Facile synthesis of carbon supported Pt-nanoparticles with Fe-rich surface: A highly active catalyst for preferential CO oxidation

摘要

Rational design and controlled preparation of highly effective catalysts towards the preferential oxidation of CO have significant importance for the utilization of hydrogen energy. In this work, PtFe/C bimetallic catalysts have been successfully prepared by a one-pot surfactant-free polyol process, where Pt metal nanoparticles serve as catalysts to reduce Fe ions to metallic form on the surface. The resulting PtFe/C catalysts are investigated for a PROX CO reaction and characterized by ICP-AES, XPS, XRD, TEM, HS-LEIS. It is found that PtFe/C with an optimal Fe loading shows extremely high activity and stability. These characterization results reveal that PtFe/C adopts a structure of Fe rich surface and Pt dominated cores. The excellent catalytic performances over PtFe/C catalysts are attributed to the efficient activation of O_2 by Fe species located on the catalyst surface, indicated by the results of CO and O_2 pulse experiments. Additionally, other PtM/C (M = Cu, Ni) catalysts possessing the similar structure with that of PtFe/C can also be synthesized using the established one-pot surfactant-free polyol process.