Mesoporous Carbon Sorbents for Selective CO2 Capture
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Solution Overview
Problem
Existing carbon capture technologies for CO2 separation are energy-intensive, costly, and lack selectivity for CO2 relative to water vapor and nitrogen, making them inefficient for capturing CO2 from gas streams.
Innovation Solution
Development of a mesoporous carbon sorbent with a Barrett-Joyner-Halenda (BJH) average pore width greater than 3 nm and a selectivity for CO2 to nitrogen greater than 20.00, formed by polymerizing hydroxylated benzene and aldehyde with optional nitrogen-containing materials and pyrolyzing the polymer to create a carbon sorbent with specific pore properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CO2 separation methods (chemical absorption, physical absorption, membrane separation, cryogenic methods) are used, then CO2 can be removed from gas streams, but the processes are energy intensive and costly
Solution Approach 1:
The patent employs mesoporous carbon sorbents with controlled pore sizes (3-50 nm) to achieve CO2 separation through adsorption. The porous structure provides high surface area and selective pore dimensions that favor CO2 adsorption over other gases, enabling separation without the high energy consumption of conventional thermal or chemical methods
Solution Approach 2:
The patent modifies the physical parameters of carbon materials by controlling pore size distribution, surface area, and surface chemistry during synthesis. By adjusting these parameters, the sorbent achieves optimal CO2 selectivity and capacity at moderate temperatures, avoiding the high energy requirements of conventional methods
2Reliability
If conventional adsorbents (zeolites, carbon molecular sieves, activated carbons) are used for CO2 capture, then physical adsorption can occur, but they do not exhibit high selectivity for CO2 relative to water vapor, nitrogen, and methane
Solution Approach 1:
The patent introduces nitrogen-containing groups at specific locations within the carbon sorbent structure to create localized sites with high CO2 affinity. This local modification of surface chemistry provides selective interaction with CO2 molecules while maintaining the overall porous structure for mass transport
Solution Approach 2:
The patent creates composite carbon sorbents combining carbon matrix with nitrogen-containing functional groups. This composite structure integrates the porous framework of carbon materials with the selective binding sites provided by nitrogen-containing compounds, achieving both capacity and selectivity
3Reliability
If chemical absorption processes are used for CO2 removal, then CO2 can be captured with reasonable selectivity, but the systems require large capital expenses to construct and operate
Solution Approach 1:
The patent employs solid carbon sorbent materials that can be regenerated and reused, replacing the need for expensive chemical reagents and complex equipment. The carbon sorbents undergo simple thermal regeneration to restore their CO2 adsorption capacity, reducing operational and capital costs
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 mesoporous carbon sorbent effectively captures CO2 with high selectivity over N2 and low water capacity, improving CO2 capture efficiency and reducing energy consumption.
Implementation Method 1
a mesoporous carbon sorbent for removal of carbon dioxide from a gaseous material... a selectivity of carbon dioxide to nitrogen greater than about 20.00
Implementation Method 2
polymerizing the hydroxylated benzene and the formaldehyde to form a porous polymer including the nitrogen-containing material
Implementation Method 3
pyrolyzing the porous polymer to form a mesoporous carbon sorbent having an average pore width greater than about 3 nm
Data Source
AI summary
A mesoporous carbon sorbent for removal of carbon dioxide from a gaseous material includes a BJH average pore width greater than about 3 nm, and a selectivity of carbon dioxide to nitrogen greater than about 20.00 at about 30° C., a partial pressure of carbon dioxide of about 114 mmHg, and a partial pressure of nitrogen of about 646 mmHg. Related mesoporous carbon sorbents, and methods of forming the carbon sorbents are also disclosure.