Simultaneous Reduction of NO_X and CO Harmful Gases According to the Promoters and Support Types of H₂-SCR Catalyst

The purpose of this study is to simultaneously reduce harmful gases like NO_X and CO according to the promoters and support types of the H₂-SCR. The 0.5Pt-2CeO₂-5Ru/TiO₂ catalyst loaded with 7 wt% Ru showed a lower NO_X conversion rate compared to that of the 0.5Pt-2CeO₂/TiO₂ (STD), but the window shifted to the right, and it showed NO_X reduction performance of up to 30% at 175 °C. When Zr was loaded, de-NO_X performance was not improved at the temperature of 200 °C starting from a low catalyst temperature of 75 °C. With the influence of the support types, the 0.5Pt-2CeO₂/TiO₂ H₂-SCR catalyst showed the highest NO_X conversion rate below 125 °C and the low-temperature activity of NO_X was higher than that of the three Zeolite-loaded H₂-SCR catalysts. Low temperature activity was improved because the TiO₂ has excellent reducing and oxidizing abilities. Among the three Zeolites, the CO reduction performance of the 0.5Pt-2CeO₂/Zeolite (1) catalyst with high Al content was the lowest.