Ion　exchange　method　was　used　to　fabricate　Cu-ETS-10　titanosilicate　catalysts,　which　possessed　high　activity,　N-2　selectivity　and　SO2　resistance　for　NOx　selective　catalytic　reduction　(SCR).　N-2　sorption　measurements　indicated　that　the　microporous　catalysts　had　high　surface　areas　of　288-380　m(2)/g.　The　Cu　content　and　speciation　were　investigated　by　inductively　coupled　plasma　atomic　emission　spectrometry,　H-2　temperature-programmed　reduction,　and　diffuse　reflectance　infrared　Fourier　transform　spectroscopy.　Various　Cu　species　coexisted　within　the　catalyst.　Isolated　Cu2+　species　were　the　active　sites　for　NH3-SCR,　the　number　of　which　initially　increased　and　then　decreased　with　increasing　Cu　content.　The　catalytic　activity　of　Cu-ETS-10　depended　on　the　isolated　Cu2+　species　content.　(C)　2014,　Dalian　Institute　of　Chemical　Physics,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.　All　rights　reserved.