectivity. Both a high light-off stability and 100 h operation stability were achieved through a remarkable reduction of coke formation on the Ni–Ce–O hybrid nanostructure. The work demonstrates a facile aerosol route for fabricating hybrid nanoporous clusters as useful catalysts for methane-based combined reactions.

中文翻译：

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NiO和CeO ₂纳米颗粒的球形多孔纳米簇作为合成气生产的催化剂

通过精细的气相控制合成方法成功开发了由NiO和CeO ₂纳米颗粒组成的球形多孔纳米团簇，它们被证明可通过甲烷干重整（DRM）的高性能催化结合部分氧化而用于合成气生产甲烷（POM）。该合成方法结合了气溶胶相蒸发诱导的聚乙二醇（PEG；作为软模板）聚集的原理，然后对自组装前体微晶进行热分解，从而直接在气相中在杂化纳米结构中形成中孔。通过使用PEG，Ni-Ce-O杂化纳米结构中的比表面积，孔体积和金属表面积增加。结果表明，甲烷的周转频率非常高（0.93 s在600°C时为^–1），使用发达的Ni–Ce–O多孔纳米结构作为催化剂，其中H ₂ / CO比可调节以实现高合成气选择性。通过显着减少Ni–Ce–O杂化纳米结构上的焦炭形成，可以实现较高的起燃稳定性和100 h的运行稳定性。这项工作证明了制造混合纳米多孔团簇作为基于甲烷的联合反应的有用催化剂的简便气溶胶途径。