Fluidized-Bed Isobutane Dehydrogenation over Alumina-Supported Ga₂O₃ and Ga₂O₃–Cr₂O₃ Catalysts

Abstract

Dehydrogenation of isobutane to isobutene over supported gallium oxide microspherical catalysts was investigated in a fluidized-bed reactor. A partially crystallized nanostructured aluminum hydroxide-oxide, which is a product of gibbsite centrifugal thermal activation (CTA) obtained using a CEFLAR technology, was used as a catalyst support. The structural and textural properties of Ga2O3/Al2O3 catalysts were characterized by a range of techniques including XRD, N2-physisorption, TPD of NH3 and CO2, IRS of adsorbed pyridine, and selective adsorption of a series of acid–base indicators. A Ga–Al oxide catalyst exhibited a stable performance close to activity of Cr–Al oxide catalysts not containing soluble hexavalent chromium. Upon addition of Cr2O3 (6 wt % of Cr), in amounts lower than in an industrial chromia/alumina catalyst (10.9% Cr), and 1% ZrO2 to 6%Ga/Al2O3 catalytic activity in isobutane dehydrogenation reaches the performance of the industrial KDM catalyst (“Sintez”, Russia).

Isobutane Dehydrogenation over InPtSn/ZnAl2O4 Catalysts: Effect of Indium Promoter

“…Isobutene is a very important raw material to produce polybutene, methyl tert -butyl ether, ethyl tert -butyl ether, etc., but the traditional methods for isobutene production such as steam cracking and fluid catalytic cracking units cannot fulfill the current fast growing requests. Alternatively, isobutane dehydrogenation provides an economical route to obtain isobutene from low-cost saturated and poorly reactive hydrocarbons . However, the dehydrogenation process requires low pressure and high temperature to achieve high yield of isobutene, as it is highly endothermic and equilibrium-limited.…”

Spectroscopy analysis of the active component of chromia-alumina dehydrogenation catalysts

“…It should be noted that the 2 x –3 x monolayer content (as for Cat-2 and Cat-3) is a typical chromium concentration for industrial catalysts. 4,17 Thus, the presented method can be used for theoretical evaluation and prediction of the activity of the industrial catalysts.…”

“…1,2 The investigations focused on increasing the efficiency of these catalytic systems are still of high interest and relevant today due to the continuous increase in the demand for C 3 –C 5 -olefins. 3–5…”

Analysis and Model-Based Description of the Total Process of Periodic Deactivation and Regeneration of a VOx Catalyst for Selective Dehydrogenation of Propane

“…Most of the light olefins are currently produced by highly optimized steam cracking processes. Since feedstocks are shifting progressively toward light alkanes, on-purpose technologies for the production of propene and other short chain alkenes have drawn more and more attention and are still considered in research [2][3][4][5]. Dehydrogenation of propane is a well-known alternative production route for producing propene that was already commercialized [6].…”