Abstract
Isomerization of n-butane to isobutane was investigated over H- and Pt- modified MCM-22, ZSM-5 and Beta zeolite catalysts. The acidic properties of catalysts, Pt- modification and modes of catalyst pre-treatment were observed to influence the conversion of n-butane, yield and selectivity to isobutane. The H-MCM-22 catalyst having larger amount Bronsted acid sites exhibited higher conversion of n-butane and yield to isobutane than H-MCM-22 with smaller amount of Bronsted acid sites. Pt-modification and its state played significant role in isomerization of n-butane. Pt modified catalysts directly reduced showed higher conversion of n-butane, yield and selectivity to isobutane than calcined and reduced. The physico-chemical properties of H- and Pt- modified MCM-22, ZSM-5 and Beta catalysts were investigated using characterization techniques such as X-ray powder diffraction, scanning electron microscope, X-ray fluorescence, X-ray photoelectron spectroscopy, nitrogen adsorption and FTIR.
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