Development　of　the　efficient　MnOx/TiO2　catalysts　with　high　dispersibility　and　stability　of　denitration　reaction　for　NH3-SCR　is　crucial　to　control　NOx　emission　at　low　temperature.　Herein,　we　propose　mineral　polarization　effect　modification　on　the　surface　of　MnOx/TiO2　denitration　catalytic　material　via　coprecipitation　method　using　tourmaline　as　modifying　agent,　and　evaluate　its　performance　of　NOx　removal.　Particularly,　tourmaline-MnOx/TiO2　catalysts　presented　a　high　denitration　rate　about　97%　under　the　condition　of　1000　ppm　NO,　1000　ppm　NH3　and　5%　O2　at　200　°C　and　maintained　above　91%　removal　efficiency　within　10　h,　which　was　mainly　ascribed　to　the　polarization　effect　of　tourmaline.　The　doping　of　tourmaline　could　improve　the　dispersion　of　catalytic　materials,　reduce　the　band　gap　width,　and　promote　the　activation　of　NH3　and　the　oxidation　of　NO.　Moreover,　the　microscopic　mechanism　was　studied　by　density　functional　theory　(DFT)　calculation　from　the　aspects　of　adsorption　energy,　mulliken　charge　and　density　of　states　during　the　adsorption　process.　Overall,　the　results　of　this　study　will　provide　references　for　the　application　of　mineral　polarization　effect　to　the　field　of　denitration　catalysis　and　promotes　the　further　understanding　of　the　mechanism　for　deNOx　reaction　process.　©　2022