Development of high performance catalytic filter of V^sub 2^O^sub 5^-WO^sub 3^/TiO^sub 2^ supported-SiC for NO^sub x^ reduction

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 1.0 μm) showed the 99.9% NO conversion with the Nx-slip concentration below 15 ppm 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 10 wt% (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 700 ppm NO gas shifted towards the lower one with the increase of the V2O5 content of V2O5-WO3/TiO2 supported SiC filter. M3V3 (3 wt% V2O5) is the best catalyst composition showed 100% NO conversion with the reaction temperature window 280-320 °C with less N2O formation below 20 ppm. However, M3V6 (6 wt% V2O5) showed the lowest reaction temperature as 240 °C for >99% NO conversion.