Compositions for co2 separation from high temperature effluents
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Solution Overview
Problem
Existing lithium zirconate (LZO) compositions face challenges in mechanical robustness, durability, and dimensional stability during CO2 sorption and thermal cycling, limiting their practical implementation in high-temperature CO2 separation processes.
Innovation Solution
Combining LZO with ceramic binders or polyhedral oligomeric silsesquioxane (POSS) micro-aggregates to form dense, cohered structures that enhance mechanical properties and maintain CO2 absorption performance, including the use of potassium carbonate and zirconium oxide formulations with Bisque Fix (BF) to create moldable pastes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pure lithium zirconate (LZO) is used for CO2 separation, then high CO2 selectivity is achieved, but mechanical robustness and fracture toughness are poor
Solution Approach 1:
The patent combines lithium zirconate (LZO) with alumina-silica ceramic binder to form a composite material. The LZO provides high CO2 selectivity through chemisorption, while the alumina-silica binder contributes mechanical strength and structural integrity. This composite approach resolves the contradiction by integrating materials with complementary properties, allowing the sorbent to maintain both high CO2 separation performance and sufficient mechanical robustness for practical applications.
2Shape
If pure LZO solid bodies are compressed under high pressure, then solid forms are obtained, but cohesion and fracture toughness remain poor
Solution Approach 1:
The invention creates a composite where LZO particles are embedded in an alumina-silica binder matrix. The binder material provides cohesive bonding between LZO particles, significantly improving the fracture toughness and mechanical strength of the compressed solid bodies. This composite structure allows the material to maintain its shape under compression while achieving the necessary cohesion for durable operation.
3Productivity
If LZO undergoes CO2 sorption and thermal cycling, then CO2 capture and regeneration are achieved, but volumetric dimensional changes occur
Solution Approach 1:
The patent modifies the physical and chemical parameters of the LZO material by incorporating it into an alumina-silica binder matrix and subjecting it to specific sintering conditions. This parameter change approach stabilizes the volumetric dimensions during CO2 sorption and thermal cycling, while preserving the chemisorption mechanism that enables CO2 capture and regeneration. The binder matrix constrains dimensional changes that would otherwise occur in pure LZO.
4Strength
If ceramic binders are added to LZO to improve mechanical properties, then strength and cohesion are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes a porous alumina-silica binder material that can be incorporated into LZO through relatively simple mixing and sintering processes. The porous structure of the binder facilitates CO2 diffusion while providing mechanical support. This approach enhances mechanical strength without significantly complicating the manufacturing process, as the binder materials are commonly available and the processing conditions are compatible with existing ceramic fabrication techniques.
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 compositions exhibit significantly enhanced mechanical properties and CO2 absorption rates, up to 6 times higher than pure LZO, suitable for industrial applications in carbon capture and hydrogen production.
Implementation Method 1
LZO has shown promise as a solid-state sorbent for CO2 separation via capture and regeneration due to its high selectivity for CO2. This selectivity arises from a chemisorption equilibrium reaction between CO2 and LZO, yielding lithium carbonate (Li2CO3) and zirconium oxide (ZrO2)
Implementation Method 2
LZO powder is blended with ceramic binders (e.g., alumina oxide, silicon dioxide, zirconium oxide, among others), enabling the creation of durable solid bodies through compression molding and heat treatment
Implementation Method 3
enabling the creation of durable solid bodies through compression molding and heat treatment
Data Source
AI summary
The present disclosure provides improved compositions and methods for creating robust lithium zirconate-based solid-state compositions with enhanced mechanical properties and CO2 separation performance. These compositions address the longstanding challenges of poor cohesion, dimensional instability, and durability that have limited the practical implementation of lithium zirconate in industrial CO2 separation processes. By enabling the practical use of high-temperature CO2 separation compositions, the present disclosure contributes to the technical field of carbon capture and climate change mitigation.