Abstract
The surfaces of platinum clusters in the supercages of NaY zeolite have been studied by ${}^{129}\mathrm{Xe}$ NMR over the temperature range 80--293 K. The sensitivity of this weakly perturbing technique makes it possible to reveal the heterogeneity of the electronic structure of the particle surface. The temperature dependence of the ${}^{129}\mathrm{Xe}$ spin-lattice relaxation indicates that the surface sites with the highest adsorption energy possess metallic character.
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