In　this　study,　carbon　monoxide　catalytic　oxidant　MoSnCoOx　was　prepared　by　coprecipitating　method　to　investigate　the　effect　of　MoO3　addition　amount　on　catalyst　activity.　Meanwhile,　the　sulfur　and　water　resistance　of　the　catalysts　were　researched　by　simulating　the　industrial　conditions　of　sintering　smoke　emission.　The　samples　were　studied　using　BET,　XRD,　SEM　and　H2-TPR　techniques.　The　results　revealed　that　catalyst　added　with　0.5%　MoO3　had　better　activity　than　the　original　Sn9Co91O2　catalyst　and　its　efficiency　reached　98.04%　at　70　°C.　After　21　h　reaction　with　sulfur　and　water　in　the　flue　gas,　the　catalyst　efficiency　only　decreased　to　89.75%.　According　to　the　results　of　characterization,　Mo0.5Sn9Co90.5O2　catalyst　could　better　resist　sulfur　and　water,　because　the　presence　of　MoO3　not　only　reduced　the　crystallinity　of　the　catalyst,　but　it　also　increases　the　specific　surface　area　and　oxidation　capacity.　©　Published　under　licence　by　IOP　Publishing　Ltd.