Abstract
AbstractThis study investigated the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with hydrocarbon in the presence of excess oxygen using various composition ratios of Pt/Al2O3, Rh/Al2O3 catalyst mixtures. The composition ratios were 1:1, 1:2, 2:1, 1:3 and 3:1 of 1 wt% Pt/Al2O3 and Rh/Al2O3, which are known to exhibit efficient NOx reduction at low and high temperatures among the noble metal catalysts. Experiments conducted on a single reductant revealed that more efficient NOx conversion could be obtained when Pt/Al2O3 and Rh/Al2O3 were mixed at a ratio of 3:1, rather than 1:1 or 1:3. In a single reductant condition, C3H6 800 ppm (2400 ppmC1) and 400 ppm (1200 ppmC1) exhibited 50% and 38% NOx conversion efficiency at 200°C, respectively. However, NOx conversion efficiency gradually decreased when temperatures were increased above 250°C. With regard to Pt/Al2O3 and Rh/Al2O3 ratio, higher ratios of Rh/Al2O3 activated this Pt+Rh/Al2O3 catalyst in the high temperature range.
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