用于捕获CO2的Al2O3/MgO合剂,基于CaO的吸附剂:一项性能研究
Chengzhuang Zhang1,2, Jia Fang1,2,3, Xilong Xu1
1Key Laboratory of Fluid and Power Machinery, Ministry of Education, School of Energy and Power Engineering, Xihua University, Chengdu, China.
Annals of the New York Academy of Sciences
|August 27, 2025
概括
选择的前体和剂如Al2O3和MgO显著影响氧化
科学领域:
- 材料科学
- 化学工程
- 环境科学
背景情况:
- 氧化 (CaO) 对于循环过程中的二氧化碳捕获至关重要.
- 烧结和结构降解限制了基于CaO的吸附剂的循环稳定性和效率.
- 优化CaO吸收剂的性能需要仔细考虑前体选择和兴奋剂策略.
研究的目的:
- 研究不同前体对二氧化碳吸附性能的影响.
- 评估Al2O3和MgO兴奋剂对CaO吸收剂容量,动力学和循环稳定性的影响.
- 在基于CaO的二氧化碳吸附剂中开发一种脱吸附动力学和循环稳定性的策略.
主要方法:
- 四种前体的直接化:氧化,碳酸,单酸和商业碳酸.
- 系统地比较二氧化碳吸附性能,包括容量,动力学和多个吸附-脱附周期的周期稳定性.
- 使用技术来确定吸附剂的结构演变和理解吸附剂的作用.
主要成果:
- 氧化前体 (CaO-1) 显示出高初始二氧化碳吸附率 (0.63g/g),但由于烧结而导致循环稳定性较差 (10个循环后损失38%).
- 使用Al2O3 (CaO-Al2O3,95/5) 增强了容量 (0.65g/g) 和动力学 (0.23g/g·min-1),但仍表现出降解 (20次循环后33.8%).
- MgO合剂 (CaO-MgO,85/15) 提供了特殊的循环稳定性,在10个循环中保持了93%的容量,这归因于增强的烧结阻力.
结论:
- 前体工程和剂选择对于优化二氧化碳吸附动力学和循环稳定性之间的权衡至关重要.
- Al2O3注稳定了孔网,而MgO注保持了框架完整性,减轻了烧结.
- 采用最佳的CaO-Al2O3 (95/5) 和CaO-MgO (85/15) 组合的双剂方法为循环提供了具有成本效益和耐用性的二氧化碳吸附剂的有希望的策略.
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