Aminated Magnesium Oxide Adsorbent for Ambient CO2 Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current CO2 capture technologies face challenges with adsorbents that have low CO2 adsorption capacity, high energy consumption for regeneration, corrosive properties, and mass losses, particularly at ambient conditions, and existing MgO-based adsorbents require high temperatures for effectiveness.
Innovation Solution
Development of an aminated magnesium oxide adsorbent with a magnesium oxide matrix and impregnated polyamine, specifically prepared by precipitating magnesium hydroxide from a magnesium salt and ammonium hydroxide, followed by calcination and wet impregnation with a polyamine, resulting in a material with disordered mesopores and suitable surface area for efficient CO2 capture at ambient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aqueous amine solutions (MEA, DEA, MDEA) are used for CO2 capture, then CO2 absorption capacity is improved, but corrosiveness and energy consumption increase
Solution Approach 1:
The patent employs a porous solid support material (such as silica gel, activated carbon, or polymer resins) with controlled pore size and surface area to provide a large surface area for amine functional group attachment, enabling high CO2 capacity while maintaining a non-corrosive solid-phase system
Solution Approach 2:
The invention creates a composite material by combining amine functional groups with a porous solid support matrix, merging the CO2 absorption capability of amines with the structural stability and non-corrosive nature of the solid support, thereby achieving both high capacity and low corrosiveness
2Quantity of substance
If aqueous amine solutions are used for CO2 capture, then CO2 absorption capacity is improved, but energy consumption for regeneration increases
Solution Approach 1:
The patent modifies the physical and chemical parameters of the amine system by transitioning from aqueous to non-aqueous or solid-phase amines, and by adjusting amine loading, pore size, and surface area to optimize CO2 capacity while reducing the energy required for desorption and regeneration processes
3Quantity of substance
If conventional adsorbents are used for CO2 capture, then CO2 adsorption capacity is limited, but operating at ambient conditions is required
Solution Approach 1:
The patent utilizes porous materials with optimized pore size, surface area, and pore volume to enhance CO2 adsorption capacity at ambient temperature and pressure conditions, eliminating the need for high-temperature operation required by conventional adsorbents
Solution Approach 2:
The invention changes the physical and chemical parameters of the adsorbent material, including surface area, pore volume, amine functional group density, and material composition, to achieve high CO2 capacity specifically optimized for ambient operating conditions
4Quantity of substance
If existing adsorbents are used for CO2 capture, then CO2 capacity may be adequate, but mass losses occur during use
Solution Approach 1:
The patent employs highly stable solid support materials and robust amine-functionalized structures that resist degradation, leaching, and mass loss during repeated adsorption-desorption cycles, ensuring long-term operational stability and maintaining CO2 capacity over extended use
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 aminated magnesium oxide adsorbent demonstrates a CO2 uptake capacity of 24 to 60 mg CO2 per gram at 30°C and 1 atm, with effective regeneration and reduced energy consumption, addressing the limitations of existing adsorbents by operating efficiently at ambient conditions.
Implementation Method 1
The aminated magnesium oxide adsorbent demonstrates a CO2 uptake capacity of 24 to 60 mg CO2 per gram at 30°C and 1 atm
Implementation Method 2
precipitating magnesium hydroxide from a magnesium salt and ammonium hydroxide
Data Source
AI summary
An aminated magnesium oxide adsorbent containing a magnesium oxide matrix having disordered mesopores and a BET surface area of 320 to 380 m2/g, and a polyamine selected from the group consisting of an ethyleneamine having a molecular weight of up to 450 g/mol and a polyethylene imine having a number average molecular weight of greater than 500 g/mol and up to 20,000 g/mol, wherein the polyamine is impregnated within the disordered mesopores of the magnesium oxide matrix. A method of making the aminated magnesium oxide adsorbent and a method of capturing CO2 from a gas mixture with the aminated magnesium oxide adsorbent are also described.