| Summary: | 碩士 === 元培醫事科技大學 === 環境工程衛生系碩士班 === 106 === Motorcycle exhaust emissions contain hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx), and such emissions can be reduced with the use of catalysts. According to the Vehicular Air Pollutant Emission Standards (Phase 6) in 2017, the effective period of any new car’s original emission control system is extended from three years stipulated in Phase 5 to five years in Phase 6, and the guaranteed mileage is increased from 15,000 km to 20,000 km and 35,000 km; accordingly, the durability of the catalyst must also be improved. In this study, we investigated the efficiency and thermal stability of motorcycleexhaust treatment by means of Perovskite-type honeycomb catalyst.
In this study, Ce and La metal changes were used to explore the impact of A site composition of Perovskite-type catalyst on the efficiency. The result showed that the removal efficiency and anti-thermal degradation of CeMnFePdO3 catalyst on pollutants were better than that of LaMnFePdO3 catalyst. Based on Perovskite catalyst with Ce in the A site composition, we studied the effect of composition change in the B site catalyst on the efficiency. The result showed that the efficiency of CO and NO removal was arranged in the following order of priority: CeMnFePd>CeCoZrPd>CeBaMnCuPd>CeFePdRh >CeMnCoPd.
Then the CeMnFePdO3 catalyst with the best efficiency was used to investigate the effect of adding Zeolite or Al2O3. The result showed that the addition of Zeolite in fresh catalyst promoted the efficiency of HC and CO removal, but the catalyst stability was better when nothing was added to it after thermal degradation. It also showed that, under the conditions of simulated automotive exhaust, Perovskite catalyst performed better in the treatment efficiency than traditional catalyst.
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