Abstract
Research was conducted to develop an advanced three-way catalyst with better low-temperature activity and durability than those currently available. Honeycomb monolithic catalysts were designed with different Rh/Pd, Rh/Pd/Pt loading ratios in a double-layer washcoat. A single-cylinder gasoline engine was used to estimate the conversion efficiency of HC and CO. BET, SEM (scanning electron microscopy), and TEM (transmission electron microscope) analysis were performed to confirm the thermal aging process macroscopically. The characteristics of the catalytic reaction were also analyzed by TPR (temperature-programmed reduction) and TPD (temperature-programmed desorption). An Rh/Pd catalyst with a 1/18 loading ratio showed the best conversion efficiency and thermal stability in our study. The light-off temperature for 50% HC conversion of this catalyst was 260°C. The double-layer washcoat enhanced the thermal stability by inhibiting the negative interaction between Pd and Rh during the thermal aging process.
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