Potassium Silicate Binder CO2 Capture Monolith
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Solution Overview
Problem
Existing carbon dioxide capture technologies face challenges such as high energy consumption, thermal and oxidative solvent degradation, and the formation of corrosion products, particularly in liquid amine solutions. Additionally, high calcination temperatures limit the materials that can be used as sorbents and lead to crack formation.
Innovation Solution
A carbon dioxide capture structure is developed using a sorbent material comprising a carbon-based sorbent material combined with an inorganic binder material, specifically potassium silicate. This structure is fabricated using a method that includes mixing the sorbent material, potassium silicate binder, and solvent to produce a sorbent mixture, building a three-dimensional porous monolith structure, and treating it to obtain the carbon dioxide capture product, all done at a maximum temperature of 150°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high calcination temperatures are used to enhance mechanical strength, then the mechanical strength of the monolith structure is improved, but crack formation occurs and the range of usable sorbent materials is limited
Solution Approach 1:
The patent changes the temperature parameter from traditional high calcination temperatures (typically >500°C) to low-temperature drying (≤150°C). This parameter change prevents crack formation while still achieving adequate mechanical strength through the potassium silicate binder system, which sets and gains strength at low temperatures rather than requiring high-temperature calcination.
Solution Approach 2:
The patent replaces the traditional calcination process with an alternative low-temperature drying process that achieves similar structural consolidation without the harmful effects of high temperature. The potassium silicate binder serves as a low-temperature analog to high-temperature ceramic binders, providing mechanical strength through a different mechanism that avoids crack formation.
2Quantity of substance
If liquid amine solutions are used for CO2 capture, then CO2 absorption capacity is achieved, but high energy consumption and solvent degradation occur
Solution Approach 1:
The patent replaces liquid amine absorption (chemical absorption requiring thermal regeneration) with solid-phase adsorption using activated carbon and potassium silicate. This substitution eliminates the need for high-energy thermal regeneration cycles, as adsorption can be reversed at much lower temperatures or through pressure swing, dramatically reducing energy consumption while maintaining CO2 capture capacity.
Solution Approach 2:
The patent uses a composite material system combining activated carbon (for CO2 adsorption capacity) with potassium silicate binder (for structural integrity and additional adsorption sites). This composite provides both high CO2 capture capacity and low energy regeneration requirements, overcoming the limitations of liquid amine systems.
3Quantity of substance
If liquid amine solutions are used for CO2 capture, then CO2 absorption is achieved, but thermal and oxidative solvent degradation and corrosion product formation occur
Solution Approach 1:
The patent replaces liquid amine solutions with solid-phase adsorbents (activated carbon and potassium silicate). This substitution eliminates all issues related to liquid solvent degradation, oxidative stability, and corrosion, as the solid materials are chemically stable and do not evaporate or degrade under operating conditions.
Solution Approach 2:
The patent uses stable, non-consumable solid adsorbent materials that do not degrade over time like liquid amines. The activated carbon and potassium silicate binder system provides long-term stability without forming corrosion products or requiring frequent replacement due to degradation.
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 use of potassium silicate as a binder significantly increases the CO2 adsorption capacity, with a potential increase of up to 5 times compared to the carbon-based sorbent material alone. The structure exhibits improved mechanical properties, robustness, and reliable adsorption properties even after successive adsorption/desorption cycles, while also reducing energy consumption and avoiding high-temperature calcination.
Implementation Method 1
The use of potassium silicate as a binder significantly increases the CO2 adsorption capacity
Implementation Method 2
a first material is a sorbent material comprising a carbon-based sorbent material
Implementation Method 3
treating it to obtain the carbon dioxide capture product, all done at a maximum temperature of 150°C
Data Source
AI summary
A carbon dioxide capture structure having a monolithic three-dimensional shape, the structure being porous with interconnected pores which are accessible from an exterior side of the structure. The structure is made of a building material including a first material and a second material. The first material is a sorbent material (e.g. functionalizable for carbon dioxide adsorption). The second material is a binder material including potassium silicate. The present disclosure also relates to a method of making the carbon dioxide structure and a method for removing carbon dioxide from a gas or fluid mixture.