摘要
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.