Two-Dimensional Xenon-129 Exchange NMR Measurements of Xenon Dynamics in Na-A Zeolite
Two-dimensional(2D) exchange NMR is a powerful tool for measuring the dynamics and energetics of adsorbed xenon atoms undergoing slow exchange between the α-cages of Na-A zeolite. In this proceedings, we resent recently published results, as well as additional discussion and data obtained, using 2D129Xe NMR to determine rate coefficients for intercage xenon hopping and to correlate them with adsorption and activation energies. Variabletemperature experiments establish the activation energy for hopping between α-cages to be 60±10 kJ/mol. The dependence of these kinetic and thermodynamic quantities on xenon occupancy of the α-cages reflects the importance of intracage interactions on the behavior of the adsorbed guest molecules.
Studies in Surface Science and Catalysis
DOI of Published Version
Janicke, M.; Chmelka, B. F.; Larsen, R. G.; Shore, Jay S.; Schmidt-Rohr, K.; Emsley, L.; Long, H.; and Pines, Alex, "Two-Dimensional Xenon-129 Exchange NMR Measurements of Xenon Dynamics in Na-A Zeolite" (1994). Chemistry and Biochemistry Faculty Publications. 93.