Low-temperature selective catalytic reduction of NO_x with NH₃ over an activated carbon-carbon nanotube composite material prepared by <i>in situ</i> method

Abstract

Ce-supported activated carbon-carbon nanotube composite (Ce/AC-CNTs) catalyst was prepared by <i>in situ</i> formation of CNTs on AC and then modified by Ce. This Ce/AC-CNTs catalyst was subsequently used for low-temperature selective catalytic reduction of NO _<i>x</i> with NH₃ (NH₃-SCR). The NO conversion of Ce/AC-CNTs was 1.41 times higher than that of Ce/AC at 150 °C with good SO₂ tolerance. The catalysts were analyzed by N₂ physisorption, SEM, XRD, NH₃-TPD, XPS, and Raman technologies. The results showed that the introduction of CNTs could form new mesopores and increase the amount of surface chemisorbed oxygen and acid sites, which all contribute to the high NH₃-SCR activity.