动态中间温度CO2的吸附性能K2CO3的吸附性能-促进层层的双氧化物衍生吸附剂
Ruotong Li1,2, Xixuan Hu1,2, Liang Huang1,2
1Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Molecules (Basel, Switzerland)
|March 28, 2024
概括
碳酸促进的层状双氧化物 (LDH) 显示了增强的二氧化碳捕获. 在动态吸附试验中,无机的离子间接的LDH表现优越,用于有效的碳捕获.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 层状双氧化物 (LDH) 是碳捕获的有希望的材料.
- 碳酸 (K2CO3) 的提升可以增强LDHs的吸附性质.
- 了解动态吸附特性对于实际的二氧化碳封存应用至关重要.
研究的目的:
- 为了研究K2CO3促进的LDHs的动态吸附特征,用于二氧化碳封存.
- 为了在不同的条件下比较有机和无机合的K2CO3/MgAl-LDH吸附剂的性能.
- 确定最佳的吸附剂成分和结构,以有效的中温二氧化碳捕获.
主要方法:
- 制备MgAl-LDH,K2CO3/MgAl-LDH和K2CO3/MgAl-LDH (C16) 具有不同的K2CO3负载.
- 使用X射线衍射,布鲁努埃尔-埃梅特-泰勒,扫描电子显微镜和里埃变换红外光谱学进行了表征.
- 热重力测量和固定床动态CO2吸附试验.
主要成果:
- 提升K2CO3显著增强了MgAl-LDH的吸附特性.
- 12.5重量% K2CO3/MgAl-LDH ((C16) 与有机离子间隔显示在 350°C 和 100% CO2 的热重力测试中具有最佳容量 (1.12 mmol/g).
- 在低度CO2的动态突破性试验中,K2CO3/MgAl-LDH与无机离子间隔的25重% K2CO3/MgAl-LDH表现出优异的性能 (透时间为93.1秒,容量为0.722 mmol/g).
结论:
- 这项研究揭示了K2CO3促进的LDHs的热重度计和动态吸附结果之间的差异.
- 在动态的,低度的二氧化碳捕获场景中,无机离子交叉的K2CO3/MgAl-LDH表现出更快的动力学和更好的性能.
- 与有机交叉对应物相比,K2CO3修饰的无机阴离子交叉的LDH显示出更大的实际二氧化碳封存应用潜力.
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