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The application of doping platinum cluster is one of the ways to reduce CO poisoning[1-2].Considering aluminium has small atomic mass and easy to get,we try to study the catalytic activity of Al-doping platinum clusters on dehydrogenation of methanol.In this work,DFT calculations were employed to investigate the activation mechanism of methanol dehydrogenation to CO on Pt2Al and Pt3 clusters.The results show that the dehydrogenation mechanism of methanol on Pt2Al cluster is comparable with Pt3 cluster.