Carbon nanotubes loaded with vanadium oxide for reduction NO with NH3 at low temperature

The catalytic activity of carbon nanotubes-supported vanadium oxide (V2O5/CNTs) catalysts in the selective catalytic reduction (SCR) of NO with NH3 at low temperatures (≤ 250 °C) was investigated. The effects of V2O5 loading, reaction temperature, and presence of SO2 on the SCR activity were evaluated. The results show that V2O5/CNTs catalysts exhibit high activity for NO reduction with NH3 at low-temperatures. The catalysts also show very high stability in the presence of SO2. More interestingly, their activities are significantly promoted instead of being poisoned by SO2. The promoting effect of SO2 is distinctly associated with V2O5 loading, particularly maximized at low V2O5 loading, which indicated the role of CNTs support in this effect. The promoting effect of SO2 at low temperatures suggests that V2O5/CNTs catalysts are promising catalytic materials for low-temperature SCR reactions.

Graphical AbstractThe V2O5/CNTs catalysts with low V2O5 loading show excellent catalytic activity and the presence of SO2 has a promoting effect on its activity at low temperature. The effect of SO2, increasing catalytic activity, is due to sulfate that is formed during reaction process. This sulfate easily decomposed on the catalyst surface at low temperatures and does not block the pores of the catalyst. The V2O5/CNTs catalyst shows high SO2 adsorption activity than that of V2O5 and CNTs. This reason may be attributed to a synergistic interaction between carbon and V2O5.Figure optionsDownload as PowerPoint slide