Abstract: The characteristic study,by means of in-situ IRspectroscopy, of chemisorbed species on the Ni-catalysts for the partial oxidation of methane（POM）to syngas demonstrated the existence of CH_x（a）and H_xCO（a）adspecies on the functioning Ni-catalysts, Several designed experimental investigations on the reactivities of methane with CO₂ and with O₂,respectively,over the Ni-catalysts, and of CO₂ with the prereduced Ni-catalyst,ats well as of the deposited carbon with CO₂ and with O₂,respectlvely,liave been carried out and the reLqults were unfavorable to the two-step mechanistic interpretation proposed for the POMreaction.By means of tlie BOC-MP Approach,energetics of a set of elementary reactions,which may be involved in the POM process,on the clean（111）surface of Ni,Fe,Cu and Pd, re- spectively,has been studied.The result;of the experiments and the calculation of the present work favor the direct catalytic dissociation-plus-surface oxidation-plus-further debdrogenation mechanism as the dominant pathway making major contribution to the POM reaction.

Key words: Partial oxidation of methane, Syngas, Chemisorbed species, Energetics.Mechanism