Ordered　mesoporous　Mn2O3　(meso-Mn2O3)　and　meso-Mn2O3-supported　Pd,　Pt,　and　Pd-Pt　alloy　x(PdyPt)/meso-Mn2O3;　x　=　(0.10-1.50)　wt%;　Pd/Pt　molar　ratio　(y)　=　4.9-5.1　nanocatalysts　were　prepared　using　KIT-6-templated　and　poly(vinyl　alcohol)-protected　reduction　methods,　respectively.　The　meso-Mn2O3　had　a　high　surface　area,　i.e.,　106　m(2)/g,　and　a　cubic　crystal　structure.　Noble-metal　nanoparticles　(NPs)　of　size　2.1-2.8　nm　were　uniformly　dispersed　on　the　meso-Mn2O3　surfaces.　Alloying　Pd　with　Pt　enhanced　the　catalytic　activity　in　methane　combustion;　1.41(Pd5.1Pt)/meso-Mn2O3　gave　the　best　performance;　T-10%,T-　T-50%,T-　and　T-90%　(the　temperatures　required　for　achieving　methane　conversions　of　10%,　50%,　and　90%)　were　265,　345,　and　425　degrees　C,　respectively,　at　a　space　velocity　of　20000　mL/(g.h).　The　effects　of　SO2,　CO2,　H2O,　and　NO　on　methane　combustion　over　1.41(Pd5.1Pt)/meso-Mn2O3　were　also　examined.　We　conclude　that　the　good　catalytic　performance　of　1.41(Pd5.1Pt)/meso-Mn2O3　is　associated　with　its　high-quality　porous　structure,　high　adsorbed　oxygen　species　concentration,　good　low-temperature　reducibility,　and　strong　interactions　between　Pd-Pt　alloy　NPs　and　the　meso-Mn2O3　support.　(C)　2016,　Dalian　Institute　of　Chemical　Physics,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.　All　rights　reserved.