Systematic study of the chemical and hydrothermal stability of selected “stable” Metal Organic Frameworks

• Very few MOFs show a good chemical stability after 2 months exposure time.
• NH2-MIL-101 (Al) show a very low stability and can be easily converted into NH2-MIL-53.
• The Langmuir surface area of MIL-101 (Cr) can be increased by treatment with acid of base.

In this work, the hydrothermal and chemical stability towards acids, bases, air, water, and peroxides of Metal Organic Frameworks, that are commonly considered to be stable, is presented. As a proof of stability both the crystallinity and porosity are measured before and after exposure to the stress test. The major part of the MOFs examined in this study show a good hydrothermal stability except for UiO-67, NH2-MIL-101 (Al) and CuBTC. The chemical stabilities towards acids and bases show a similar tendency and an ordering can be proposed as: MIL-101(Cr) > NH2-UiO-66 > UiO-66 > UiO-67 > NH2-MIL-53 > MIL-53(Al)>ZIF-8 > CuBTC > NH2-MIL-101(Al). In the tests with H2O2 most materials behaved poorly, only the UiO-66 and NH2-UiO-66 frameworks show a good stability.

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