| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 96 === On-board generation of hydrogen by methanol steam reforming is being used in the development of fuel-cell engines for various transportation applications. In the past the reaction was studied over CuO/ZnO/Al2O3-based catalyst. Previous studies have reported that CeO2 and ZrO2 both enhanced the reducibility of CuO, the Cu dispersion and the amount of Cu+, and those causes have been cited as a possible reason for the activity and stability promotion of catalyst. Although the advantages of CeO2 and ZrO2 have gone into details, their catalyst composition is limited.
Our researchers varied commercial catalyst G66B composition (CuO/ZnO/Al2O3 = 30/60/10), and introduced CeO2 and ZrO2 simultaneously. In the methanol steam reforming, CeO2 inhibited the activity of catalyst because of the movement of Al atom. ZrO2 certainly enhanced the performance of catalysts, and 10~20 wt% ZrO2 was most effective for catalyst. Al2O3 which played the role of texture promoter inhibited the activity of catalyst seriously, need adding moderately. Varying the ratio of Cu/Zn, CuO/ZnO/Al2O3 (50/40/10) and CuO/ZnO/Al2O3 (40/50/10) showed better activity, but their stability was bad. In order to enhance the performance of catalyst, we introduced 10~20 wt% ZrO2, and produced the best catalyst CuO/ZnO/ZrO2/Al2O3 (40/30/20/10).
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