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Isobutane Dehydrogenation over InPtSn/ZnAl2O4 Catalysts: Effect of Indium Promoter
journal contribution
posted on 2018-07-30, 00:00 authored by Jianfeng Liu, Wei Zhou, Dongyu Jiang, Wenhai Wu, Changxi Miao, Yue Wang, Xinbin MaDehydrogenation
of saturated isobutane provides an alternative
process to produce isobutene from nonpetroleum resources. InPtSn/ZnAl2O4 catalysts with various In contents were prepared
by sequential impregnation for the isobutane dehydrogenation. The
catalysts were investigated by several characterizations such as X-ray
diffraction, N2 adsorption, H2 chemisorption,
NH3 temperature programmed desorption, pyridine-adsorbed
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy,
thermogravimetric analysis, and temperature-programmed oxidation.
We reveal that with the suitable addition of In component in the PtSn/ZnAl2O4 catalysts, the Pt dispersion increases, and
the surface acidity decreases. The presence of In improves the stability
of the reaction greatly because it is beneficial to stabilize the
oxidation states of SnOx. The excessive
addition of In will lead to decrease of the Pt dispersion and increase
of the surface acidity, which cause the decline in the catalytic activity.
The addition of 0.4 wt % In on PtSn/ZnAl2O4 catalyst
shows the optimized catalytic performance. The isobutane conversion
decreases from 54.7 to 40.5% within 8 h, and the isobutene selectivity
is above 95% even after 20 reaction–regeneration cycles.
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thermogravimetric analysisnonpetroleum resourcesalternative processPtSnisobutane dehydrogenationsequential impregnationPt dispersionIsobutane DehydrogenationH 2 chemisorptionsurface acidityPt dispersion increasesInPtSnX-ray diffractiontemperature-programmed oxidationIndium Promoter Dehydrogenationsurface acidity decreasesoxidation statesisobutane conversion decreasesSnO xcatalystNH 3 temperaturepyridine-adsorbed FourierX-ray photoelectron spectroscopyN 2 adsorption8 hisobutene selectivity
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