N. A. Pakhomov
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Received September 18, 2000
Abstract—The reasons and nature of the deactivation of spinel-supported bimetallic Pt–Sn, Pt–In, and Pt–Cu
catalysts in the steam dehydrogenation of C4–C5 paraffins are analyzed. The deactivation can be reversible and
irreversible. Reversible deactivation is associated with the effects of the composition of reaction medium and
gaseous medium for preliminary treatment on the surface composition of supported bimetallic alloys and with
the coking of catalysts. Irreversible deactivation can result from the irreproducibility of the phase composition
and dispersion of supported alloys in dehydrogenation–regeneration cycles and from the carbon erosion of cat-
alysts. This erosion consists in the removal of active metal particles to the bulk of carbon deposits. The forma-
tion of carbon deposits on the surfaces of spinel supports and bimetallic catalysts is considered. Recommenda-
tions for optimizing the composition and the operating conditions of catalysts are given in order to reduce the
effects of factors that result in reversible and irreversible deactivation.
Pleiades Publishing home page | journal home page | top
If you have any problems with this server, contact webmaster.