This study investigates the catalytic activity and surface behaviors of V2O5 catalysts modified with promoter components to improve low-temperature activity and suppress SO2-to-SO3 oxidation. Moreover, we fabricated corrugated-type catalysts using glass fiber sheets as substrates, because powdered catalysts revealed limitations for practical applications. The modified catalysts were prepared via a slurry mixing method using vanadium precursor with different promoters such as W, Nb, Zr, Mo, Ce, Fe supported on TiO2. The catalysts were fabricated into slurry coating type catalysts using glass fiber sheets and the catalytic activity, specific surface area, and acid sites were investigated. The performance of corrugated-type catalyst and oxidation of SO2 to SO3 over a wide temperature range were evaluated using a Micro-Reactor. Our results showed that adding a promoter improves the catalytic performance of VW/Ti catalysts by enhancing surface acidity. The results varied depending on the catalyst loading and promoter components over a wide temperature range. Among them, VWNb/Ti catalysts exhibited the highest NOx conversion of 80.9% at 350 °C despite the high gaseous velocity (AV of 51 m·h−1) and the large flow rate of 20 L·min−1, with the lowest Ea of 13.7 kJ·mol−1. Among the evaluated promoters, Nb exhibited the most favorable balance of activity and SO2-to-SO3 oxidation. These results suggest that the Nb modification strategy can be extended to commercial SCR catalysts, providing a practical approach for improving catalytic performance.
Jeong et al. (Tue,) studied this question.