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Kinetics of propane oxydehydrogenation on metals oxides and metals phosphates catalysts: Evidence of compensation effects
Author(s) -
Jibril B. Y.
Publication year - 2006
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20154
Subject(s) - propane , chemistry , arrhenius equation , dehydrogenation , catalysis , metal , activation energy , ethylene , propene , kinetics , inorganic chemistry , organic chemistry , physics , quantum mechanics
Abstract Kinetics of oxidative dehydrogenation of propane has been tested on three groups of catalysts; alumina‐supported metal oxides (MO) (where metal is V, Cr, Ni, Zr, Mo, or Ba), alumina‐supported rare earth metal oxides (RO) (where metal is Ce, Tb, Dy, Ho, Tm, or Yb), and metal phosphates (MP) (where metal is V, Cr, Mn, Ni, Zr, Mg, Ba, or Ce). They were found to be active and exhibited different selectivities to propylene, ethylene, and CO x (CO and CO 2 ). The Arrhenius parameters—apparent pre‐exponential factor (ln A app ) and activation energy E app )—were evaluated. Evidence of compensation effects was established through statistically significant linear relationship between ln A app and E app . The rates of propane conversions and CO x productions on MO and MP showed common compensation line different from that of RO. When the data for rates of production of propylene and ethylene were plotted, the line for the ethylene rate on MO appeared above that of propylene rate, contrary to the observation on MP and RO. An attempt was made to associate the differences in the behaviors of the catalysts with differences in the ensembles of chemisorbed species that form the respective active centers. © 2006 Wiley Periodicals, Inc. Int J Chem Kinet 38: 176–183, 2006