在流体化床中直接捕获空气时,用氧化捕获CO2的动力学
Bryan Kean Hong Ooi1, Ewa J Marek1
1Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, CambridgeCB3 0AS, U.K.
概括
这项研究研究了氧化物 (CaO) 碳化动力学在低二氧化碳度下,这与直接捕获空气有关. 蒸汽添加增加了碳化速率,但化学反应动力学最终限制了整体的二氧化碳捕获.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 大多数碳捕获研究都集中在高二氧化碳度上.
- 了解低二氧化碳度动力学对于直接捕获空气 (DAC) 技术至关重要.
- 氧化 (CaO) 是一种有前途的二氧化碳捕获材料.
研究的目的:
- 为了确定低部分压力CO2 (0.382.70体积%) 的CaO碳化运动.
- 为了评估蒸汽对CaO碳化速率的影响.
- 评估在接近平衡条件下现有的动力模型的适用性.
主要方法:
- 在400650°C的温度下,研究了SiO2的流体化床中的CaO碳化.
- 使用的低二氧化碳度的气体混合物,不包括动力分析的质量转移限制.
- 应用非线性回归来使实验数据与兰木尔-欣舍尔伍德速率表达式相匹配.
主要成果:
- 确定质量转移速率与低二氧化碳度的碳化速率相当.
- 观察到2体积%蒸汽的伪催化效应,增加碳化速率,在更高的温度下减小.
- 随着温度的增加,CaO碳化变化的反应顺序在0和1之间变化.
结论:
- 兰穆尔-欣舍尔伍德模型适应了近平衡条件,显示了温度依赖的反应顺序.
- 二氧化碳吸附和脱附接近平衡,缓慢的化学反应动力学主导了整体捕获.
- 蒸汽添加可以提高捕获率,但内在的化学动力学仍然是限制速度的步骤.
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