Covalently Bonded Amine Sorbents for Stable CO2 Capture
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Solution Overview
Problem
Existing chemisorbent materials for carbon dioxide capture face challenges with reduced CO2 adsorption capacity due to interference by polar molecules like water, and they lack fast adsorption kinetics and thermal 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, including functionalization ligands like polyamines and MOF compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If physisorbent materials are used for CO2 adsorption, then the system is relatively mature and easy to manufacture, but the CO2 adsorption capacity is significantly reduced due to interference by polar molecules such as H2O
Solution Approach 1:
The patent uses composite materials by combining porous support (such as silica, alumina, or MOF) with amine functional groups. This composite structure allows the material to leverage the porous structure for high surface area while the amine groups provide selective chemical binding for CO2, overcoming the limitation of physisorbents being interfered by water molecules.
Solution Approach 2:
The patent changes the adsorption mechanism from physical adsorption to chemical adsorption by introducing amine functional groups that form chemical bonds with CO2. This parameter change in the adsorption mechanism enables the material to achieve high CO2 capacity while maintaining resistance to water interference.
2Quantity of substance
If chemisorbent materials with amine functional groups are used, then CO2 adsorption capacity and selectivity are improved, but thermal and hydrothermal stability are reduced
Solution Approach 1:
The patent employs porous materials as the support structure (such as porous silica, alumina, or MOF) to provide high surface area and porosity for amine loading. The porous structure allows high CO2 capacity while the stability of the porous support itself contributes to the overall thermal and hydrothermal stability of the composite sorbent.
Solution Approach 2:
The porous support acts as an intermediary carrier that stabilizes the amine functional groups. The support structure provides a stable framework that prevents degradation of the amine groups under thermal and hydrothermal conditions, thereby maintaining both CO2 capacity and stability.
3Quantity of substance
If conventional chemisorbent materials are used, then CO2 selectivity is improved, but adsorption kinetics are slow
Solution Approach 1:
The patent uses porous materials with optimized pore sizes and high surface areas to enhance mass transport. The porous structure provides short diffusion paths for CO2 molecules to reach the amine functional groups, thereby improving adsorption kinetics while maintaining high CO2 selectivity.
Solution Approach 2:
The patent applies local quality by concentrating amine functional groups at specific locations on the porous support surface where they are most accessible to CO2. This localized distribution optimizes both selectivity and kinetics by ensuring high density of active sites are readily available for CO2 binding.
4Reliability
If solid sorbents with covalently bonded amines are developed, then CO2 adsorption capacity and stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing the porous support with amine groups through controlled chemical reactions during the manufacturing process. This preliminary functionalization ensures stable covalent bonding of amines to the support, achieving high reliability while the controlled nature of the process manages manufacturing 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 sorbents exhibit high CO2 adsorption capacity and desirable hydrothermal and cycling stability, overcoming interference from polar molecules and improving adsorption kinetics.
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
chemisorbent materials generally have superior selectivity of CO2 adsorption over other interfering species
Implementation Method 3
Physisorbents, such as activated carbon and zeolites, rely on van der Waals interactions to adsorb gaseous species such as CO2 and water (H2O)
Implementation Method 4
The functionalized sorbent includes a sorbent and at least one functionalization ligand covalently bonded to the sorbent, wherein the functionalization ligand includes a first amine-containing unit, and wherein the first amine-containing unit is formed by a process including amine alkylation between an alkyl halide and a second amine-containing unit
Data Source
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.