摘要
Hydrothermal and catalytic stability of UIO-66 MOFs with defective structures are critical aspects to be considered in their catalytic applications,especially under the conditions involving water,moisture and/or heat.Here,we report a facile strategy to introduce the macromolecular acid group to UIO-66 to improve the stability of the resulting UIO-66−PhSO3H MOF in aqueous phase catalysis.In detail,UIO-66−PhSO3H was obtained by grafting benzenesulfonic acid on the surface of the pristine UIO-66 to introduce the hydrophobicity,as well as the Brønsted acidity,then assessed using catalytic hydrolysis of cyclohexyl acetate(to cyclohexanol)in water.The introduction of hydrophobic molecules to UIO-66 could prevent the material from being attacked by hydroxyl polar molecules effectively,explaining its good structural stability during catalysis.UIO-66−PhSO3H promoted the conversion of cyclohexyl acetate at ca.87%,and its activity and textural properties were basically intact after the cyclic stability tests.The facile modification strategy can improve the hydrothermal stability of UIO-66 significantly,which can expand its catalytic applications in aqueous systems.
基金
This project has received funding from the European Union’s Horizon 2020 Research and Innovation Program(Grant No.872102)
The Chinese colleagues thank the National Key R&D Program of China(Grant No.2019YFE0123200)
Fan X and Pan Q thank the International Science&Technology Cooperation Program of Hainan Province(Grant No.GHYF2022006)for the collaborative research.
