Isobutene is the most versatile chemical intermediate of all C4 olefins. it used to be
Mainly used in the production of gasoline blending raw materials such as methyl tert-butyl ether (MTBE)
and ethyl tert-butyl ether (ETBE) by methanol and ethanol, respectively methyl amine
With the development and application of new technologies, catalytic dehydrogenation
The production of isobutene from isobutane has become an important way to increase production [1-2]. process
Dehydrogenation can be divided into two types: direct dehydrogenation and oxidative dehydrogenation
Dehydrogenation. It is well known that the direct dehydrogenation of isobutane has been achieved
Industrially, chromium supported on alumina or silica is used as an industrial catalyst.
The structure and activity of Cr catalysts have been extensively studied in an attempt to
To better understand the catalytic process of catalysts [3-5].
In recent years, studies on the kinetics and mechanism of photodehydrogenation
In these articles alkanes are explored and several kinetic models are proposed, based on
Plays on Langmuir-Hinshelwood, Eley-Rideal or Mars-van Krevelen type mechanics
It plays an important role in the study of catalytic mechanism. But due to the use of different catalysts
Different systems, reaction conditions and experimental methods have different mechanisms.
The rate-determining step, thus obtaining a different kinetic model. So far, dynamics and
The mechanism of isobutane dehydrogenation by different catalysts was studied [6-8]. most
They are oxidative dehydrogenation reactions with O2 or CO2 as the oxidant. However, about
The intrinsic kinetics of the direct dehydrogenation of isobutane are rare.
The research group developed the K-Cu-Cr/Al2O3 catalyst in the previous research,
Found to be highly catalytically active, exhibiting high stability and regenerative performance
within 100 hours. Therefore, in this work, the dehydrogenation reaction of isobutane over K-Cu-Cr/Al2O3 catalyst was investigated to elucidate the intrinsic kinetics of alkane dehydrogenation reactions. model of
The kinetics are derived on the basis of the Langmuir-Hinshelwood mechanism, and the rate determines
Steps and fit models were tested.