519.Measuring adsorption isotherms with a flowmeter and a pressure gauge ：Observations on the quasi-equilibrium method
519.Measuring adsorption isotherms with a flowmeter and a pressure gauge ：Observations on the quasi-equilibrium method
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519.用流量计和压力计测量吸附等温线：准平衡法的观察
DOI：
10.1007/s10450-019-00068-8
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发表时间：
2019
期刊：
影响因子：
3.3
通讯作者：
K. Kaneko
中科院分区：
文献类型：
--
作者：
F. Vallejos-Burgos;K. Kaneko
我们重新审视准平衡吸附法作为一种廉价的替代商业容积装置测量气体吸附等温线。该方法基于当引入吸附气体时，包含样品的歧管的压力如何作为时间的函数增加。我们表明，在某些条件下，它是没有必要采用超低流速（即低于几厘米3/小时），以获得可靠的吸附等温线。此外，我们表明，通过时间微分的质量平衡方程，它是可能的，直接获得和测量的吸附速率。这些新的见解提供了一个低成本和简单的方法来测量吸附平衡和速率。
We revisit the quasi-equilibrium adsorption method as an inexpensive alternative to commercial volumetric apparatus for the measurement of gas adsorption isotherms. This method is based on how the pressure of a manifold containing the sample increases as a function of time when an adsorbing gas is introduced. We show that, under certain conditions, it is not necessary to employ ultra-low flow rates (i.e. below few cm3/h) to obtain reliable adsorption isotherms. Also, we show that by time-differentiating the mass balance equation, it is possible to obtain and measure directly the rates of adsorption. These new insights provide a low-cost and simple approach to the measurements of both adsorption equilibrium and rates.