Low-Temperature Selective Catalytic Reduction of NO(x) with NH(3) over Mn–Ce Composites Synthesized by Polymer-Assisted Deposition

[Image: see text] The Mn(x)Ce(y) binary catalysts with a three-dimensional network structure were successfully prepared via a polymer-assisted deposition method using ethylenediaminetetraacetic acid and polyethyleneimine as complexing agents. The developed pore structure could facilitate the gas diffusion and accelerate the catalytic reaction for NH(3) selective catalytic reduction (SCR). Moreover, the addition of Ce is beneficial for the exposure of active sites on the catalyst surface and increases the adsorption of the NH(3) and NO species. Therefore, the Mn(1)Ce(1) catalyst exhibits the best catalytic activity for NO(x) removal with a conversion rate of 97% at 180 °C, superior water resistance, and favorable stability. The SCR reaction over the Mn(1)Ce(1) catalyst takes place through the E–R pathway, which is confirmed by the in situ diffuse reflectance Fourier transform analysis. This work explores a new strategy to fabricate multimetal catalysts and optimize the structure of catalysts.