The Effect of Tourmaline on SCR Denitrification Activity of MnOx/TiO2 at Low Temperature

Abstract

Selective catalytic reduction (SCR) technology is the most widely used flue gas denitration technology at present. The stability of a catalyst is the main factor limiting the development of this technology. In this study, an environmentally friendly and highly efficient NH3-SCR catalyst was prepared by coprecipitation method from acidolysis residue of industrial waste and tourmaline. We found that the addition of tourmaline has an important impact on the denitration activity of the catalytic material. The NOx conversion exceeded 97% at 200 °C with the dosage of 10% tourmaline, which is about 7% higher than that without doping. The improvement of catalytic performance was mostly attributed to the permanent electrodes of tourmaline, which effectively promotes the dispersion of MnOx/TiO2 catalytic materials, increases the number of acidic sites and changes the valence distribution of manganese ions in products, which speeds up the diffusion of protons and ions, resulting in the acceleration of redox reaction. These as-developed tourmaline-modified MnOx/TiO2 materials have been demonstrated to be promising as a new type of highly efficient low-temperature NH3-SCR catalyst.

Preparation and Performance of a Novel ZnO/TM/PET Composite Negative Ion Functional Fiber

“…The rheological properties of the ZnO/TM/PET composite and the morphology, mechanical properties, thermal properties, and anion release properties of the ZnO/TM/PET fiber were studied to provide theoretical Tourmaline is a common additive for the development of negative ion functional fibers. Its special crystal structure causes it to produce piezoelectric and pyroelectric effects under the external temperature, pressure change, or spontaneous polarization effect, so that its surface generates charges and then ionizes air molecules to form negative ions [15][16][17][18]. In recent years, scholars have conducted a series of studies on the factors affecting the negative ion emission efficiency of tourmaline, mainly through doping modified tourmaline [19][20][21] and small particle size tourmaline [22][23][24] to obtain much higher negative ion release.…”