The simultaneously enhancement of activity and selectivity during hydrogenation is of great challenge. Herein, by encapsulating Pt nanoparticles (NPs) into hierarchical defective metal-organic framework (MOF) of UiO-66, steric screening effect of the pores, Lewis acid sites of the nodes and metal-MOF synergy have been finely tuned and effectively utilized for selective hydrogenation. Benefiting from optimal meso/micropores, favorable Lewis acid sites and strengthened metal-support interaction, Pt NPs encapsulated in hierarchical UiO-66 exhibited superior performance in selective hydrogenation. With the properly loading of Pt NPs into suitable meso/microporous UiO-66, the conversion of cinnamaldehyde is increased from 18.2% to 85% along with the selectivity for cinnamyl alcohol being improved from 15.8% to 76% under 70 °C and 2 MPa. According to the results of an in-situ FTIR test, the Pt-acid intefaces in suitable hierarchical UiO-66 can effectively facilitate the activation of the C=O bonds. The conventional trade-off relationship between increasing selectivity and promoting activity for encapsulated metal catalysts has been broken on the as-developed catalyst. This study provides a promising strategy to optimize transformation efficiency by the design of tailored MOF-based framework for encapsulating metal NPs with needed steric effect and synergistic effect.

Breaking the activity-selectivity trade-off of Pt nanoparticles encapsulated in UiO-66 for hydrogenation by constructing suitable hierarchical structure

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