Calcium Looping Sorbent Stabilization via Metal Oxide Supports
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Solution Overview
Problem
Calcium-based sorbents used in calcium looping for carbon capture experience a significant drop in activity and CO2 uptake capacity due to sintering at high temperatures, limiting their effectiveness in cyclic operations.
Innovation Solution
Incorporating metal oxide supports with high Tammann temperatures, such as ZrO2, into the sorbent structure to stabilize CaO and prevent sintering, along with a scalable production method involving solution combustion synthesis and spheronization to create stable, high-capacity CO2 sorbents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If natural limestone sorbents are used for carbon capture, then cost and availability are improved, but activity stability and CO2 uptake capacity deteriorate due to excessive loss during cyclic operations
Solution Approach 1:
The patent applies composite materials by combining CaO with metal oxide supports (such as perovskite structures like CaZrO3, CaMgO3, or CaAlO3) to create a composite sorbent. This composite structure maintains the low cost and availability of calcium-based materials while the metal oxide support prevents sintering and structural degradation during cyclic carbonation-calcination operations, thereby improving activity stability and CO2 uptake capacity retention.
2Productivity
If calcium-based sorbents are used in high temperature calcium looping, then CO2 capture functionality is achieved, but sintering occurs leading to activity drop
Solution Approach 1:
The patent uses metal oxide supports (perovskite structures) as an intermediary material that mediates between the CaO active sites and the harsh high-temperature environment. These supports have high thermal stability and act as a structural framework that prevents CaO particles from sintering together, thereby maintaining both CO2 capture functionality and structural stability during calcium looping operations.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and chemical parameters of the sorbent structure through the formation of perovskite phases. The metal oxide support changes the thermal and structural parameters of the composite material, raising the sintering temperature and maintaining pore structure integrity at high operating temperatures, thus preserving both functionality and stability.
3Duration of action of moving object
If multiple cycles of carbonation and calcination are performed, then CO2 capture capacity is achieved, but sorbent activity decreases due to sintering
Solution Approach 1:
The patent applies beforehand cushioning by incorporating metal oxide supports into the sorbent structure prior to cyclic operations. These supports pre-establish a thermally stable framework that cushions against the damaging effects of repeated heating and cooling cycles, preventing sintering and maintaining CO2 uptake capacity throughout the duration of multiple carbonation-calcination cycles.
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 resulting sorbents exhibit enhanced stability and CO2 uptake capacity over multiple cycles, maintaining performance under industrially relevant conditions and facilitating large-scale application in calcium looping processes.
Implementation Method 1
Incorporating metal oxide supports with high Tammann temperatures, such as ZrO2, into the sorbent structure to stabilize CaO and prevent sintering
Implementation Method 2
capture CO2 efficiently through multiple cycles of carbonation and calcination
Implementation Method 3
capture CO2 efficiently through multiple cycles of carbonation and calcination
Data Source
AI summary
The present disclosure provides CO2 sorbent materials and methods of producing the same. The method includes: (a) combining calcium, at least one metal, and a fuel in a solvent to form a solution; (b) heating the solution formed in (a) to evaporate the solvent and form a combustion mixture; (c) heating the combustion mixture formed in (b) to combustion, to form a combusted material; and (d) calcinating the combusted material formed in (c) to form the CO2 sorbent. The CO2 sorbent may be used for capturing CO2, such as in a calcium looping process.