Treating motorcycle exhaust by ferrite catalysts

• Main Authors: Chih-I Wu, 吳致易
• Other Authors: Chien-Kuei Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/99265053241385561720

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 102 === The spinel-structured ferrites have the potential in substitution for noble metal catalysts due to their great catalytic ability, stability, and the low cost. To estimate the catalytic feasibility for the treatment of motorcycle exhaust, this study synthesized seven ferrite catalysts (Fe3O4, Cu-ferrite, Mn-ferrite, Cr-ferrite, Co-ferrite, Ni-ferrite, and Zn-ferrite) by using ferrite process (FP), and tested their catalytic efficiencies of hydrocarbon (HC) and carbon monoxide (CO). The results showed that Cu-ferrite with the molar ratio of Cu/Fe 1/2.5 owned the best catalytic efficiency in conversion of HC and CO. The proposed Cu-ferrite could reduce HC to meet the standard limit and significantly inhibit CO within 300˚C under the conditions of oxygen content (0.5~18%), space velocities (3000~24000 hr-1) and exhaust concentrations (1000~4000 ppm). Additionally, the durability investigation indicated that Cu-ferrites still keep their catalytic activity even after the temperature changes of 30 repetitions. X-ray diffraction analysis revealed that the catalysts are spinel-structured even after the catalytic incineration, implying that the reaction would not change their crystalline structure.