Abstract
An essential requirement for the proton exchange membrane fuel cell (PEMFC) is to deliver clean H 2 to the anode electrode, the kinetics of which are greatly hindered by traces of CO present from the upstream hydrocarbon reforming and water–gas shift processes. The removal of CO from hydrogen-rich stream to a PEMFC tolerant level, by selective oxidation (SELOX) of CO, has been studied over 1%Pt/Al 2O 3, 1%Pt-1%Sn/Al 2O 3, 1%Pt/Nb 2O 5 and 1%Pt-1%Sn/Nb 2O 5 catalysts. The Nb 2O 5-supported catalysts presented higher activity in SELOX reaction at low temperatures, but with lower CO selectivity. The results were explained in terms of platinum modification by the presence of niobia (SMSI effect) and tin (bimetallic effect).
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