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Biological hydrogen storage and release through multiple cycles of bi-directional hydrogenation of CO2 to formic acid in a single process unit
Joule ( IF 38.6 ) Pub Date : 2022-05-20 , DOI: 10.1016/j.joule.2022.04.020
Fabian M. Schwarz , Jimyung Moon , Florian Oswald , Volker Müller

Hydrogen is a promising fuel in a carbon-neutral economy, and many efforts are currently undertaken to produce hydrogen. One of the challenges is to store and transport the highly explosive gas in a safe and easy way. One option that is intensively analyzed by chemists and biologists is the conversion of hydrogen and CO2 to formic acid, the liquid organic hydrogen carrier. Here, we demonstrate for the first time that a bio-based system, using Acetobacterium woodii as the biocatalyst, allows multiple cycles of bi-directional hydrogenation of CO2 to formic acid in one bioreactor. The process was kept running over 2 weeks producing and oxidizing 330 mM formic acid in total. Unwanted side-product formation of acetic acid was prevented through metabolic engineering of the organism. The demonstrated process design can be considered as a future “bio-battery” for the reversible storage of electrons in the form of H2 in formic acid, a versatile compound.



中文翻译:

通过在单个工艺单元中将二氧化碳双向氢化成甲酸的多个循环进行生物储氢和释放

在碳中和经济中,氢是一种很有前途的燃料,目前正在努力生产氢。挑战之一是以安全和简单的方式储存和运输高爆炸性气体。化学家和生物学家深入分析的一种选择是将氢和 CO 2转化为甲酸,即液态有机氢载体。在这里,我们首次展示了一个以木醋杆菌为生物催化剂的生物基系统,可以实现多个循环的 CO 2双向加氢。在一个生物反应器中生成甲酸。该过程持续运行 2 周以上,总共产生和氧化 330 mM 甲酸。通过生物体的代谢工程防止了乙酸的不需要的副产物形成。所展示的工艺设计可以被视为未来的“生物电池”,用于在甲酸(一种多功能化合物)中以 H 2的形式可逆存储电子。

更新日期:2022-05-20
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