Analysis of CO2 kinetics in Na,Cs-Rho crystals using the zero length column: a case study for slow systems
Analysis of CO2 kinetics in Na,Cs-Rho crystals using the zero length column: a case study for slow systems
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使用零长度色谱柱分析 Na,Cs-Rho 晶体中的 CO2 动力学：慢速系统的案例研究
DOI：
10.1007/s43153-021-00155-w
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发表时间：
2021
影响因子：
1.2
通讯作者：
Mangano E
中科院分区：
文献类型：
--
作者：
Mangano E
与测量非常快的系统相比，对具有缓慢气体传输动力学的系统的实验测量通常被认为是一项相对容易的任务。另一方面，当运输过程朝着几个小时量级的时间常数前进时，不仅是测量，而且数据的分析和解释都带来了挑战，使得对该过程的正确时间常数的评估变得非同小可。在这项工作中，我们使用零长柱(ZLC)技术测量了二氧化碳在Na，Cs-Rho晶体中的扩散，作为使用该技术进行非常缓慢的吸附过程的案例研究。该体系的时间常数约为8h，通过对ZLC解吸曲线的分析，表明了使用部分负载法确定明确的时间常数的重要性。传统的分析是通过使用非线性ZLC模型来改进的，以考虑导致浓度依赖的扩散系数的等温线非线性。最后，利用Cavalcante提出的方法确定了系统的三维扩散路径。
Experimental measurements of systems with slow gas transport kinetics are generally considered a relatively easier task when compared to the challenges of measurements of very fast systems. On the other hand, when the transport process goes towards time constants of the order of several hours, not only the measurements, but also the analysis and interpretation of the data offer challenges which make the assessment of the correct time constant of the process non trivial. In this work we used the measurements of CO2diffusion in Na,Cs-Rho crystals, carried out using the zero length column (ZLC) technique, as a case study for the use of the technique for very slow adsorption processes. The system, which has a time constant of the order of 8 h, shows the importance of using the partial loading approach for the determination of an unambiguous time constant from the analysis of the ZLC desorption curves. The traditional analysis is refined by using the nonlinear ZLC model to take into account the isotherm nonlinearity that results in a concentration dependent diffusivity. Finally, the method proposed by Cavalcante is used to confirm the 3-D diffusion path of the system.