Thermal Stability of Metal-Organic Frameworks and Encapsulation of CuO Nanocrystals for Highly Active Catalysis

ACS Applied Materials & Interfaces
Hsuan-Lan WangDe-Hao Tsai

Abstract

We report an aerosol-based approach to study the thermal stability of metal-organic frameworks (MOFs) for gas-phase synthesis of MOF-based hybrid nanostructures used for highly active catalysis. Temperature-programmed electrospray-differential mobility analysis (TP-ES-DMA) provides the characterization of temperature-dependent morphological change directly in the gas phase, and the results are shown to be highly correlated with the structural thermal stability of MOFs determined by the traditional measurements of porosity and crystallinity. The results show that MOFs underwent thermal decomposition via simultaneous disassembly and deaggregation. Trimeric Cr-based MIL-88B-NH2 exhibited a higher temperature of decomposition ( Td), 350 °C, than trimeric Fe-based MIL-88B-NH2, 250 °C. For UiO-66, a significant decrease of Td by ≈100 °C was observed by using amine-functionalized ligands in the MOF structure. Copper oxide nanocrystals were successfully encapsulated in the UiO-66 crystal (Cu xO@UiO-66) by using a gas-phase evaporation-induced self-assembly approach followed by a suitable thermal treatment below Td (i.e., determined by TP-ES-DMA). Cu xO@UiO-66 demonstrated a very high catalytic activity and stability to CO oxidation, sh...Continue Reading

References

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Citations

Nov 21, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Gulshan KumarRajeev Gupta
Jan 23, 2020·Nanomaterials·Luis A LozanoJuan M Zamaro
Oct 24, 2020·ChemPlusChem·Axel X CanatelliFederico Roncaroli
Oct 10, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yu-An SunDe-Hao Tsai

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