Abstract
The effect of Sn promoters on the performance of Pt-Sn/γ-Al 2O 3 catalysts for the long-chain paraffins dehydrogenation to mono-olefins was studied by n-dodecane dehydrogenation. The catalysts were characterized by N 2 adsorption-desorption, mercury intrusion porosimetry, CO pulse chemisorption, X-ray photoelectron spectroscopy and thermogravimetric analysis. Results show that the Pt-Sn/γ-Al 2O 3 catalysts exhibit the optimal catalytic performance when the Sn:Pt (mole ratio) of the catalysts is 3. While keeping on increasing the amount of Sn, the catalytic dehydrogenation activity of the catalysts is decreased with the formation of Sn 0 and Pt-Sn alloy. Moreover, the catalytic stability of the catalysts is enhanced after the addition of Sn. And with the increasing of Sn loading, the selectivity to mono-olefins of the Pt-based γ-Al 2O 3 catalysts is also greatly increased.
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