Solid Amine Gas Adsorption Material Synthesis via Acidic Gas Templating
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Solution Overview
Problem
Existing methods for preparing solid amine gas adsorption materials face challenges such as complex processes, high costs, poor selectivity, stability, and adsorption capacity, particularly due to uneven distribution of organic amines and inactivation issues during synthesis, leading to suboptimal carbon dioxide capture efficiency.
Innovation Solution
A one-step method involving the introduction of acidic gases like CO2 into a silicate solution with organic amines, which creates homogeneous SiO2 pore channels and evenly distributes amines on the surface, protecting them from hydrogen bonding inactivation, using fly ash as a cost-effective silica source, and optimizing the silicate solution concentration and pH for enhanced adsorption material synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If impregnation method is used to prepare solid amine adsorption material, then high amine content and high absorbing ability are obtained, but amine is not tightly bound to support and suffers loss due to volatilization at higher temperatures
Solution Approach 1:
The patent creates a composite material structure where amine groups are chemically bonded to the support surface, forming a stable hybrid system that combines the high amine content benefit of impregnation with the thermal stability of chemical bonding. The amine-functionalized support forms an integrated composite where the amine is covalently attached, preventing volatilization while maintaining high concentration.
2Reliability
If chemical bond grafting method is used to prepare solid amine adsorption material, then high stability is obtained, but preparation process is complicated and amine group grafting amount is relatively low
Solution Approach 1:
The patent merges the support preparation and amine loading steps into a single integrated process. The support material is directly synthesized with amine groups incorporated during the formation process, eliminating the need for separate grafting steps while achieving both high stability and high amine content simultaneously.
Solution Approach 2:
The support material serves dual functions: it provides the structural framework and simultaneously acts as the substrate for amine attachment. The support structure itself facilitates the incorporation of amine groups during its formation, making the system self-assembling and eliminating complex external grafting procedures.
3Quantity of substance
If organic amine is loaded on solid support to achieve high adsorption capacity, then adsorption ability improves, but amine functional groups fail to form effective carbon dioxide capture sites homogeneously
Solution Approach 1:
The patent ensures that amine groups are distributed with uniform local density throughout the support structure. By incorporating amine groups during support formation, each region of the material achieves consistent amine concentration and functionality, creating homogeneous active sites for CO2 capture across the entire adsorbent volume.
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
This method results in a stable and selective solid amine gas adsorption material with improved adsorption capacity and rate, utilizing fly ash efficiently and achieving higher CO2 capture performance compared to traditional methods.
Implementation Method 1
a certain amount of acidic gas is introduced while organic amine molecules are introduced into a silicate solution as template agents, which not only makes sizes of SiO2 pore channels homogeneous
Implementation Method 2
the synergism of physical adsorption and chemical adsorption greatly improve the adsorption efficiency
Implementation Method 3
the acidic gas protects -NH2 groups of organic amine, and avoids -NH2 adhesion inactivation due to hydrogen bonding during the synthesis process of the material
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a method for preparing a solid amine gas adsorption material. The method synthesizes a porous solid amine gas adsorption material that loads organic amine evenly in one step. In the method, a certain amount of acidic gas is introduced while organic amine molecules are introduced into a silicate solution as template agents, which not only makes sizes of SiO2 pore channels homogeneous, but also makes organic amine molecules highly evenly distributed on a surface of SiO2. In addition, the acidic gas protects -NH2 groups of organic amine, and avoids -NH2 adhesion inactivation due to hydrogen bonding during the synthesis process of the material. The present invention also relates to a method for preparing a solid amine gas adsorption material after obtaining a silicate solution from fly ash. The preparation methods of the present invention are simple in process and do not require special devices. The solid amine gas adsorption material prepared has more stable and effective gas adsorption performance.