Sorbent-Based CO2 Capture for Low-Carbon Synthetic Fuel Synthesis
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Solution Overview
Problem
Current technologies for capturing carbon dioxide from the atmosphere are inefficient due to low CO2 concentrations and large volumes of atmospheric air, making it challenging to produce low-carbon intensity fuels effectively.
Innovation Solution
A method involving the extraction of CO2 from atmospheric air using sorbent materials, followed by processing in a CO2 reduction reactor with hydrogen to produce synthetic fuels through the Fischer-Tropsch process, which includes steps like calcining calcium carbonate solids and reacting carbon monoxide with hydrogen to form synthetic fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CO2 is captured from atmospheric air using conventional technologies, then CO2 can be recovered for fuel synthesis, but the process is inefficient due to low CO2 concentrations and large volumes of air required
Solution Approach 1:
The patent employs sorbent materials with specific chemical properties that change their affinity for CO2 under different conditions. The sorbent undergoes chemical transformation when exposed to atmospheric CO2, forming carbonate species that can be subsequently regenerated through calcination, enabling efficient CO2 capture from dilute atmospheric sources
Solution Approach 2:
The invention uses composite sorbent materials combining multiple functional components: alkaline materials for CO2 absorption, structural supports for stability, and catalytic promoters for enhanced reactivity. These composite structures enable effective CO2 capture from low-concentration atmospheric air while maintaining material stability and regenerability
2Object-generated harmful factors
If synthetic fuels are produced from atmospheric CO2, then low carbon intensity fuels can be synthesized, but the process requires significant energy input for CO2 capture and conversion
Solution Approach 1:
The process utilizes phase transitions in the sorbent material, transitioning from an active absorption phase to a regeneration phase through controlled heating (calcination). This phase change enables the sorbent to release captured CO2 in a concentrated form, reducing the energy required for subsequent conversion processes compared to handling dilute atmospheric CO2 directly
Solution Approach 2:
The sorbent material performs preliminary concentration of CO2 from atmospheric air before the fuel synthesis process. By pre-concentrating CO2 through chemical absorption and subsequent thermal regeneration, the system reduces the energy input required for the Fischer-Tropsch conversion process, as concentrated CO2 feeds more efficiently than dilute atmospheric air
3Quantity of substance
If CO2 is concentrated through calcination of carbonate solids, then recovered CO2 feed stream is produced, but thermal energy is required for the calcination process
Solution Approach 1:
The sorbent material operates in periodic cycles: first absorbing CO2 from atmospheric air during the day or during low-energy periods, then undergoing calcination during regenerative phases. This periodic operation allows the system to concentrate CO2 effectively while managing thermal energy requirements through intermittent rather than continuous high-temperature processing
Solution Approach 2:
The carbonate solid acts as an intermediary carrier that temporarily stores CO2 in a stable, concentrated form. Instead of directly heating atmospheric air to high temperatures, the sorbent material serves as a mediator that concentrates CO2 through chemical binding, then releases it through controlled calcination, reducing the overall thermal energy requirement compared to direct thermal concentration methods
Data Source
AI summary
A method for producing a synthetic fuel includes extracting carbon dioxide (CO2) from a flow of atmospheric air with a sorbent material to form a recovered carbon dioxide feed stream; extracting hydrogen (H2) from a hydrogen-containing feedstock to produce a hydrogen feed stream; processing the recovered carbon dioxide feed stream in a CO2 reduction reactor to produce a carbon monoxide (CO) stream by applying an electric potential to the CO2 reduction reactor and reducing at least a portion of the recovered carbon dioxide feed stream over a catalyst to form the carbon monoxide stream and an oxygen (O2) stream; and reacting the carbon monoxide stream from the CO2 reduction reactor with the hydrogen feed stream to produce the synthetic fuel.