Effect of Silica on Nitrate-Incorporated Vanadia Catalysts in Low-Temperature Selective Catalytic Reduction of Nitrogen Oxides

Building on our previous development of highly active nitrate-incorporated V₂O₅–WO₃/TiO₂ powder catalysts, we investigated the effect of SiO₂ as a structural binder for coating these catalysts onto glass fiber sheets.

Coatings with 0–30 wt % SiO₂ were prepared and evaluated. The addition of 10 wt % SiO₂ significantly improved catalyst dispersion, coating uniformity, and mechanical adhesion, successfully preventing the structural degradation typically observed under highly humid operating conditions. Consequently, the SiO₂-containing catalyst demonstrated enhanced physical stability, maintaining consistent NO_<i>x</i> removal efficiencies for at least 80 h, whereas the SiO₂-free coating showed progressive deactivation due to physical peeling.