Polymethyl　methacrylate-templating　and　ethylene　glycol　reduction　methods　were　adopted　to　prepare　the　nanosized　Pt　catalysts　(x　wt%　Pt/3DOM　Mn2O3　;　x　=　0.2-2.3)　that　were　partially　embedded　in　the　skeleton　of　three-dimensionally　ordered　macroporous　(3DOM)　Mn2O3.　These　materials　possessed　a　surface　area　of　33-36　m(2)/g,　with　the　Pt　NPs　(3.6-4.4　nm　in　size)　being　well　embedded　in　the　skeleton　of　3DOM　Mn2O3.　The　2.3　wt%　Pt/3DOM　Mn2O3　sample　showed　the　best　activity　and　the　lowest　apparent　activation　energy　(41　kJ/mol)　for　toluene　combustion,　which　was　related　to　its　high　adsorbed　oxygen　species　concentration　and　good　low-temperature　reducibility.　Compared　with　2.0　wt%　Pt/3DOM　Mn2O3-imp　derived　from　the　colloid　adsorption　method,　2.3　wt%　Pt/3DOM　Mn2O3　exhibited　a　better　catalytic　stability　within　60　h　of　toluene　combustion.　After　calcination　at　650　degrees　C　for　3　h,　the　average　particle　size　of　Pt　nanoparticles　(NPs)　in　2.3　wt%　Pt/3DOM　Mn2O3　grew　up　slightly　from　4.3　to　4.9　nm　and　toluene　conversions　decreased　slightly,　while　that　of　Pt　NPs　in　2.0　wt%　Pt/3DOM　Mn(2)O(3-)imp　increased　greatly　from　4.4　to　13.7　nm　and　toluene　conversions　dropped　significantly.　Effects　of　H2O,　CO2,　and　SO2　on　activity　of　2.3　wt%　Pt/3DOM　Mn2O3　and　2.0　wt%　Pt/3DOM　Mn2O-imp　were　also　examined.　Partial　deactivation　induced　by　H2O　or　CO2　addition　was　reversible,　whereas　that　due　to　SO2　introduction　was　irreversible.　It　is　concluded　that　the　strong　interaction　between　Pt　NPs　and　3DOM　Mn2O3　was　responsible　for　excellent　stability　of　the　partially　Pt-embedded　3DOM　Mn2O3　sample　in　toluene　combustion.