Selective Catalytic Reduction Activity of MnO_x/TiO₂ Catalyst Under Impact of Mineral Polarization

The low denitration activity and stability of MnO_x/TiO₂ catalyst are still challenging. In this work, a MnO_x/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.