Rate Controlling Path for Catalytic Butane Dehydrogenation

Kinetics of the Isobutane-Isobutene-Hydrogen System Using Tracers

“…Taken together all forty-five runs give 7+5,6/7-5'6 = 1.00 ± 0.26. These results confirm earlier data of Happel and Atkins (1970) for hydrogenation and dehydrogenation in the system n-butane-nbutenes-hvdrogen. These results indicate that one or more rate-controlling steps exist in the single path of elementary reactions involving transformation of the hydrocarbon skeleton.…”

“…The apparatus was a continuous-flow differential reactor, previously described by Happel and Atkins (1970). The catalyst employed was Type A50 supplied by the Houdrv Process Corp., containing nominally 20% chromia.…”

Kinetic Modeling of Dehydrogenation of Isobutane on Chromia/Alumina Catalyst

“…The rate-determining step in the dehydrogenation of isobutane has been suggested to involve alkane adsorption, 15,16 whereas in the dehydrogenation of propane and n-butane, it has been proposed to involve the surface reaction of the adsorbed alkyl group. 11,12,18,19 Furthermore, results of tracer studies with 13 C-labeled isobutane and deuterium on chromia gel 20 and with deutero-propane on chromia/alumina 17 suggest a mechanism with the surface reaction as the slow step.…”

“…The kinetics and mechanism of alkane dehydrogenation on chromia/alumina catalysts have been explored in various publications. − However, the findings of these studies have not always been in agreement. Not only different mechanisms but also different rate-determining steps and, thus, different kinetic models have been proposed.…”