Triple-shelled NiMn2O4 hollow spheres as an efficient catalyst for low-temperature selective catalytic reduction of NOx with NH3.

Unique triple-shelled NiMn2O4 hollow spheres are fabricated by a facile solvothermal method. Owing to its particular triple shell structure, the as prepared NiMn2O4 catalyst exhibits superior low-temperature NH3-SCR catalytic performance, achieving above 90% NOx conversion in the temperature range from 100 °C to 225 °C.