Optimizing the Nh3-Scractivity Of Mn-Based Catalysts Via Sulfuric Acid Concentration-Controlled Treatments

Abstract

Mn-based catalysts exhibit remarkable NH3-SCR activity. However, their single-component oxides are limited by insufficient surface acidity and poor resistance to H2O and SO2. Therefore, enhancing their surface acidity and improving their resistance to water and sulfur is a meaningful research topic. A series of MnCoNi-xS catalysts were fabricated through treatment of MnCoNi (prepared via a solvent-free method) with sulfuric acid at varying concentrations. This study methodically examines how varying concentrations of sulfuric acid affect the SCR activity and H2O and SO2 durability of MnCoNi ternary catalysts. The comprehensive characterization analyses demonstrate that applying varied concentrations of sulfuric acid during treatment can generate differentiated high-activity domains. Appropriate sulfuric acid treatment can enhance the surface acidity, specific surface area, and redox properties of MnCoNi catalysts, thereby promoting their denitrification performance. Ultimately, the MnCoNi-xS catalyst ​maintained exceptional catalytic activity even under prolonged exposure to H₂O and SO₂.

Keywords: Acid treatment, catalyst, MnCoNi-xS, NH3-SCR