%0 Journal Article
%T Low-temperature Reduction of NOx by NH3 with Unity Conversion on Nanofilament MnO2/Activated Semi-Coke Catalyst.
%A He B
%A Li H
%A Liang S
%A Wang X
%A Wang H
%A Wang Y
%J Chemistry
%V 0
%N 0
%D 2024 Aug 7
%M 39109481
%F 5.02
%R 10.1002/chem.202401803
%X Selective catalytic reduction of nitrogen oxides with NH3 at low temperatures remains a key goal for industrial applications. However, effective catalysts operating at 90 oC are rarely reported, limiting SCR scenarios to high-temperature conditions. Herein, we report a unique MnO2 nanofilament catalyst grown on activated semi-coke synthesized via a one-step in situ hydrothermal approach, which exhibits a stable and marked 100% conversion rate of NO to N2 with 100% selectivity at 90 oC, superior to the other prepared structures (nanowires, nanorods, and nanotubes). Temperature-programmed desorption shows a large number of acid sites on MnO2(NFs)/ASC, benefiting the formation of NH4+ ions. Meanwhile, diffuse reflectance infrared Fourier transform spectroscopy reveals the activation of NO with O2 to form bidentate nitrate/bridging nitrate NO2 intermediates via bidentate nitrate species, triggering the Fast SCR with NH3 at low temperatures. Such an effective, easy-to-prepare, and low-cost catalyst paves a new pathway for low-temperature SCR for a wide range of application scenarios.