Functionalized Sorbent for CO2 Capture Kinetics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid sorption methods for capturing unwanted gases in flue gas streams are limited by volatility, corrosion, slow capture kinetics, and reduced capacity over time, necessitating the development of stable, high-capacity solid-phase sorbents with fast sorption kinetics and long-term retention capabilities.
Innovation Solution
A sequentially functionalized, porous solid-state sorbent with a preselected porous support material, functionalized with short-length and polyfunctional amino silanes, providing a high density of active binding sites for selective retention of target analytes, including gases like CO2, with enhanced sorption capacity and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If liquid amines are used for gas sorption, then sorption capacity is achieved, but volatility, corrosion, and degradation occur leading to reduced long-term reliability
Solution Approach 1:
The patent employs a porous solid support material with controlled pore size (30-500 Å), pore volume (≥0.5 cc/g), and surface area (≥150 m²/g) to provide a stable framework for amine functionalization. The porous structure enables high sorption capacity while maintaining solid-phase stability, eliminating the volatility and degradation issues of liquid amines.
Solution Approach 2:
The invention creates a composite material by functionalizing a porous solid support (metal oxides, ceramics, or metal silicates) with amino silanes. This composite structure combines the stability of the inorganic support with the sorption activity of the amine groups, achieving both high capacity and long-term reliability.
2Quantity of substance
If conventional sorbents are used, then some sorption capacity is achieved, but sorption kinetics are slow reducing productivity
Solution Approach 1:
The patent applies local quality by functionalizing the porous support with amino silanes at specific locations within the pores. The sequential functionalization creates zones of high amine density (≥3 amine groups per nm²) at the pore surfaces, enabling fast sorption kinetics while maintaining overall high capacity through the extended porous network.
Solution Approach 2:
The invention transitions from two-dimensional surface sorption to three-dimensional pore-network sorption. The porous structure provides volumetric distribution of active sites throughout the material, enabling rapid mass transfer and high productivity while maintaining high sorption capacity through the three-dimensional architecture.
3Quantity of substance
If high functional density is achieved through amine groups, then sorption capacity increases, but pore blockage may occur reducing accessibility
Solution Approach 1:
The patent applies preliminary action by first functionalizing the porous support with amino silanes before introducing the target gases. The sequential functionalization process ensures proper orientation and distribution of amine groups, creating accessible binding sites with high density without blocking pore entrances. The pore size (30-500 Å) is specifically selected to accommodate the functionalized structure while maintaining gas accessibility.
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 sorbent achieves rapid and efficient capture and retention of target gases, demonstrating superior sorption kinetics and capacity compared to conventional liquid and solid sorbents, with CO2 residual concentrations below 0.01% in less than one second and maintaining stability up to 175°C.
Implementation Method 1
short-length (e.g., 5-20 Å) amino silanes that are chemically attached to surfaces (e.g., walls) of the pores
Implementation Method 2
Amine functional groups present on the backbone of the highly functionalized silanes of the sorbent define active binding sites that provide the sorbent with a preselected functional density, selectivity, and capacity for retention of preselected target analytes
Data Source
AI summary
A highly functionalized sorbent and sequential process for making are disclosed. The sorbent includes organic short-length amino silanes and organic oligomeric polyfunctional amino silanes that are dispersed within pores of a porous support that form a 3-dimensional structure containing highly functionalized active binding sites for sorption of analytes.