480682 Optimization of ZIF-7 and ZIF-8

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Maria Guadalupe Marquez Garcia1, Nasser Khazeni2 and Reza Foudazi1, (1)Chemical and Materials Engineering, New Mexico State University, Las Cruces, NM, (2)Chemical Engineering, Institute for Energy and the Environment/WERC, New Mexico State University, Las Cruces, NM

Metal organic frameworks are crystalline porous materials that have important structural and chemical properties. Their applications range from areas of gas storage, gas separation and catalysis. A subdivision of MOFs that has gained many interest are Zeolitic imidazolate frameworks. ZIFs are reported to be more stable than many other MOFs. They are three-dimensional structures constructed from tetrahedral metal ions bridged by imidazolate. ZIFs exhibit permanent porosity, high thermal and chemical stability. Several research has been done and many ZIFs have been reported. ZIF-8 and ZIF-7 stand out from the others due to their unique characteristics including high surface area. Therefore, a syntheses optimization of these two frameworks was essential for future scale-up processes and for new applications. To optimize the synthesis recipe of ZIF-7 and -8 with respect to the reaction yield, time and reactants waste, a series of experiments were performed under varied metal:linker ratios. Both ZIF-7 and ZIF-8 were found to have higher yields at a higher ratio of linker. The optimal metal to linker ratio was found to be 1:2.5, at which ratio the reaction yield was larger and the reaction took place in a shorter time. In addition, regarding the slight deviation from the stoichiometric ratio, linker waste is minimum in this ratio. As a result, excess linker enhances the reaction rate and a slight deviation form the stoichiometric ratio produced higher yields with minimum linker waste.

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