In　this　study,　the　effects　of　copper　(Cu)　additive　on　the　catalytic　performance　of　Ag/SBA-15　in　complete　soot　combustion　were　investigated.　The　soot　combustion　performance　of　bimetallic　Ag–Cu/SBA-15　catalysts　was　higher　than　that　of　monometallic　Ag　and　Cu　catalysts.　The　optimum　catalytic　performance　was　acquired　with　the　5Ag　1　-Cu　0.1　/SBA-15　catalyst,　on　which　the　soot　combustion　starts　at　T　ig　=　225°C　with　a　T　50　=　285°C.　The　temperature　for　50%　of　soot　combustion　was　lower　than　that　of　conventional　Ag-based　catalysts　to　more　than　50°C　(Aneggi　et　al.,　2009).　Physicochemical　characterizations　of　the　catalysts　indicated　that　addition　of　Cu　into　Ag　could　form　smaller　bimetallic　Ag–Cu　nanolloy　particles,　downsizing　the　mean　particle　size　from　3.7　nm　in　monometallic　catalyst　to　2.6　nm　in　bimetallic　Ag–Cu　catalyst.　Further　experiments　revealed　that　Ag　and　Cu　species　elicited　synergistic　effects,　subsequently　increasing　the　content　of　surface　active　oxygen　species.　As　a　result,　the　structure　modifications　of　Ag　by　the　addition　of　Cu　strongly　intensified　the　catalytic　performance.　©　2017