Silicon-Based Solid Amine Sorbent for CO2 Capture
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Solution Overview
Problem
The existing silicon-based solid amine sorbents for CO2 have limited CO2 adsorption capacity due to their small pore volume and low specific surface area, which restricts their application in CO2 capture and storage.
Innovation Solution
A method for preparing a silicon-based solid amine sorbent for CO2 involves using a silicate solution or liquid organosilicate as a silicon source, followed by a precipitation reaction, filtration, azeotropic distillation, calcination, and impregnation with an organic amine solution to enhance the support's pore volume and surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional silicon-based support is used with limited pore volume and specific surface area, then the structure is simple and easy to manufacture, but the CO2 adsorption capacity is limited
Solution Approach 1:
The patent applies porous materials by developing a silicon-based support with optimized pore structure through controlled precipitation and aging processes. The support achieves a pore volume of 2.5-3.5 cm³/g and specific surface area of 800-1000 m²/g, creating a highly porous structure that dramatically increases CO2 adsorption capacity while maintaining structural integrity
Solution Approach 2:
The patent employs composite materials by combining silicon-based support with organic amine functional groups to create a composite sorbent structure. The silicon support provides the porous framework while the organic amine components provide active adsorption sites, achieving synergistic enhancement of CO2 adsorption performance
2Volume of stationary object
If the pore volume of silicon support is increased beyond 2.0 cm³/g, then the CO2 adsorption capacity can be increased, but the manufacturing difficulty increases
Solution Approach 1:
The patent applies parameter changes by systematically optimizing precipitation conditions including pH (adjusted to 7-9 using ammonia water), temperature (20-40°C), and aging time (12-48 hours). These parameter adjustments control the crystallization process to achieve the target pore volume of 2.5-3.5 cm³/g and specific surface area of 800-1000 m²/g with reproducible manufacturing
Solution Approach 2:
The patent implements preliminary action through a controlled aging process (12-48 hours at 20-40°C) before calcination. This preliminary treatment allows the precipitated silicon hydroxide to develop the desired porous structure in advance, ensuring that the final calcined support achieves the target pore volume and surface area without requiring complex post-processing
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 resulting silicon-based solid amine sorbent exhibits a significantly increased CO2 adsorption capacity of up to 336 mg/g and maintains excellent adsorption-regeneration cycle performance with less than 7% attenuation after 10 cycles.
Implementation Method 1
mixing the silicon source liquid with a precipitant to perform a precipitation reaction to obtain a product liquid containing a precipitate, wherein the precipitate is a second silicate or silicic acid
Implementation Method 2
mixing the precipitate filtrated out but not dried yet with an organic alcohol and then performing an azeotropic distillation to obtain a dehydrated precipitate
Implementation Method 3
calcining the dehydrated precipitate to obtain a silicon-based support which is a powder of the second silicate or a silica powder
Implementation Method 4
impregnating the silicon-based support with an organic amine solution and then drying the silicon-based support impregnated with the organic amine solution to obtain the silicon-based solid amine sorbent for CO2
Implementation Method 5
The solid amine sorbent is composed of a support and an organic amine... The saturated CO2 adsorption capacity of the synthesized solid amine sorbent for CO2 reaches 336 mg/g
Data Source
AI summary
A silicon-based solid amine sorbent for CO2 and the making method thereof including: providing a silicon source liquid which is a silicate solution or a liquid organosilicate, wherein the silicate solution comprises water and a first silicate dissolved in the water; mixing the silicon source liquid with a precipitant to perform a precipitation reaction to obtain a product liquid containing a precipitate, wherein the precipitate is a second silicate or silicic acid; filtering out the precipitate and washing the precipitate with water; mixing the precipitate filtrated out but not dried yet with an organic alcohol and then performing an azeotropic distillation to obtain a dehydrated precipitate; calcining the dehydrated precipitate to obtain a silicon-based support, wherein the silicon-based support is a powder of the second silicate powder or a silica powder; and impregnating the silicon-based support with an organic amine solution and then drying to obtain the silicon-based amine-containing solid sorbent for CO2.