Development of high performance catalytic filter of V2O5-WO3/TiO2 supported-SiC for NOx reduction

Abstract

Fabrication of V2O5-WO3/TiO2 supported-SiC catalytic filters has been developed by using rotational coating method and discussed their NO conversion performances at different reaction temperature (150–380°C). M3C catalytic filter (coated with the grinded catalyst solution of catalyst with particle size of 1.0μm) showed the 99.9% NO conversion with the Nx-slip concentration below 15ppm with the optimal temperature range from 230–350°C, which is very satisfactory with the value approaching to the case of powder catalyst. The concentration of the catalyst coating solution optimized to 10wt% (M310) to achieve the better NO conversion >99.5%. An effect of ball milling on the catalytic coating solution has investigated to achieve the 99.9% NO conversion. The effect of varied V2O5 content on NO conversion has been studied. The activation temperature for >99% conversion of 700ppm NO gas shifted towards the lower one with the increase of the V2O5 content of V2O5-WO3/TiO2 supported SiC filter. M3V3 (3wt% V2O5) is the best catalyst composition showed 100% NO conversion with the reaction temperature window 280–320°C with less N2O formation below 20ppm. However, M3V6 (6wt% V2O5) showed the lowest reaction temperature as 240°C for >99% NO conversion.