Pristine　multiwalled　carbon　nanotubes　(MWCNTs)　were　modified　by　sodium　dodecyl　sulfate　(SDS).　Afterwards,　a　series　of　MnO2/MWCNTs　were　prepared　via　a　redox　method　and　used　in　selective　catalytic　reduction　(SCR)　of　NOx　at　80-180　degrees　C.　Structural　properties　and　catalytic　performance　were　investigated　by　specific　surface　area　measurements　(BET),　X-ray　diffraction　(XRD),　filed　emission　scanning　electron　microscope　(FESEM),　transmission　electron　microscope　(TEM),　X-ray　photoelectron　spectroscope　(XPS),　and　H-2　temperature-programmed　reduction　(H-2-TPR).　The　characterization　results　indicate　that　the　nanoflaky　MnO2　highly　disperse　on　MWCNTs.　The　results　show　that　the　low-temperature　SCR　activities　of　MnO2/MWCNTs　catalysts　are　85%-100%　at　140-180　degrees　C　at　a　weight　hourly　space　velocity　of　210　L/(g(cat)center　dot　h),　higher　than　that　of　catalyst　fabricated　via　the　wet　impregnation　method.　The　10%　MnO2/MWCNTs　catalyst　displays　first-rate　SCR　activity,　which　is　attributed　to　its　low　crystallinity,　high　concentrations　of　Mn4+　and　oxygen　absorbtion　onto　the　catalyst　surface,　as　well　as　excellent　reducibility.　Additionally,　compared　to　the　MnOx/MWCNTs　catalyst,　the　10%　MnO2/MWCNTs　catalyst　exhibits　higher　resistance　to　H2O　and　SO2.