Insight in the mechanism of deactivation of a Pt/mordenite (MOR) catalyst during the isomerization of n-pentane
(2005) Comptes rendus. Chimie — Vol. 8, n° 3-4, p. 465-474 (2005)
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- The deactivation of a Pt/MOR catalyst and of a blank during the isomerization of n-pentane was studied measuring the catalytic performances under favorable deactivation conditions. Several samples at different steps of the deactivation were produced and analyzed by physico-chemical techniques for characterization (ICP, XRD, XPS, IR-pyridine, NMR, NH3-TPD and CO chemisorption) in order to get information about the consequences of the deactivation. Results showed that deactivation caused mainly a decrease of the zeolite acidity and loss of the platinum efficiency. Both phenomena are favored by the formation of carbon residue on the catalyst surface, which is the result of molecular recombination reactions (favored by high density and strength of acid sites, small pore diameters and probably by a small amount of octahedrally co-ordinated aluminum). This coke covers the acid sites (active for the reaction) and probably the platinum particle. Its nature is similar in all cases (blank and catalyst) and at all steps of the deactivation (slight or strong). Regeneration procedure under air is performed on deactivated catalysts. The catalyst regeneration allows a deactivated catalyst to recover its original activity. © 2005 Academie des sciences. Published by Elsevier SAS. All rights reserved.
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Lenoir, C., Rohr, F., Stocker, M., & Ruiz, P. (2005). Insight in the mechanism of deactivation of a Pt/mordenite (MOR) catalyst during the isomerization of n-pentane. Comptes rendus. Chimie, 8(3-4), 465-474. https://doi.org/10.1016/j.crci.2004.11.023 (Original work published 2005)