Pt　catalysts　supported　on　TiO2　and　CeO2-TiO2　(Pt/TiO2　and　Pt/CeO2-TiO2)　were　prepared　by　a　two-step　precipitation-deposition　method,　respectively.　As　compared　to　Pt/TiO2,　Pt/CeO2-TiO2　exhibits　a　higher　thermo-catalytic　activity　and　stability　for　CO+NO　reaction,　and　also　exhibits　a　stronger　effect　of　ultraviolet　light　(UV)　on　promoting　this　reaction.　The　in-situ　FTIR　results　indicate　that　the　doped　CeO2　can　significantly　improve　the　adsorption　of　NO　at　Pt/CeO2-TiO2,　while　UV　light　further　enhance　the　adsorption　of　NO　and　its　activation.　Based　on　the　results　of　Raman　spectrum,　electron　paramagnetic　resonance　and　the　X-ray　photoelectron　spectroscopy　testing,　it　is　proposed　that　UV　irradiation　can　cause　the　increase　in　surface　electron　density　of　Pt　nanoparticles　by　the　photo-induced　electron　transfer　from　TiO2　to　Pt.　Moreover,　the　doped　CeO2　can　further　improve　the　electron　transfer　from　TiO2　to　Pt　through　a　process　of　Ce4+→Ce3+　under　UV　irradiation,　resulting　in　the　adsorption　and　activation　of　CO　and　NO　species　at　Pt/CeO2-TiO2.　This　result　also　indicates　that　the　photo-excitation　of　supports　can　strengthen　the　strong　interaction　between　support　and　metal　nanoparticles,　and　then　promote　the　thermo-catalytic　reactivity　of　catalysts.　©　2015　Elsevier　B.V.