Amorphous Composite Metal Oxide Adsorbent for High-Temperature CO2 Capture
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Solution Overview
Problem
Current adsorbents for capturing carbon dioxide from flue gas at intermediate temperatures (150 to 400 °C) are complex and costly, requiring cooling or heating of flue gas, and lack high adsorption performance.
Innovation Solution
A composite metal oxide adsorbent with an amorphous structure, composed of a divalent first metal, a trivalent second metal, and an element with electronegativity between 2.0 and 4.0 on the Pauling scale, manufactured through a method involving pH adjustment, precipitation, ion exchange, and calcination, enhancing adsorption performance and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adsorbents (MOF, zeolite, carbon) are used for low temperature CO2 capture, then adsorption performance is improved, but process complexity and additional costs increase due to required cooling or heating
Solution Approach 1:
The invention changes the operating temperature parameter by developing an adsorbent that functions effectively at ambient to moderately elevated temperatures (up to 400°C), eliminating the need for cooling or heating processes. This is achieved through selecting specific metal oxides (CaO, SrO, BaO, MgO) and controlling synthesis conditions to optimize surface properties for high-temperature CO2 adsorption.
Solution Approach 2:
The invention uses composite metal oxide materials combining divalent metals (Ca, Sr, Ba, Mg) with controlled surface properties. These composite structures provide both high CO2 adsorption capacity and thermal stability, replacing the need for complex temperature control systems while maintaining effective adsorption performance.
2Stability of the object's composition
If adsorbents are designed for high temperature operation, then thermal stability is improved, but adsorption performance decreases
Solution Approach 1:
The invention applies local quality by creating metal oxide adsorbents with specific surface characteristics (high surface area, controlled porosity, specific surface chemistry) that maintain high CO2 adsorption affinity even at elevated temperatures. The bulk material provides thermal stability while the surface properties enable effective adsorption, resolving the contradiction between thermal stability and adsorption performance.
3Reliability
If flue gas is cooled to use low temperature adsorbents, then adsorption performance is improved, but energy consumption and process complexity increase
Solution Approach 1:
The invention changes the temperature parameter from low temperature (requiring cooling) to ambient or moderately elevated temperatures where the metal oxide adsorbents naturally function. This eliminates energy-consuming cooling processes while maintaining high CO2 adsorption performance through the inherent properties of the metal oxide materials.
4Stability of the object's composition
If conventional adsorbents require heating for high temperature operation, then thermal stability is improved, but process complexity and costs increase
Solution Approach 1:
The invention changes the operating temperature parameter to match the natural operating range of metal oxide adsorbents, which are inherently stable at ambient to moderately elevated temperatures. This eliminates the need for heating processes and associated equipment, simplifying the overall system while maintaining thermal stability and adsorption effectiveness.
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 composite metal oxide adsorbent demonstrates superior carbon dioxide adsorption capacity and thermal stability, maintaining high performance across a range of temperatures from 150 to 400 °C, with enhanced specific surface area and improved adsorption efficiency.
Implementation Method 1
an adsorbent having a relatively high adsorption performance is required
Implementation Method 2
which has a relatively high adsorption performance and thermal stability and works at a relatively high temperature
Data Source
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AI summary
An adsorbent for carbon dioxide may include a composite metal oxide including a divalent first metal (M1), a trivalent second metal (M2), and an element (A) with an electronegativity of about 2.0 to about 4.0. The composite metal oxide may have an amorphous structure. A method of manufacturing the adsorbent for carbon dioxide and a capture module for carbon dioxide including the adsorbent for carbon dioxide are also disclosed.