Effect of aluminum modification on catalytic properties of PtSn-based catalysts supported on SBA-15 for propane dehydrogenation

摘要

The catalytic properties of PtSn-based catalysts supported on siliceous SBA-15 and Al-modified SBA-15,such as Al-incorporated SBA-15 (AlSBA-15) and alumina-modified SBA-15 (Al2O3/SBA-15),for propane dehydrogenation were investigated.Al2O3/SBA-15 was prepared either by an impregnation method using aluminum nitrate aqueous solution,or by the treatment of SBA-15 with a Al(OC3H7)3 solution in anhydrous toluene.N2-physisorption,FT-IR spectroscopy,solid-state 27Al MAS NMR spectroscopy,hydrogen chemisorption,XRF,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy and TPO were used to characterize these samples.Among these catalysts,the PtSn-based catalyst supported on Al2O3/SBA-15,which was grafted with Al(OC3H7)3,exhibited the best catalytic performance in terms of activity and stability The possible reason was due to the high Pt metal dispersion and/or the strong interactions among Pt,Sn,and the support.