Low-temperature　oxidation　of　carbon　monoxide　(CO)　is　one　of　the　most　studied　reactions　because　of　its　scientific　and　industrial　applications.　In　this　study,　we　discovered　that　the　low-temperature　CO　oxidation　activity　over　Pt/MnOx　catalyst　could　be　enhanced　by　a　novel　beta-MnO2　support　material.　Nearly　complete　CO　conversion　was　obtained　over　the　Pt/MnOx　catalyst　below　100　degrees　C　under　our　catalysis　conditions.　TOF　(turnover　frequency)　of　Pt/MnOx　was　five　and　nine　times　that　of　Pt/MnOx-COM　(COM,　commercial)　and　Pt/Al2O3　at　150　degrees　C,　respectively.　The　combined　results　of　X-ray　diffraction　(XRD)　Rietveld　refinement　of　fresh　and　spent　catalysts,　CO-temperature-programmed　desorption　(CO-TPD)　and　diffuse　reflectance　infrared　Fourier　transform　(DRIFT)　spectroscopy　allowed　us　to　conclude　that　the　O-2　molecules　exhibited　strong　adsorption　and　activation　ability　on　the　surface　of　Pt/MnOx　compared　to　that　on　the　surface　of　Pt/MnOx-COM.　From　the　H-2-TGA　(weight　loss)　and　DTGA　results,　we　confirmed　that　strong　metal-support　interactions　exist　between　Pt　and　MnOx　via　formation　of　Mn-O-Pt　bonds　for　both　catalysts.　Moreover,　by　combining　the　results　of　Rietveld　refinement　of　XRD,　Raman,　CO-TPD　and　O-2-TPD　(inlet　CO　and　inlet　CO/O-2　mixture　gases　as　adsorbates,　respectively)　analyses,　we　inferred　that　the　interfacial　lattice　oxygen　in　Pt/MnOx　might　be　the　active　oxygen　species　for　low-temperature　CO　oxidation.