Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 19, Pages 16358-16366Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00389
Keywords
hierarchical zeolite; metal-organic framework; hierarchical FAU/ZIF-8 composites; aldol condensation; 5-HMF
Funding
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Thailand Research Fund (TRF) [MRG6180099]
- Office of Higher Education Commission (OHEC)
- Junior Research Fellowship Program of the French Embassy in Thailand
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The composite of hierarchical faujasite nanosheets and zeolitic imidazolate framework-8 (Hie-FAU ZIF-8) has been successfully prepared via a stepwise deposition of ZIF-8 on modified zeolite surfaces. Compared to the direct deposition of metal organic frameworks (MOFs) on zeolite surfaces, ZIF-8 nanospheres were selectively attached to the external surfaces of the MOF ligand-grafted FAU crystals because of the enhancing interaction between the zeolite and MOF in the composite. In addition, the degree of surface functionalization can be greatly enhanced because of the presence of hierarchical structures. This behavior leads to an increase in the deposited MOF content, improving the hydrophobic properties of the zeolite surfaces. Interestingly, the designed hierarchical composite exhibits outstanding catalytic properties as an acid base catalyst for the aldol condensation of 5-hydroxymethylfurfural with acetone. Compared to the isolated FAU and ZIF-8, a high yield of the product, 4-[5-(hydroxymethyl)furan-2-yl]but-3-en-2-one (67%), can be observed in the composite because of the synergistic effect between the Na+-stabilized zeolite framework and the imidazolate linkers bearing basic nitrogen functions. This opens up interesting perspectives for the development of new organic and inorganic hybrid materials as heterogeneous acid base catalysts.
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