DE-NOx/CO Performance According to Ag Loading Amount and Support Type of H2-SCR

This study aims to investigate the NOx/CO reduction characteristics of harmful gases according to the loading amount of active Ag, which plays the most important role in H₂-SCR, and the type of support. H₂-SCR with Ag loaded on support of TiO₂ was reduced to Ag⁺ at about 140 °C in AgO oxide, and H₂-SCR with Ag loaded on support of Al₂O₃ was reduced to Ag clusters (Ag_n^δ+) at about 260 °C in AgO oxide. Because it is more unstable than AgO oxide, it promoted the chemical reaction of Ag. 0.5Ag/TiO₂ H₂-SCR showed the highest NOx conversion rate of about 18% at 200 °C, and the window width was also widened. 2Ag/Al₂O₃ H₂-SCR improved the low-temperature activity of the catalyst due to its large specific surface area and the loading amount of active catalyst Ag. Although the harmful gas reduction performance has decreased significantly compared to the active material Pt used in the H₂-SCR, research on active materials considering the performance the improvement and economic feasibility must be continued.