Chemical deactivation and resistance of Mn-based SCR catalysts for NOx removal from stationary sources

CO + NH3 coupling denitration at low temperatures over manganese/activated carbon catalysts

“…The denitration rate order remained 7Mn/AC > 9Mn/AC > 5Mn/AC catalyst. For the NH 3 -SCR reaction in the low-temperature stage, the adsorption capacity of AC was limited due to the limited metal loading capacity of the catalyst; 19 therefore, as NO gas increases, the denitration rate continues to decline. For the CO-SCR reaction, CO is adsorbed to form coordinated carbonate, and NO is adsorbed to form coordinated nitro; then, carbonate and nitro will react to generate CO and N 2 O.…”

Minireview and Perspective of One-Dimensional Manganese Oxide Nanostructures for the Removal of Air Pollutants

“…As the kernel factor of the catalytic process, the selection of a catalyst is directly linked to the efficiency of removing air pollutants . Manganese oxide-based catalysts have been comprehensively used for their superior oxidation ability and environment-friendly property.…”

Revealing the crystal facet effect on N2O formation during the NH3-SCR over α-MnO2 catalysts

“…23 Among various catalysts, manganese-based catalysts have been widely studied and applied due to their low cost and outstanding low-temperature denitrication performance, whereby their abundant Lewis acid sites, variable valence states of Mn, and strong redox ability contribute to their excellent catalytic activity at low temperature, especially under 200 °C. 10,[24][25][26][27] For instance, Yang et al 28 found that a-MnO 2 exhibited the most superior SCR performance for NO x conversion compared with other crystal phases of b, g, and d-MnO 2 at a lower temperature of 50-120 °C. However, the low N 2 selectivity currently extremely restricts the application of Mn-based catalysts because the strong oxidation ability of tetravalent Mn leads to more N 2 O formation.…”