Covalently Bonded Amine Sorbents for Hydrothermal CO2 Capture
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Solution Overview
Problem
Existing physisorbent materials for carbon dioxide capture have reduced adsorption capacity due to interference by polar molecules like water, while chemisorbents offer superior selectivity but require improvements in adsorption capacity, kinetics, and stability.
Innovation Solution
Development of solid sorbents with amines covalently bonded to a porous support, utilizing amine alkylation and silanization reactions to enhance CO2 adsorption capacity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If physisorbent materials are used for CO2 capture, then the system is relatively mature and easy to operate, but the CO2 adsorption capacity is significantly reduced due to interference by polar molecules like water
Solution Approach 1:
The patent uses composite materials by combining amine-functionalized silica particles (chemisorbent) with a porous support structure. This composite approach allows the material to exhibit both the high CO2 selectivity of chemisorbents and the structural stability of porous supports, resolving the contradiction between ease of operation and CO2 adsorption capacity by creating a hybrid material that overcomes the limitations of pure physisorbents
2Quantity of substance
If chemisorbent materials are used for CO2 capture, then the selectivity of CO2 adsorption over interfering species is superior, but the adsorption capacity, kinetics, and stability require improvement
Solution Approach 1:
The patent employs porous materials by utilizing a porous support structure with controlled pore size and distribution. This porous architecture provides high surface area for amine functionalization while maintaining structural integrity during cycling and hydrothermal conditions, thereby improving both adsorption capacity and stability simultaneously
Solution Approach 2:
The patent applies parameter changes by optimizing the amine loading density, pore size distribution, and surface area of the sorbent material. By carefully controlling these parameters during synthesis, the material achieves enhanced CO2 adsorption capacity while maintaining fast kinetics and improved hydrothermal stability, resolving the contradiction between selectivity and reliability
3Quantity of substance
If amine functionalized silica particles are used, then CO2 adsorption through reversible chemical reactions is achieved, but the cost and complexity of synthesis increase compared to physisorbents
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the porous support structure before functionalizing it with amine groups. This sequential approach allows for optimized control of each synthesis step, improving manufacturing efficiency while achieving the desired high CO2 adsorption capacity through the combined effects of the porous structure and amine functionality
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 solid sorbents exhibit high CO2 adsorption capacity and desirable hydrothermal and cycling stability, addressing the limitations of physisorbents and enhancing the performance of chemisorbents.
Implementation Method 1
Chemisorbents, in particular, amine functionalized silica particles and metal-organic frameworks (MOF) etc., adsorb CO2 through reversible chemical reactions and formation of ammonium carbamate, carbamic acid, ammonium carbonate and/or ammonium bicarbonate
Implementation Method 2
reacting the first mixture in a silanization reaction to form a grafted sorbent including the grafter attached to the sorbent
Implementation Method 3
reacting the second mixture in an amine alkylation reaction to form the functionalized sorbent
Data Source
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AI summary
Described herein are solid sorbents including amines that are covalently bonded to a porous support. The solid sorbents exhibit high adsorption capacities for carbon dioxide. The solid sorbents exhibit desirable hydrothermal and cycling stability.