Low-Temperature NH3 Selective Catalytic Reduction Performance Enhancement of Fe-Based Oxides by Employing Carbon Nanotubes to Decorate the MgFe-LDH

摘要

In this study, a series of Mg3Fe1-layered double oxide/xcarbon nanotubes (Mg3Fe1-LDO/xCNTs) catalysts were constructed from the topological shift of Mg3Fe1-layered double hydroxide (Mg3Fe1-LDH) precursor. The as-prepared catalysts were innova-tively evaluated as potential candidates for low temperature selective catalytic reduction of NO with NH3 (NH3-SCR). It was found that Mg3Fe1/10CNTs catalyst exhibited superb NH3-SCR activity, with NOx conversion exceeding 80% at low temperatures (180-270°C). Moreover, excellent durability and stability towards SO2 was obtained. Such high catalytic efficiency can be attributed to the proper surface acidity and redox capacity of the catalyst, which might be correlated with higher dispersion and more appropriate valence distribution of Fe species caused by the moderate CNTs doping content. This work provides a fundamental understanding on Fe~(3+)/Fe~(2+) synergistic effect of NH3-SCR, which is propitious for the rational design and optimization of Fe-based oxide low-temperature denitrification (de-NOx) catalysts.