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酶-电耦合催化固定二氧化碳生产l-乳酸的研究
首发时间：2024-06-06
摘要：l-乳酸是12种基本平台化学品之一，其市场价值极高。以二氧化碳为原料生产l-乳酸，可为推进双碳战略提供新的解决思路。因此本研究通过电催化还原体系将二氧化碳转化为乙醇，并耦合酶催化体系进一步将乙醇转化为l-乳酸。由此构建了以二氧化碳为底物生产l-乳酸的酶电耦合系统，其l-乳酸产量为1.41 mm。进一步探索了酶催化体系的反应条件，寻找到最适的ph值、酶浓度及乙醇浓度。还通过耦合电催化辅因子再生系统，增加了酶催化体系内的nadh浓度，提高了酶催化效率。此外，引入离子液体改善了酶催化反应介质，通过提高体系内的二氧化碳溶解度从而提升了系统的l-乳酸产量。提高了l-乳酸产量。最终获得了一套高效的酶电耦合系统，其l-乳酸产量为4.14 mm，是初始产量的3倍。
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production of l-lactate with carbon dioxide fixation by using an enzyme-electrical coupling system
abstract：l-lactic acid is one of the 12 basic platform chemicals with significant value.the production of l-lactic acid using carbon dioxide as a raw material can provide a new solution for advancing the development of the carbon peaking and carbon neutrality strategy.therefore, in this study, carbon dioxide was converted to ethanol by electrocatalytic reduction system, and ethanol was further converted to l-lactic acid by coupled enzyme-catalyzed system.the constructed enzyme-electrically coupled system produced 1.41 mm of l-lactic acid using carbon dioxide as substrate.the reaction conditions of the enzyme-catalyzed system were further explored to find the optimum ph, enzyme concentration and ethanol concentration.the nadh concentration within the enzyme-catalyzed system was also increased by coupling an electrocatalytic cofactor regeneration system to improve the enzyme-catalyzed efficiency. moreover, the reaction medium of the enzyme-catalyzed reaction was improved by using ionic liquids to increase the carbon dioxide concentration in the system and thus enhance the l-lactic acid production.finally, an efficient enzyme-electrocoupling system was obtained with an l-lactic acid yield of 4.14 mm, which was three times of the initial yield.
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酶-电耦合催化固定二氧化碳生产l-乳酸的研究
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