Abstract
Zeolites coking has been studied by129Xe-NMR technique. The distribution of the coke is heterogeneous on the supercage surface at low cokage level. When coking increases up to 10% the supercages are lined with coke and the residual internal volume consists of narrow channels. Beyond 10% the coke also affects the external surface of the zeolites, with the formation of coke microcavities between the crystallites. This technique has also enabled us to show the role of extra-framework Al in the cracking activity of zeolites.
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Barrage, M.C., Bonardet, J.L. & Fraissard, J. 129Xe-NMR study of coke distribution in dealuminated HY zeolites. Catal Lett 5, 143–154 (1990). https://doi.org/10.1007/BF00763946
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DOI: https://doi.org/10.1007/BF00763946