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　degrees　C　with　a　T-50　=　285　degrees　C.　The　temperature　for　50%　of　soot　combustion　was　lower　than　that　of　conventional　Ag-based　catalysts　to　more　than　50　degrees　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　oxygenspecies.　As　a　result,　the　structure　modifications　of　Ag　by　the　addition　of　Cu　strongly　intensified　the　catalytic　performance.　(C)　2017　The　Research　Center　for　Eco-Environmental　Sciences,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.