Simple preparation of V2O5-WO3/TiO2/SiC catalytic membrane with highly efficient dust removal and NO reduction

Abstract

Simplifing the preparation process is an efficient method to reduce process energy consumption and product costs. In this work, a one-step vacuum impregnation technology was developed for the preparation of V2O5-WO3/TiO2 catalyst modified SiC (VWTi/SiC) catalytic membranes. In comparison to VWTi/SiC (II) catalytic membrane prepared by the traditional two-step method, the VWTi/SiC (I-X) catalytic membrane prepared via one-step vacuum impregnation technology demonstrate significant advantages in terms of energy saving and consumption reduction. Owing to the strongest activation ability for O2 and NH3 induced by high V4+ species and strong V-W interaction, the optimal VWTi/SiC (I-500) can achieve 90 % ammonia selective catalytic reduction (NH3-SCR) denitrition efficiency at the temperature range from 200 °C to 350 °C, presenting a much higher NH3-SCR activity than VWTi/SiC (II-500). The evaluation of sulfur resistance, long-term stability and dust filtration performance proposed that VWTi/SiC (I-500) demonstrated excellent sulfur resistance and outstanding long-term stability and excellent dust filtration performance (particle interception rate exceeds 99.9 % for typical 2.5 μm silicon dioxide particles) at various condition. Therefore, the VWTi/SiC catalytic membrane prepared by one-step vacuum impregnation method holds great promise and development potential for high-temperature flue gas purification.