Hydrotalcite-derived CuMgFe-LDO catalyst for simultaneous abatement of nitrogen oxides and methanol
The simultaneous abatement of NOx and volatile organic compounds(VOCs)by NH3-SCR catalysts has attracted lots of attention.However,the presence of VOCs can have negative impact on deNOx efficiency especially at low temperatures.In this study,hydrotalcite-derived composite oxide(Cu)MgFe-LDO catalysts were selected to explore the simultaneous removal of NOx and methanol,focusing on the introduction of Cu and the influence of CuOx and FeOx interaction on the synergistic reaction,and the prepared catalysts were characterized and tested.The results showed that the deNOx activity of Cu-containing catalysts was higher than that of MgFe-LDO catalysts,and the optimal catalyst Cu0.5 MgFe-LDO exhibits the best catalytic activity for both NH3-SCR and methanol oxidation in the temperature window of 230-300℃.The appropriate introduction of Cu strengthens the interaction between Cu and Fe species,which is conducive to the redox cycle,resulting in more oxygen defects and reactive oxygen species.Excessive Cu doping will destroy the catalyst structure and reduce the surface acidity.The introduction of Cu can slow down the inhibitory effect of methanol on the SCR reaction.These results can provide useful guidance for the practical application of SCR catalysts for synergistic removal of VOCs.
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