Structure-Sensitive Behavior of Supported Vanadia-Based Catalysts for Combustion of Soot

Catalytic performance of 3 and 5 wt.% of vanadia, supported on zirconia, zirconia-ceria, and zirconia-yttria, tested in the combustion of soot without and in the presence of NO was described. The catalysts were characterized by structural (XRD, RS) and functional (EPR, TPR) methods. The effect of composition on the catalytic performance of the investigated systems in soot combustion was discussed in detail. Zirconia-supported vanadia was found to be the most active catalyst for soot oxidation characterized by the lowest combustion temperature (similar to 375 degrees C) attributed to the maximal signal of conversion to the detected products. The relationship between the reducibility of surface oxovanadium species and their catalytic activity was established, revealing the involvement of the lattice oxygen in the combustion process. The importance of thermal treatment conditions and the nature of zirconia-based support determining the stability of specific oxovanadium entities on the catalyst surface was emphasized.

Automated summary

The catalytic performance of vanadia supported on different zirconia-based materials in the combustion of soot was studied. The results showed that zirconia-supported vanadia exhibited the highest activity, with the lowest combustion temperature. The reducibility of surface oxovanadium species was found to be closely related to their catalytic activity, and the thermal treatment conditions and the nature of the zirconia-based support were important for the stability of specific oxovanadium entities on the catalyst surface.