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Methanol oxidation on Pd,Pt and carbon supported PtRu/Vulcan bimetallic catalysts (E-TEK,Inc.) were studied at rome temperature by using cyclic voltammetry combined with on-line differential electrochemical mass spectrometry (DEMS).The main reation products CO2,formaldehyde and formic acid were determined quantitatively,by appropriate calibration procedures,current efficiencies of CO2 and product yields were calculated.Pd almost has no activity towards methanol oxidation.Addition of Ru in binary Pt catalysts lowers the onset potential for methanol oxidation.CO2 is formed in a serial reaction,while dissolved intermediates are also formed in a parallel reation.Ru promotes methanol oxidation to CO2 via COad,leading to a higher current efficiency of CO2.