372414 The Evaluation of the Temperature Dependence of Gate-Opening Phenomena in ZIF-8

Wednesday, November 19, 2014: 12:30 PM
313 (Hilton Atlanta)
Brian Pimentel, Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA and Ryan Lively, Georgia Tech, Atlanta, GA

The onset of gate-opening behavior in ZIF-8 is evaluated through a detailed gas adsorption study. The sharp increase of adsorbent loading at threshold pressures in ZIFs occurs through a structural deformation of the flexible imidazolate linkers at the pore mouth, with potential applications to selective adsorption processes.  Increases in temperature show an expected decrease in adsorbent loading along with a transition from Type IV isotherms to Type I isotherms. The adsorbate pressures and loadings at gate-opening are evaluated as a function of adsorbate nature, and the disappearance of the phenomena is related to system variables.  Various gas isotherms are presented in a wide temperature range to investigate the thermodynamics of adsorption and structural deformation of ZIF-8.

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See more of this Session: Adsorbent Materials: MOFs
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