二氧化碳是一種溫室氣體，隨著人類經濟發展，大氣中二氧化碳濃度逐年增加，造成許多氣候異常現象，例如：溫室效應、海平面上升等。二氧化碳減量技術中，二氧化碳轉換技術被認為是具有潛力的方法，特別是透過環加成反應將二氧化碳轉換成高經濟價值的環狀碳酸酯。近年來，有許多觸媒已被製備用於環加成反應，但是這一系列的觸媒面臨許多問題，例如：長反應時間，高溫、高壓，有毒助溶劑，金屬浸出等，因此，開發具綠色化學條件的觸媒極為重要。本研究利用楓香果實以熱解法製備LfH-X (X= 600, 700, 800, 900, 1000℃)及以碘化鉀水溶液混合楓香果實粉後以熱解法製備YMI-L9 (Y= 4, 8, 12M)的生物碳，合成之生物碳透過SEM、XPS、XRD、FTIR、EA、STA、XRF及比表面積分析儀等進行特性分析，並且應用於二氧化碳環加成反應形成碳酸丙烯酯，再以GC-BID分析及計算其轉換率和選擇性，並計算出產率。結果顯示，於反應條件為環氧丙烷量43 mmole，觸媒量0.1600 g，四甲基碘化銨量0.86 mmole，溫度90°C，CO2壓力(3 kg/cm2)下，反應時間3小時，LfH-900有最好的環氧丙烷轉換率及碳酸丙烯酯的產率(皆為90%)，歸因於LfH-900具有較高的催化性能（即比表面積和CO2吸收量），並且表面富有羥基和羧基可以活化環氧化物的C-O鍵幫助其開環。在摻雜碘生物碳方面，8MI-L9在上述相同的反應條件下，環氧丙烷的轉換率及碳酸丙烯酯產率分別為97%及87%，主要由於表面具有高氫鍵供給基團和三碘化物陰離子，其中三碘化物陰離子可以攻擊環氧化物被極化的C-O鍵以利開環。

With the development of human activity, the CO2 concentration in the atmosphere increases year by year, resulting in a number of climate anomalies, for example: greenhouse effect and sea level rise, etc. Among the carbon dioxide reduction technologies, carbon dioxide conversion technology is considered to be a potential method, especially for converting carbon dioxide into high value of cyclic carbonates through cycloaddition reactions. Recently, plenty of catalysts have been prepared for cycloaddition reactions. However, the reported catalysts faced some problems, such as long reaction time, high temperature, high pressure, toxic co-solvent and metal leaching, etc. Therefore, it is important to develop the catalysts with green and environmental-friendly process. In this study, the fruits of Liquidambar formosana Hance were used to prepare the LfH-X (X= 600, 700, 800, 900, 1000℃) and idione-doped biochars (i.e., YMI-L9, Y= 4, 8, 12M) by a simple pyrolysis method. The synthesized biochars were analyzed by SEM, XPS, XRD, FTIR, EA, STA, XRF, N2 adsorption-desorption measurement, and CO2 adsorption measurement. The obtained LfH-X (X= 600, 700, 800, 900, 1000℃) and YMI-L9 (Y= 4, 8, 12M) were applied in the cycloaddition reaction to form propylene carbonate, and then analyzed by GC-BID and then calculated the conversion and selectivity. Among LfH-X catalysts, LfH-900 has the highest PO conversion and PC yield of 90% under the conditions of PO (43 mmole), catalyst (0.1600 g), TBAI (0.86 mmole), reaction temperature (90℃), pressure (3 kg/cm2) and reaction time (3 h). This is due to the fact that the LfH-900 exhibits specific surface area and CO2 absorption capacity, and abundant hydroxyl and carboxyl groups on the surface which can activate the C-O bond of the epoxide to facilitate the ring opening. In terms of YMI-L9, the 8MI-L9 has PO conversion and PC yield by were about 97% and 87%, respectively under the same reaction conditions mentioned above, which is possibly attributed to the presence of high hydrogen bond donor groups and triiodide anion that can attack the polarized carbon-oxygen bond of the epoxide to boost ring opening.

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