✍ Scribed by B. Y. Jibril
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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
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## Abstract The kinetic compensation effect (KCE) is a well‐known behavior pattern wherein a set of related reactions show a linear relationship between the calculated Arrhenius parameters, log~10~ __A__ and __E__~a~. Although various theoretical explanations have been advanced, none has yet found