Ceria-supported metal catalysts for the selective reduction of NOx

A catalyst fabricated by a method comprising:

• contacting a substrate containing ceria with a first solution containing:
• catalytic cations comprising iron cations;
• and
• at least one chelator;
• and
• contacting the substrate with a second solution containing promoter cations comprising alkali metal cations, alkaline earth metal cations, or a combination thereof,
• wherein surfaces of the catalyst comprise iron cations present having an average loading density less than one iron cation per nm2, and wherein the catalyst catalyzes the specific catalytic reduction of nitric oxide via Reactions I and II:
• 2 NO+2 H2→N2+H2O Reaction I;
• and
• 2NO+3H2→2NH3+O2 Reaction II;
• wherein a combined rate of nitric oxide consumption by Reactions I and II is greater than 20 μmoles of nitric oxide per gram of catalyst per second, at 450° C.