Platinumwassupportedonγ-A1203andultra-stableYzeolite（USY）byanincipientwetnessimpregna-tionmethod.Thecatalystswerecharacterizedbynitrogenphysisorption,transmissionelectronmicroscopy（TEM）,CO/C3H8isothermaloxidations,NH3temperature-pro-grammeddesorption（NH3-TPD）andinfrared（IR）spec-troscopyofadsorbedprobemolecules（CO,C3H8andC3H8＋02）.ComparedwithPt/Al2O3,PtUSYcatalystshowsobviouslyhigheractivityforthecombustionofpropane.AfterestimatingthesizeeffectofPtparticlesandpropaneadsorptioncapacityofUSY,theexcellentactivityofPtUSYisalsoattributedtothestronginteractionsbetweenthepreciousmetalandtheacidiczeolite.Itinhi-bitstheoxidationofPtinanoxygen-richatmosphereathightemperatures,whichfacilitatetheinitialoxidationstepinvolvingtheC-HbondactivationonmetallicPtasreflectedbyinsitudiffusereflectanceinfraredFourier-transformed（DRIFT）spectra.
