Abstract
The performance of Pt−Sn/SAPO-34 novel catalyst was investigated for n-butane dehydrogenation. The catalyst was characterized by number of physiochemical techniques X-ray fluorescence (XRF), X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH3-TPD), hydrogen temperature-programmed reduction (H2-TPR), temperature-programmed oxidation (TPO), transmission electron microscopy (TEM), and O2-pulse coke measurement. The metallic contents, structure, acidity, and metallic dispersion were determined in order to explain catalyst superiority and functionality using SAPO-34 as support. Pt−Sn-based SAPO-34 supported catalyst was parametrically characterized in order to obtain superior control of dehydrogenation reaction stereochemistry. Above 91% of total olefins with 80% butene was achieved over Pt−Sn/SAPO-34. The weight hourly space velocity 2.8 h−1 and temperature 585 °C were found to be optimum for the higher dehydrogenation activity. The catalysts also showed very good hydrothermal stability in continuous reaction−regeneration cycles. The coke formation was mainly related to catalyst activity.
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