The hydrogenation of 2-ethyl-5,6,7,8-tetrahydroanthraquinone (THEAQ) at the oxygen in the presence of a palladium-supported catalyst is a key step in the industrial production of hydrogen peroxide. Palladium is a very active catalyst in THEAQ hydrogenation, therefore mass-transfer limitation strongly affects reaction rates. In industrial plants, the performance of the catalyst slowly decreases because of deactivation. The hydrogenation of THEAQ is a zero-order reaction with respect to hydrogen and a first order reaction with respect anthraquinone. The kinetics of the catalyst deactivation has been studied in a laboratory continuous reactor. Two types of catalyst poisoning are operative, a reversible one, related to the presence of water, and a permanent one, probably due to the condensation of two or more anthraquinone molecules on the palladium surface. The kinetic data obtained from laboratory runs are used to simulate the performance in industrial plants. © 1994, Elsevier Science & Technology. All rights reserved.
Deactivation of the palladium catalyst in the hydrogenation of 2-ethyl-5,6,7,8-tetrahydroanthraquinone / Santacesaria, E.; Di Serio, M.; Velotti, R.; Leone, U.. - 88:C(1994), pp. 597-602. [10.1016/S0167-2991(08)62794-9]
Deactivation of the palladium catalyst in the hydrogenation of 2-ethyl-5,6,7,8-tetrahydroanthraquinone
E. Santacesaria;M. Di Serio;
1994
Abstract
The hydrogenation of 2-ethyl-5,6,7,8-tetrahydroanthraquinone (THEAQ) at the oxygen in the presence of a palladium-supported catalyst is a key step in the industrial production of hydrogen peroxide. Palladium is a very active catalyst in THEAQ hydrogenation, therefore mass-transfer limitation strongly affects reaction rates. In industrial plants, the performance of the catalyst slowly decreases because of deactivation. The hydrogenation of THEAQ is a zero-order reaction with respect to hydrogen and a first order reaction with respect anthraquinone. The kinetics of the catalyst deactivation has been studied in a laboratory continuous reactor. Two types of catalyst poisoning are operative, a reversible one, related to the presence of water, and a permanent one, probably due to the condensation of two or more anthraquinone molecules on the palladium surface. The kinetic data obtained from laboratory runs are used to simulate the performance in industrial plants. © 1994, Elsevier Science & Technology. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
