TAP studies of Pt–Sn–K/?-Al2O3 catalyst for propane dehydrogenation

Chemical Engineering Journal, Volume 171, Issue 3, 15 July 2011, Pages 1317-1323
Special Section: Symposium on Post-Combustion Carbon Dioxide Capture
TAP studies of Pt–Sn–K/?-Al2O3 catalyst for propane dehydrogenation
M.P. Lobera (a, c), C. Téllez (a), J. Herguido (a), Y. Schuurman (b), M. Menéndez (a)
jhergui@unizar.es
a Aragon Institute for Engineering Research (I3A), University of Zaragoza, 50009 Zaragoza, Spain
b Institut de Recherches sur la Catalyse, CNRS, 2 Avenue A. Einstein, 69626 Villeurbanne, France
c Instituto de Tecnología Química (UPV-CSIC), Avenida de los naranjos s/n, 46022 Valencia, Spain
Abstract
Incipient wet impregnation was used to prepare a Pt–Sn–K/?-Al2O3 catalyst
Describes a temporal analysis of products (TAP) reactor for propane dehydrogenation. Previously to TAP analyses, the catalyst samples were used for propane dehydrogenation in two different reactors: a conventional fluidized bed reactor (FBR) where the catalyst was deactivated in time; and a two zone fluidized bed reactor (TZFBR) where propane and oxygen are fed at different levels, providing separated zones for the reaction and catalyst regeneration thus allowing a continuous mode operation. Samples of catalyst were obtained at several axial positions in the bed. The amount of coke deposited on the catalyst surface has been determined by thermogravimetric analysis. Results of TAP show that activation energies for propane conversion are markedly different for catalysts used in FBR and TZFBR; these differences have been related to the different nature of coke present on the catalyst surface
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