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Thiophene Poisoning and reactivation of a supported nickel hydrogenation catalyst: The effect of temperature
Author(s) -
Seoane X. L.,
Arcoya A.
Publication year - 1993
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280560116
Subject(s) - hydrogenolysis , thiophene , catalysis , ethylbenzene , nickel , chemistry , adsorption , photochemistry , catalyst poisoning , inorganic chemistry , organic chemistry , catalyst support
The extent and type of poisoning of an 8 wt% Ni/γ‐Al 2 O 3 catalyst by thiophene has been examined in ethylbenzene hydrogenation reaction, between 403 and 523 K. The results suggest that at the higher temperatures the deactivation can take place through two different mechanisms. In one case, the formation of ‘Ni‐S’ surface species on the more active sites at the beginning of the reaction, produces a slow and irreversible poisoning. In the other, the planar adsorption of thiophene on the other sites produces a fast and reversible deactivation. At lower temperatures, the second mechanism seems to be predominant due to the fact that the hydrogenolysis activity diminishes.