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).
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