3D Printed Zeolite Monoliths for Dilute CO2 Capture
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Solution Overview
Problem
Current CO2 removal systems in enclosed environments, such as spacecraft and commercial buildings, face challenges with high energy intensity and particle attrition in fixed beds of adsorbent pellets, leading to health risks and inefficiencies, particularly in capturing ultra-dilute CO2 concentrations.
Innovation Solution
3D-printed zeolite monoliths with high zeolite content and optimized binder compositions, fabricated using layer-by-layer techniques, offering improved mechanical strength and CO2 adsorption capacity, reducing particle attrition and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed beds of adsorbent pellets are used for CO2 removal, then CO2 capture function is provided, but particle attrition occurs leading to health risks and system maintenance issues
Solution Approach 1:
The patent employs monolithic porous structures with controlled pore sizes and distributions to provide CO2 adsorption capacity while eliminating particle attrition. The monolith's continuous porous network allows gas flow through interconnected pores without particle breakdown, resolving the contradiction between providing adsorption function and avoiding harmful particle generation.
Solution Approach 2:
The patent uses composite monolithic structures combining support materials with adsorbent coatings or integrated adsorbent phases. This composite approach provides both mechanical strength to prevent structural failure and high surface area for CO2 adsorption, while maintaining a solid monolithic form that does not generate dust particles like pelletized adsorbents.
2Stress or pressure
If pelletization of adsorbent particles is performed to reduce flow resistance, then pressure drop is reduced, but mechanical strength decreases and attrition resistance is compromised
Solution Approach 1:
The monolithic porous structure provides optimized flow paths through controlled pore architecture, achieving low pressure drop without requiring pelletization. The continuous solid matrix maintains high mechanical strength while the porous network facilitates smooth gas flow, eliminating the need to compromise strength for flow resistance reduction.
Solution Approach 2:
The patent transitions from zero-dimensional particles to one-dimensional channel structures or three-dimensional monolithic networks, creating extended flow paths that reduce pressure drop while maintaining structural integrity. This dimensional transformation allows simultaneous optimization of flow characteristics and mechanical strength.
3Quantity of substance
If higher adsorbent content per unit volume is used to achieve higher uptake, then CO2 capture capacity increases, but mass transfer kinetics become slower due to limited accessibility
Solution Approach 1:
The monolithic structure incorporates hierarchical porosity with macro-, meso-, and micropores that facilitate rapid gas diffusion to adsorption sites throughout the monolith. This porous architecture enables high adsorbent loading while maintaining excellent mass transfer kinetics through optimized pore networks that prevent diffusion limitations.
Solution Approach 2:
The patent employs local optimization of pore sizes and distributions within different regions of the monolith, creating zones with tailored transport properties. This allows high adsorbent content in regions where mass transfer is optimized, achieving both high capacity and fast kinetics simultaneously through spatially differentiated structure design.
4Quantity of substance
If high cell density monoliths are fabricated to maximize adsorbent loading, then uptake capacity increases, but pressure drop through channels increases substantially
Solution Approach 1:
The monolithic structure uses optimized pore size distributions and channel geometries to maintain low pressure drop even at high cell densities. The porous network provides multiple parallel flow paths that reduce resistance, allowing maximization of adsorbent loading without substantial pressure drop increase through careful pore architecture design.
Solution Approach 2:
The patent extends the structure into the third dimension with optimized channel arrangements and pore networks that provide efficient flow distribution throughout the monolith volume. This three-dimensional optimization allows high cell density packing while maintaining low pressure drop through spatial distribution of flow paths.
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 3D-printed zeolite monoliths demonstrate enhanced mechanical stability and CO2 adsorption performance, effectively capturing CO2 from dilute concentrations with reduced energy requirements and minimized health risks, offering a more efficient and reliable CO2 removal solution.
Implementation Method 1
The removal of ultra-dilute CO2, such as ppm CO2 levels, from enclosed atmospheres is more challenging and energy-intensive than CO2 capture from other industrial gas streams in which CO2 concentration is typically above 5 vol. %.
Implementation Method 2
Some current systems for cabin CO2 removal utilize fixed beds of adsorbent pellets or beads. These adsorbents may be zeolite 13X or 5A molecular sieves which are commonly used as benchmark adsorbents for CO2 capture from flue gas streams.
Data Source
AI summary
Carbon dioxide (CO2) capture materials comprising one or more 3D-printed zeolite monoliths for the capture and or removal of CO2 from air or gases in enclosed compartments, including gases or mixtures of gases having less than about 5% CO2. Methods for preparing 3D-printed zeolite monoliths useful as CO2 capture materials and filters, as well as methods of removing CO2 from a gas or mixture of gases in an enclosed compartment using 3D-printed zeolite monoliths are provided.