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Kinetics of deactivation of bifunctional Pt/Al 2 O 3 Cl catalysts by coking
Author(s) -
Beltramini Jorge N.,
Wessel Timothy J.,
Datta Ravindra
Publication year - 1991
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690370607
Subject(s) - coke , methylcyclopentane , bifunctional , hydrogenolysis , chemistry , catalysis , metal , inorganic chemistry , kinetics , reaction rate constant , catalytic reforming , selectivity , organic chemistry , physics , quantum mechanics
The catalytic activity, product selectivity, and coke deposition were studied during methylcyclopentane (MCP) reforming on bifunctional Pt/Al 2 O 3 Cl reforming catalysts with different metal loadings, but constant metal dispersion as well as constant Cl loading. Surprisingly, the overall conversion of MCP was found to decrease as the metal content of the catalyst increased. Analysis of the coke by temperature programmed oxidation (TPO) revealed two distinct peaks, one associated with coke on the metallic function and the other associated with coke on the acidic function. The change of activity of the metal and acid functions with time was monitored by following the rates of hydrogenolysis and hydrocracking, respectively. A mechanistically‐based dual‐site model for the kinetics of coke formation and the resulting deactivation was developed. The model successfully correlates the experimental data and is an improvement over existing models, since it explicitly accounts for the deactivation of both the metal and the acid functions.