By　controlling　preparation　conditions,　a　series　of　catalysts　were　synthesized.　Among　them,　ST-400　presented　primary　CuMn2O4　spinel　phase　and　expectant　denitration　efficiency　at　low　temperature.　Then,　various　concentrations　Hexadecyl　trimethyl　ammonium　Bromide　(hereinafter　referred　to　as　CTAB)　were　added　into　ST-400.　Among　them,　0.3C-ST-400　showed　higher　NO　removal　rate,　more　acid　sites　and　greater　redox　performance.　What＇s　more,　due　to　the　strong　interaction　and　electron　transfer　of　metal　ions,　there　was　equilibrium:　2Mn(3+)　-＞＜-　Mn2+　+　Mn4+　and　Cu2+　+　Mn3+　-＞＜-　Cu+　+　Mn4+,　and　the　addition　of　CTAB　could　promote　the　equilibrium　to　the　right.　More　concentration　of　Mn4+　and　chemisorbed　oxygen　would　be　the　facilitation　for　catalytic　activity　at　low　temperatures.　In　situ　DRIFT　experiments　indicated　that　Langmuir-Hinshelwood　mechanism　plays　a　major　role　over　both　ST-400　and　0.3C-ST-400.　However,　compared　with　ST-400,　the　addition　of　CTAB　results　in　the　present　of　Eley-Rideal　mechanism　over　0.3C-ST-400.　Besides,　the　CTAB　promotes　the　adsorption　intensity　of　NH3　and　nitrate　species　as　well　as　the　conversion　to　active　nitrate　species,　which　will　markedly　stimulate　the　effect　of　Langmuir-Hinshelwood　mechanism.　In　consequence,　the　propre　addition　of　CTAB　is　a　novel　strategy　in　favor　of　NH3-SCR　activity-enhancement　research.