| Summary: | 碩士 === 國立中興大學 === 環境工程學系所 === 106 === Due to the excessive exploitation of natural resources and the overload of the environment, the concept of circular economy has begun one of the most intriguing and hot topic in recent years. As valorization of biomass-derived compounds to value-added products constitutes an essential step towards sustainable development of nature resources, catalytic transfer hydrogenation (CTH) of levulinic acid (LA) to a versatile platform chemical, γ-valerolactone (GVL), has received increasing attention in some published studies owing to CTH can be implemented using alcohols as solvent and as H-donors simultaneously, with the use of non-noble metal catalysts.
While conventional heating (HT) is commonly used for LA conversion via CTH, microwave irradiation (MWI) is employed in this study for converting LA via CTH using UiO-66 as a non-noble metal catalyst. Compared to conventional heating, MWI significantly accelerates and enhances LA conversion to GVL as the corresponding percentages of yields and selectivities preforms much higher than those obtained by conventional heating. This enhancement may be because Zr-O clusters of UiO-66 are more catalytic active owing to the quick and intensive heat which promotes the effects from the ligand of UiO-66 under MWI. Additionally, MWI is still able to enhance LA conversion substantially in less suitable alcohols for LA conversion and also enables the unfavorable UiO-66-NH2 to work and making the effective catalyst, UiO-66-SO3H, even more catalytically active. The enhancement caused by the MWI could be repeated over multiple cycles and the catalytic activity of UiO-66 is quite stable. These features indicated that MWI is certainly a useful and effective approach for enhancing LA conversion via CTH.
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