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Cyclohexene Hydroconversion Using Monometallic and Bimetallic Catalysts Supported on γ‐Alumina
Author(s) -
AboulGheit Ahmed K.,
AbdelHamid Sohair M.,
AboulFotouh Sameh M.,
AboulGheit Noha A. K.
Publication year - 2006
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200600105
Subject(s) - bimetallic strip , chemistry , catalysis , cyclohexene , dehydrogenation , chemisorption , activation energy , hydrogen , reaction rate constant , inorganic chemistry , enthalpy , organic chemistry , kinetics , thermodynamics , physics , quantum mechanics
The hydroconversion of cyclohexene (CHE) using monometallic catalysts containing 0.35wt% of Pt, Pd, Ir or Re on a γ‐alumina support, as well as bimetallic catalysts containing combinations of 0.35wt% Pt with 0.35wt% of either Pd, Ir or Re on γ‐alumina, were investigated in a plug flow‐type fixed‐bed reactor. The Cyclohexene (CHE) feed was injected continuously with a rate of 8.33 × 10 −3 mole h −1 on 0.2 g of catalyst using a simultaneous hydrogen gas flow of 20 cm 3 min −1 throughout a broad reaction temperature range of 50–400 °C. The dispersion of the metals in the catalysts was determined via H 2 or CO chemisorption. The activities of the monometallic catalysts were found to be in the order: Pd > Pt > Ir > Re, whereas those of the bimetallic catalysts were in the order: PtPd > PtIr > PtRe. Cyclohexene hydrogenation and dehydrogenation reactions using the current mono‐ and bimetallic catalysts were kinetically investigated applying the absolute reaction rate theory, whereby reaction rate constant, activation energy, enthalpy and entropy of activation were computed to explain surface variations on these catalysts.