Establishing a sustainable methanogenic carbon dioxide reduction in bioelectrochemical systems and identification of kinetic and thermodynamic constraints.

在生物电化学系统中建立可持续的产甲烷二氧化碳还原并确定动力学和热力学约束。

基本信息

项目摘要

Bioelectrochemical systems allow for the storage of electric energy in form of methane (CH4), which is a transportable gas that can be benefit from pre-existent natural gas infrastructure. In these biological reactors, a cathode provides electrons for the carbon dioxide (CO2) reduction into methane (CH4) through an anaerobic microbiome. The objectives of this proposal can be divided in two lines: i) development and investigation of Fe4.5Ni4.5S8 electrodes, which mimic the catalytic properties of important enzymes of the methanogenic processes; and ii) use of carbon isotope analysis to support a comprehensive process analysis and simulation of the CH4 formation from CO2 in bioreactors. The hypothesis for the studies on the kinetic isotope effects is that in the CH4 formation using direct electron transfer pathways the 13C fractionation is dependent on the available free energy for the methanogenic metabolism, analogously to the hydrogenotrophic methanogenesis. For instance, a variable 13C fractionation is observed in autotrophic CO2-fixation processes through bacteria, archaea and algae. Hence, if we confirm this hypothesis we can develop a model framework using 13C analysis data for detailed description of product formation yields with thermodynamic dependent growth kinetics and detailed calculation of the stable carbon isotope fractionation. This model should be valid for the methanogenic CO2 reduction route using different electron donors. Therefore, gas diffusion cathodes will be applied to allow for an immediate change in the electron donor source, i.e. gassing of hydrogen (H2) or providing an electric current. Ultimately, through the 13C-based thermodynamic diagnosis, ideal conditions for comparing the novel Fe4.5Ni4.5S8 against benchmark electrodes will be provided. We expect that the hydrogenase and CO-dehydrogenase functional mimics from the Fe4.5Ni4.5S8 electrodes can enhance the methanogenic CO2-reduction, which might be directly inferred by lowered thermodynamic constraints. The investigations will include parallel biological experiments with open microbiomes and pure cultures. Assays with methanogens from the Methanothrix genus holds the promise to allow for a direct determination of 13C fractionation for H2-free methanogenesis from CO2 as they can perform the CO2 reduction only through direct electron transfer mechanisms.
生物电化学系统允许以甲烷(CH 4)的形式存储电能,甲烷是一种可运输的气体,可以从现有的天然气基础设施中受益。在这些生物反应器中,阴极通过厌氧微生物组为二氧化碳(CO2)还原成甲烷(CH 4)提供电子。该提议的目标可以分为两条线:i)开发和研究Fe4.5Ni4.5S8电极,其模拟产甲烷过程的重要酶的催化性质;和ii)使用碳同位素分析来支持生物反应器中从CO2形成CH 4的综合过程分析和模拟。动力学同位素效应研究的假设是,在使用直接电子转移途径的CH 4形成中,13 C分馏取决于产甲烷代谢的可用自由能,类似于氢营养产甲烷。例如,通过细菌、古细菌和藻类在自养CO2固定过程中观察到可变的13 C分馏。因此,如果我们证实了这一假设,我们可以开发一个模型框架,使用13 C分析数据,详细描述产物形成产率与热力学相关的生长动力学和详细计算的稳定碳同位素分馏。这个模型应该是有效的产甲烷CO2还原路线使用不同的电子供体。因此,将应用气体扩散阴极以允许电子供体源的立即改变,即氢气(H2)的放气或提供电流。最终,通过基于13 C的热力学诊断,将提供用于比较新型Fe4.5Ni4.5S8与基准电极的理想条件。我们预计,氢化酶和CO-脱氢酶功能模拟物从Fe4.5Ni4.5S8电极可以提高产甲烷CO2-还原,这可能是直接推断降低热力学约束。调查将包括开放微生物组和纯培养物的平行生物学实验。用产甲烷菌属的产甲烷菌进行的测定有希望允许直接测定从CO2中无H2产甲烷的13 C分馏,因为它们只能通过直接电子转移机制进行CO2还原。

项目成果

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Professor Dr. Ulf-Peter Apfel其他文献

Professor Dr. Ulf-Peter Apfel的其他文献

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{{ truncateString('Professor Dr. Ulf-Peter Apfel', 18)}}的其他基金

Electro- and Photocatalytic CO2 Reduction with [FeNi]-Chalcogenides
使用 [FeNi]-硫属化物电催化和光催化 CO2 还原
  • 批准号:
    397789315
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Bio-inspired Carbon Dioxide Activation on Heterobimetallic Complexes
异双金属配合物的仿生二氧化碳活化
  • 批准号:
    256826550
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Independent Junior Research Groups
Metal cooperativity for visible-light driven CO2 reduction with new photosensitizers and catalysts (CO2-COP)
新型光敏剂和催化剂对可见光驱动二氧化碳还原的金属协同作用(CO2-COP)
  • 批准号:
    428643898
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Enzyme, Electrode and Reactor Design for Enzymatic Cascade Reactions
酶级联反应的酶、电极和反应器设计
  • 批准号:
    536424308
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Electrobiochemistry and whole-cell biocatalysis: Power to value-added products through separated anode/cathode reactions
电化学和全细胞生物催化:通过分离的阳极/阴极反应为增值产品提供动力
  • 批准号:
    536337083
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Cyclam Based Transition Metal Complexes and Their Performance in Established and New Application Areas
基于 Cyclam 的过渡金属配合物及其在现有和新应用领域中的性能
  • 批准号:
    383043091
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Novel bio-synthetic constructs for the analysis and manipulation of the hydrogen catalysis of [FeFe]-hydrogenases
用于分析和操作[FeFe]-氢化酶氢催化的新型生物合成结构
  • 批准号:
    436793189
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Design of an electrochemical bioproduction system for piperazines
哌嗪电化学生物生产系统的设计
  • 批准号:
    445397982
  • 财政年份:
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes

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海拔对榕小蜂群落多样性及榕-蜂互惠体系的影响
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