Electrochemical CO2-to-C2 Coupling for Microbial Chain Elongation
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Solution Overview
Problem
Existing carbon dioxide conversion technologies are limited by inefficient electron and mass transfers, unfavorable metabolic kinetics, and inadequate molecular building blocks, hindering the efficient conversion of CO2 to value-added chemicals.
Innovation Solution
A method involving an electrochemical cell for CO2 reduction coupled with microbial fermentation, utilizing a CO2RR catalyst and a microbe capable of converting C2 compounds to C2+n compounds, with a four-tier system design for efficient mass transfer and metabolic integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photosynthesis is used to convert CO2 to chemicals, then carbon fixation occurs, but the efficiency is limited to about 1% due to inefficient carbon conversion by RubisCO and energy-extensive regeneration of carbon intermediates
Solution Approach 1:
The patent replaces the biological photosynthetic system (RubisCO enzyme) with an artificial electrochemical system consisting of CO2 reduction catalysts and microbial fermentation systems. This substitution eliminates the inefficiencies of natural photosynthesis while achieving higher carbon conversion efficiency and productivity.
Solution Approach 2:
The patent changes the fundamental conversion parameters by using electrochemical reduction to produce C2 compounds (ethylene, ethanol, acetate) as intermediates, which are then fermented by microbes to produce target chemicals. This two-stage process with optimized parameters achieves superior efficiency compared to direct photosynthetic conversion.
2Adaptability or versatility
If conventional CO2 conversion platforms are used, then carbon dioxide capture occurs, but the scope of diverse chemical compounds obtainable is still limited
Solution Approach 1:
The patent creates a universal CO2 conversion platform that can produce multiple diverse chemical compounds (fuels, chemicals, materials) through the combination of electrochemical reduction and microbial fermentation. The system's versatility is enhanced by the ability to select different microbial strains and fermentation conditions to produce various target products from the same C2 intermediate pool.
3Productivity
If electrochemical CO2 reduction coupled with bioconversion is used, then carbon dioxide conversion to value added chemicals occurs, but inefficient electron and mass transfers limit the process
Solution Approach 1:
The patent introduces C2 compounds (ethylene, ethanol, acetate) as intermediary molecules that bridge the electrochemical reduction stage and the microbial fermentation stage. These intermediaries facilitate efficient electron and mass transfer between the two stages, enabling high overall conversion efficiency while minimizing energy losses.
4Productivity
If conventional CO2 conversion methods are used, then some chemical synthesis occurs, but unfavorable metabolic kinetics hinder efficient conversion
Solution Approach 1:
The patent performs preliminary electrochemical reduction of CO2 to C2 compounds before introducing them to the microbial fermentation system. This preliminary action creates optimized substrates that enhance subsequent microbial metabolism kinetics, thereby increasing overall conversion rates and reducing process time.
5Adaptability or versatility
If existing CO2 conversion technologies are used, then carbon fixation occurs, but inadequate molecular building blocks limit product diversity
Solution Approach 1:
The patent segments the CO2 conversion process into two distinct stages: electrochemical reduction to C2 compounds and microbial fermentation to final products. This segmentation allows each stage to be independently optimized and enables the use of C2 compounds as versatile molecular building blocks that can be directed toward multiple different product pathways, enhancing versatility without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves a 2 to 10-fold increase in microbial biomass productivity and higher productivity of medium-chain-length PHA polymers compared to C1 intermediate and hydrogen-driven routes, facilitating the production of value-added chemicals like lipids and fuels.
Implementation Method 1
introducing carbon dioxide to a system comprising an electrochemical cell comprising a carbon dioxide reducing catalyst and an electrolyte under conditions suitable for conversion of carbon dioxide to one or more C2 compounds
Implementation Method 2
introducing at least a portion of the one or more C2 compounds to a second system comprising a microbe and a media under conditions suitable for conversion of the C2 compounds to one or more C2+n compounds
Data Source
AI summary
A method for the production of value added chemicals comprising: introducing carbon dioxide to a system comprising an electrochemical cell comprising a carbon dioxide reducing catalyst and an electrolyte under conditions suitable for conversion of carbon dioxide to one or more C2 compounds; introducing at least a portion of the one or more C2 compounds to a second system comprising a microbe and a media under conditions suitable for conversion of the C2 compounds to one or more C2+n compounds where n is from about 1 to about 100. A method of preparing value added chemicals comprising: a means for converting carbon dioxide to one or more C2 compounds and a microbe wherein the C2 compound is contacted with the microbe under conditions suitable for the formation of one or more C2+n compounds.