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Quadrangular-pyramid-octahedral CeO2 with defects was successfully prepared and first used as effective and reusable heterogeneous catalyst for photo- and thermal- synergistic catalytic synthesis of DMC, and it showed better catalytic performance than that of thermocatalysis alone. The corner defects may be the active site based on experimental result and DFT calculation. The CeO2 with specific defects was prepared by PECVD method and first applied for photo-thermal synergistic catalytic synthesis of DMC from CO2 and methanol, which showed superior catalytic performance to that of thermocatalysis alone, and the active site maybe the corner defect. [ABSTRACT FROM AUTHOR]

Pd-Ir mesocrystals with rough surface and highly branched structure were synthesized through a facile co-reduction method. The morphology evolution shows the mesocrystals were formed by oriented attachment of nanoparticles, and abundant defects sites as well as synergetic effect between building units were formed during mesocrystals oriented attachment process. Therefore, the supported Pd-Ir mesocrystals show a significant enhancement in catalytic performance in hydrogenation of 2-ethylanthraquinone compared with conventional Pd-Ir nanoparticles. The high activity can be ascribed to high densities of defect sites in Pd-Ir MCs catalyst, which facilitated H activation. In addition, the geometric effect of Pd-Ir MCs catalyst was responsible for inhibiting further hydrogenation of eAQH to undesired consecutive byproducts. Graphical Abstract: [ABSTRACT FROM AUTHOR]