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:　2Mn3+　⇄　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.　Graphical　Abstract:　(Figure　presented.).　©　Akadémiai　Kiadó,　Budapest,　Hungary　2024.