The self-diffusion of benzene adsorbed in a Zr(IV)-based metal-organicframework (“UiO-67”) has been studied using pulsed gradient NMR. A low-field instrument operating at 20 MHz(for protons) has been used for this purpose. By varying the observation time,it has been possible to determine parameters that enters a theoretical expression developed by Kärger et al.1for analysis of such data.The life-time for the adsorbate within the pores of microcrystallites of the framework is one such parameter. Besides fundamental insight into the dynamic state of adsorbates in microporous materials, such information may also be of relevance in the design of modern catalyzers.
1: Kärger J, Pfeifer H, Heink W,Principlesand applications of self-diffusion by nuclear magnetic resonance. Adv Magn Res 12, 1 – 89, 1988.
harald.walderhaug@kjemi.uio.no
