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The vanadium oxide/carbon nanotube (VOx/CNTs) composite catalyst was prepared by in-situ growth of VOx nanoparticles on CNTs with a cetylpyridinium chloride (CPC) assisted reflux route. The in-situ prepared catalysts exhibit better NH3-SCR activity in a broader temperature window at low temperature than those prepared by impregnation or a mechanically mixed method. The structural characterizations show that vanadium oxide nanoparticles have a good dispersion on the CNTs surface, with much lower valence vanadium species and chemisorbed oxygen species. The physics-chemistry properties indicate that there is a strong interaction between the VOx and CNTs, and the catalysts present a larger amount of stronger acid. The abovementioned reasons have eventually led to the enhancement of NH3-SCR activity.

In situ supported VOx on carbon nanotubes for the low-temperature selective catalytic reduction of NO with NH3