Enhancing Water Tolerance and N Selectivity in NH-SCR Catalysts by Protecting Mn Oxide Nanoparticles in a Silicalite-1 Layer.

Mn-based catalysts are promising candidates for eliminating harmful nitrogen oxides (NO) via selective catalytic reduction with ammonia (NH-SCR) due to their inherent strong redox abilities. However, poor water tolerance and low N selectivity are still the main limitations for practical applications. Herein, we succeeded in preparing an active catalyst for NH-SCR with improved water tolerance and N selectivity based on protecting MnO with a secondary growth of a hydrophobic silicalite-1.

Unraveling the structure and role of Mn and Ce for NOx reduction in application-relevant catalysts.

Mn-based oxides are promising for the selective catalytic reduction (SCR) of NOx with NH at temperatures below 200 °C. There is a general agreement that combining Mn with another metal oxide, such as CeOx improves catalytic activity. However, to date, there is an unsettling debate on the effect of Ce.