Mechanism of selective catalytic reduction of NO with NH3 over coal-based activated coke: The effects of surface chemical properties

In order to elucidate the mechanism of selective catalytic reduction of NO with NH₃ over activated coke and clarity of the effects of its surface chemical of activated coke. Five commercial coal-based activated cokes for NO reduction with NH₃ were examined in a fixed-bed quartz micro reactor at 150 °C. X-ray photoelectron spectroscopy (XPS) and acid-base titration were used to characterize the surface chemical properties of the samples. The results showed that the NO conversion over the activated cokes has been increased with the amounts of surface acidic sites and oxygen content. A correlation between catalytic activity and NH₃ adsorption capacity could be observed. The adsorption of NH₃ on the acidic sites of the activated coke seemed to play an important role in catalytic selective reduction of NO with NH₃.