Enhancing the Precipitant and Calcination Process of Manganese-Iron Oxide Catalyst for Low-Temperature NH3-SCR

Abstract

Catalysts containing manganese as the primary active component have emerged as promising candidates for ultra-low temperature NH3-SCR applications. To enhance the catalytic activity of these catalysts, a series of Mn-FeOX catalysts were prepared using the co-precipitation method. This study focuses on investigating the appropriate calcination process for catalyst preparation using different precipitants, namely NaOH, NH3-H2O and Na2CO3. The results revealed that catalysts prepared with Na2CO3 as the preferred precipitant and calcined at 330∘C exhibited exceptional NOx removal efficiency, exceeding 90% at a temperature of 60∘C and GHSV [Formula: see text] 30,000[Formula: see text]h[Formula: see text], which demonstrated this catalyst’s remarkable low-temperature reduction capability. Detailed characterization demonstrated that the MnOX catalysts synthesized through this process possessed an amorphous structure, superior pore structure and the highest Fe[Formula: see text] content. These findings offer valuable insights for optimizing the preparation conditions of Mn-FeOX catalysts in ultra-low temperature denitrification applications.