Platinum nanoparticles (Pt NPs) immobilized on a N-doped graphene@Al₂O₃ hybrid support (Al₂O₃@CN_x) were synthesized and employed for low temperature CO oxidation. The superior catalytic activity was attributed to a strong metal–support interaction between Pt NPs and the N-doped graphene surface which was also confirmed in the direct dehydrogenation reaction.