Promotional effect of CeOX for NO reduction over V2O5/TiO2-carbon nanotube composites

A series of V2O5–CeOX/TiO2-carbon nanotube composites were prepared by sol–gel method and their catalytic activity for the reduction of NOX with NH3 was compared. V2O5CeOX/TiO2 (Ce/V = 9) achieved a NOX removal efficiency of 92% and 98% at 200 °C and 250 °C, respectively. SEM, XRD, XPS, BET, Raman, TPD and TPR were employed to probe the promotional effect of CeOX. The appearance of Ce3+ is found to increase chemisorbed oxygen thus facilitates the catalytic reduction of NOX. The poisoning effect caused by SO2 was found to depend on temperatures and gas velocity strongly. Moreover, the existence of excess oxygen was found to be essential (2% of O2 compared to 500 ppm NOX) to keep high SCR activity.

The NOX removal efficiency and reaction rate coefficient increased upon introduction of CeOX into catalyst V2O5/TiO2-CNTs.Figure optionsDownload high-quality image (82 K)Download as PowerPoint slideHighlights
► A series of V2O5–CeOX/TiO2-CNTs catalysts were synthesized by sol–gel.
► A catalytic promotional effect was observed by adding CeOX into V2O5/TiO2-CNTs.
► The reducibility, acidity, chemisorbed oxygen increased with introduction of CeOX.