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

Pt based binary catalysts, which were adulterated with Feseries elements, viz Fe, Co, and Ni,were prepared using microwave heating method, with carbon black as carrier andglycol as solvent. Microstructure of the catalysts was characterized by TEM, XRD, EDX and XPS. Results showed that active metal particles wereevenly distributed on carrier’s surface. After adulterated by Fe, Co, Ni, thedistribution of active metal particles’ size became narrower and average sizedecreased from 4.57nm to 2.17nm, 2.41nm, 2.55nm, respectively. The catalystswere loaded on foam nickel (FN) with polytetrafluoroethylene latex to obtain Ptbased hydrophobic catalysts, and then their activity for hydrogen―water liquidphase catalytic exchange (LPCE) was tested. Compared with Pt/C/FN hydrophobiccatalyst, the catalytic activity of Pt based binary hydrophobic catalystsadulterated with transition metals increased in evidence. The sequence of thesecatalysts’ activity was as follows, PtFe/C/FN>PtCo/C/FN> PtNi/C/FN>Pt/C/FN. The increase of catalytic activity results from the decrease ofactive metals particles’ size, moreover, it could be attributed to thedissociation property of water on Fe series metals’ surface to some extent.