Preparation and Catalytic Activity of Pt Based Hydrophobic Catalysts Adulterated with Fe Series Elements

Abstract

Pt based binary catalysts,which were adulterated with Fe series elements,viz Fe,Co,and Ni,were prepared using microwave heating method,with carbon black as carrier and glycol as solvent.Microstructure of the catalysts was characterized by TEM,XRD,EDX and XPS.Results showed that active metal particles were evenly distributed on carrier's surface.After adulterated by Fe,Co,Ni,the distribution of active metal particles' size became narrower and average size decreased from 4.57nm to 2.17nm,2.41nm,2.55nm,respectively.The catalysts were loaded on foam nickel(FN) with polytetrafluoroethylene latex to obtain Pt based hydrophobic catalysts, and then their activity for hydrogen-water liquid phase catalytic exchange(LPCE) was tested.Compared with Pt/C/FN hydrophobic catalyst,the catalytic activity of Pt based binary hydrophobic catalysts adulterated with transition metals increased in evidence.The sequence of these catalysts' activity was as follows, PtFe/C/FNPtCo/C/FNPtNi/C/FNPt/C/FN.The increase of catalytic activity results from the decrease of active metals particles' size,moreover,it could be attributed to the dissociation property of water on Fe series metals' surface to some extent.