碳捕集與利用(英語:Carbon Capture and Utilization,簡稱CCU)是捕集二氧化碳以供進一步使用的過程[1]。碳捕集與利用可以應對全球挑戰,即顯著減少主要固定工業排放者的溫室氣體排放[2]。CCU不同於碳捕集與封存(CCS),因為CCU既不旨在也不導致二氧化碳的永久地質儲存。相反,CCU旨在將捕集的二氧化碳轉化為更有價值的物質或產品;例如塑料、混凝土或生物燃料等;同時保持生產過程的碳中和。捕集的二氧化碳可以轉化為多種產品:一類是醇類(例如甲醇),可用作生物燃料和其他替代能源和可再生能源,或用於各種化學合成的反應物[3]。儘管CCU不會對大氣產生淨碳正效應,但有幾個重要的考慮因素需要考慮。因為二氧化碳是一種熱力學穩定的碳製造產品,它是能源密集型產品[4]。在投資CCU之前,還應考慮用於製造產品的其他原材料的可用性。考慮到捕集與利用的不同潛在選擇,研究表明,涉及化學品、燃料和微藻類的方法去除二氧化碳的潛力有限,而涉及建築材料和農業用途的方法可能更有效[5]。CCU的盈利能力部分取決於釋放到大氣中的二氧化碳的碳定價。
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