Solid Amine CO2 Adsorbent With Macroporous Alumina for Cycle Stability
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Solution Overview
Problem
Existing solid amine materials for CO2 capture suffer from severe chemical deactivation due to urea chain compound formation during regeneration, leading to a sharp decline in adsorption capacity and cyclic stability, which is a challenge for efficient CO2 capture and storage.
Innovation Solution
A method involving the preparation of a solid amine adsorbent using pseudo boehmite, pore enlargement, calcination, and impregnation with an organic amine solution to create a macroporous nanometer aluminum oxide matrix, which avoids urea chain formation by converting primary amine functional groups to secondary amine groups, enhancing cyclic stability and CO2 adsorption capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If solid amine materials are used for CO2 capture, then CO2 adsorption capacity is improved, but urea chain compounds form during regeneration causing chemical deactivation and sharp decline of adsorption capacity
Solution Approach 1:
The patent employs a porous aluminum oxide support material with specific pore structure to承载 the amine functional groups. The porous structure provides high surface area for amine loading while facilitating mass transfer and reducing urea chain formation through improved diffusion pathways, thereby maintaining cyclic stability alongside high CO2 adsorption capacity
Solution Approach 2:
The patent creates a composite material system combining aluminum oxide support with organic amine functional groups. This composite structure leverages the thermal and mechanical stability of aluminum oxide while incorporating the CO2-selective binding properties of amines, achieving both high adsorption capacity and regeneration stability through synergistic material combination
2Productivity
If solid amine materials are regenerated under realistic atmosphere, then CO2 enrichment is achieved, but severe chemical deactivation occurs due to urea chain compound formation
Solution Approach 1:
The patent optimizes critical parameters including amine loading density, support pore size distribution, and material composition ratio to prevent urea chain formation. By controlling these parameters, the system enables effective CO2 enrichment during regeneration while minimizing harmful chemical side reactions that lead to deactivation
3Quantity of substance
If high CO2 adsorption capacity is achieved, then capture efficiency is improved, but preparation cost and complexity increase
Solution Approach 1:
The patent employs cost-effective aluminum oxide as the support material, which is abundant and inexpensive compared to alternative supports like activated carbon or specialized polymers. This choice enables high CO2 adsorption capacity through optimized amine loading while keeping the overall preparation cost low and the manufacturing process straightforward
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 prepared solid amine adsorbent exhibits high CO2 adsorption capacity exceeding 5 mmol/g and maintains adsorption capacity above 4.8 mmol/g after 50 cycles with minimal decay, suitable for industrial applications with low environmental impact and cost.
Implementation Method 1
avoiding formation of urea chain compounds by converting primary amine functional groups to secondary amine functional groups
Implementation Method 2
Solid amine materials have the advantages of high CO2 selectivity, low regeneration energy consumption
Data Source
AI summary
A method for preparing a solid amine adsorbent of CO2 includes introducing a gas mixture containing 10 vol. % to 50 vol. % of CO2 is introduced into a sodium aluminate solution having a concentration in a range of 10 g/L to 100 g/L at room temperature to obtain a reaction solution. This occurs continuously until a pH value of the reaction solution is lowered to 9.5 to 9.8 to obtain a product solution containing a precipitate. The precipitate is filtered and washed. The filtered and washed precipitate is mixed with an organic alcohol at a mass ratio of 1:5 to 1:30 to obtain a suspension. The suspension is heated to an azeotropic point of water and the organic alcohol, and evaporated, boiled, and refluxed to obtain pore-enlarged pseudo boehmite. This is calcined to obtain aluminum oxide powder. The aluminum oxide powder is impregnated in an organic amine solution and dried.