Carbon nanotubes loaded with vanadium oxide for reduction NO with NH sub(3) at low temperature

The catalytic activity of carbon nanotubes-supported vanadium oxide (V sub(2)O sub(5)/CNTs) catalysts in the selective catalytic reduction (SCR) of NO with NH sub(3) at low temperatures ([< or =]250 [degrees]C) was investigated. The effects of V sub(2)O sub(5) loading, reaction temperature, and presence of SO sub(2) on the SCR activity were evaluated. The results show that V sub(2)O sub(5)/CNTs catalysts exhibit high activity for NO reduction with NH sub(3) at low-temperatures. The catalysts also show very high stability in the presence of SO sub(2). More interestingly, their activities are significantly promoted instead of being poisoned by SO sub(2). The promoting effect of SO sub(2) is distinctly associated with V sub(2)O sub(5) loading, particularly maximized at low V sub(2)O sub(5) loading, which indicated the role of CNTs support in this effect The promoting effect of SO sub(2) at low temperatures suggests that V sub(2)O sub(5)/CNTs catalysts are promising catalytic materials for low-temperature SCR reactions.