| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 96 === In the thesis, the purpose of this study is to prepare nanocatalyst Cu/CeO2 supported on carbon nanotubes (CNTs) and to apply it on steam reforming of methanol. The parameters catalyst preparation include the different Cu/CeO2 deposition method, types of support of catalyst, weight ratio of Cu/ CeO2, Cu/ CeO2 content, different second promoters, weight ratio of CeO2/ZnO and additions of different metals . Operating conditions in steam reforming of methanol are molar ratio of H2O/CH3OH, weight hourly space velocity, and stability of catalysts.
The results show that the catalyst prepared by precipitation and reduction method has a higher activity than co-precipitation method. The highest hydrogen yield with carbon nanotubes(40~60 nm) as support for catalysts was obtained. A high hydrogen yield and selectivity of CO2 were achieved at weight ratio of Cu to CeO2 being 1：1. The catalyst with 50 wt% Cu/ CeO2/CNTs showed high activities at 320 ℃, and by adding ZnO as second promoter to Cu/ CeO2/CNTs catalyst, the hydrogen yield was obtained near 100 % at 280 ℃. The addition of second active metal (Pt、Fe and Pd) reduces the catalytic activity.
In methanol steam reforming with 1.3 of molar ratio of water to methanol, the hydrogen yield was 98 % and hydrogen production rate was 117.05 mmol/s*kg.cat at 280 ℃. In 100-hour duration of test, after 34 hr, the hydrogen production rate kept at 84 mmol/s*kg.cat.
In this study, we successfully prepared Cu/ CeO2 catalyst supported on carbon nanotubes with precipitation and reduction method, and applied it in steam reforming of methanol efficiently.
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