Effect of potassium addition on bimetallic PtSn supported 0-Al203 catalyst for n-butane dehydrogenation to olefins

PtSn/O-Al203 catalysts with different amount of potassium (0.4, 0.7, 0.95, 1.2 and 1.45 wt.%) were prepared by an impregnation method, and their catalytic activity in n-butane dehydrogenation was investigated at 823K, an atmospheric pressure and a GHSV of 18,000 mL(gcath)-1. The compositions listed in order of n-C4= yields at 823K were as follows: K0.95(PtSn)1.5 >(PtSn)1.5 >K0.4(PtSn)1.5 >K0.7(PtSn)1.5 >Kt 2(PtSd)1.5 >Kt 45(PtSn)1.5 >K0.9(Pt)1.5. The K0.9(Pt)1.5 and K0.95( Sn)1.5 catalyst severely deactivated in n-butane dehydrogenation. The (PtSn)1.5 (without K) catalyst showed the highest n-butane conversion, while K0.95(PtSn)1.5 did the highest n-C4= yield. The small amount of potassium on bimetallic PtSn/O-Al2 03 catalyst improved n-C4= selectivity, but slightly decreased n-butane conversion, resulting in the increase of n-C4= yield. The effect of potassium was caused by blocking the acid sites of Pt catalyst. The TPR and HAADF STEM-EDS study suggested the reduction procedure of the Pt, Sn and K species. However, the higher loaded potassium (1.2 and 1.45 wt.%) doped (PtSn)1.5 catalysts were rather highly deactivated because the sizes of Pt particles were increased by weakening the interaction between Pt and Sn. The n-C4= selectivity of the (PtSn)1.5 catalyst increased with respect to the reaction, while that of the potassium doped catalysts maintained the high n-C4= selectivity from the beginning of the reaction. Also, different alkali metals (Ca, Na and Li) were tested for the comparison with K. The potassium doped catalyst showed the highest n-C4= yield among the other alkali metals for n-butane dehydrogenation. C) 2013 Elsevier B.V. All rights reserved.