Low-temperature selective catalytic reduction of NOx with NH3 over an activated carbon-carbon nanotube composite material prepared by in situ method

Ce-supported activated carbon–carbon nanotube composite (Ce/AC-CNTs) catalyst was prepared by in situ 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_x 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.

A Ce-supported activated carbon-carbon nanotube composite (Ce/AC-CNTs) catalyst was prepared by in situ formation of CNTs on AC and then modified by Ce, and was subsequently used for low-temperature selective catalytic reduction of NO_x with NH₃.

Comment on “Non-pitch coal-based activated coke introduced CeOx and/or MnOx for low temperature selective catalytic reduction of NOx by NH3” by Fu et al., RSC Adv., 2016, 6, 8539–8548

I comment on the XPS analysis of these catalysts as a function of MnOx–CeOx content. I argue that it is the total number of oxide sites that enhances the catalysts’ de-nitrification power, and not the MnOx–CeOx interaction, as the authors hold.

Preparation of novel CeMo(x) hollow microspheres for low-temperature SCR removal of NOx with NH3

A series of novel Mo doped CeO₂ hollow microspheres have been successfully synthesized using carbon microspheres as templates, which were characterized by XRD, SEM, TEM, BET and used to remove NO_x upon NH₃-SCR at lower temperature.