Abstract A novel method to estimate mass transfer kinetics in porous adsorbents using gas adsorption microcalorimetry is described. By fitting an appropriate model to experimental microcalorimetric peaks, both the LDF constant and the effective diffusion time constant could be estimated. Results are shown for an activated carbon and zeolite 13X. The experimental apparatus consisting of a microcalorimeter coupled to a controlled gas dosing system was described in the model by four control volumes: the dosing vessel, the dead volume, the measuring cell and the composite wall surrounding the cell. The proposed model was able to accurately describe the microcalorimetric peaks obtained upon each gas injection. The sensitivity of the model solution to the diffusion parameters was analyzed and adequate ranges of experimental conditions allowing for accurate parameter estimation could be determined. Mass transfer parameters found by this technique are in agreement with those reported in the literature by other experimental techniques.

中文翻译：

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使用气体吸附微量热法评估多孔吸附剂的传质速率

摘要 描述了一种使用气体吸附微量热法估计多孔吸附剂中传质动力学的新方法。通过将合适的模型拟合到实验微量热峰，可以估计 LDF 常数和有效扩散时间常数。显示了活性炭和沸石 13X 的结果。由与受控气体计量系统耦合的微量热计组成的实验装置在模型中通过四个控制体积进行描述：计量容器、死体积、测量单元和单元周围的复合壁。所提出的模型能够准确描述每次注入气体时获得的微量热峰。分析了模型解对扩散参数的敏感性，并且可以确定允许准确参数估计的适当的实验条件范围。该技术发现的传质参数与其他实验技术在文献中报道的参数一致。