Nanosized　alpha-MnO2-supported　silver　catalysts　(xAg/nano-MnO2,　x　=　0-10.0　wt%)　were　prepared　by　the　incipient　wetness　impregnation　method　and　characterized　by　means　of　numerous　analytical　techniques.　Catalytic　activities　of　the　materials　were　evaluated　for　the　oxidation　of　CO　and　benzene.　It　is　shown　that　the　loading　of　silver　on　nano-MnO2　could　significantly　modify　the　catalytic　activities　and　the　catalytic　performance　of　xAg/nano-MnO2　strongly　depended　upon　the　Ag　loading,　among　which　5Ag/nano-MnO2　performed　the　best　for　the　addressed　reactions.　The　excellent　performance　of　5Ag/nano-MnO2　was　associated　with　the　highly　dispersed　Ag,　good　low-temperature　reducibility,　and　synergism　at　the　interface　of　Ag　and　MnO2　nanodomains.　(C)　2011　Elsevier　B.V.　All　rights　reserved.