The　low　denitration　activity　and　stability　of　MnOx/TiO2　catalyst　are　still　challenging.　In　this　work,　a　MnOx/TiO2　catalyst　was　modified　via　a　polarization　effect　with　tourmaline.　Tourmaline　with　a　proper　fineness　can　improve　the　denitration　performance　of　the　catalytic　material,　obtaining　the　greater　denitration　rate　above　90%　in　a　wide　temperature　range　and　the　prolonged　high-efficiency　denitration　time.　Based　on　the　results　of　in-situ　Fourier　transform　infrared　spectroscopy,　the　reaction　mechanism　of　the　catalysts　before　and　after　modification　with　tourmaline　follows　the　Langmuir-Hinshelwood　mechanism,　and　tourmaline　polarization　can　accelerate　the　adsorption　rate　of　reaction　gas　and　generate　intermediate　products　liable　for　subsequent　reaction,　thus　improving　the　denitration　performance.　©　2023,　Editorial　Department　of　Journal　of　the　Chinese　Ceramic　Society.　All　right　reserved.