Simultaneous removal of NO and dichloromethane (CHCl) over Nb-loaded cerium nanotubes catalyst.

Herein, a series of niobium oxide supported cerium nanotubes (CeNTs) catalysts with different loading amount of NbO (0-10 wt.%) were prepared and used for selective catalytic reduction of NO with NH (NH-SCR) in the presence of CHCl. Commercial VO-WO-TiO catalyst was also prepared for comparison. The physcial properties and chemical properties of the NbO loaded cerium nanotubes catalysts were investigated by X-ray diffractometer, Transmission electron microscope, Brunauer-Emmett-Teller specific surface area, H-temperature programmed reduction, NH-temperature programmed desorption and X-ray photoelectron spectroscopy. The experiment results showed that the loading amount of NbO had a significant effect on the catalytic performance of the catalysts. 10 wt.% Nb-CeNTs catalyst presented the best NH-SCR performance and degradation efficiency of CHCl among the prepared catalysts, due to its superior redox capability, abundant surface oxygen species and acid sites, the interaction between Nb and Ce, higher ratio of Nb/(Nb+ Nb) and Ce/(Ce + Ce), as well as the special tubular structure of cerium nanotube. This study may provide a practical approach for the design and synthesis of SCR catalysts for the simultaneously removal NO and chlorinated volatile organic compounds (CVOCs) emitted from the stationary industrial sources.