Predicting the Integral Heat of Adsorption for Gas Physisorption on Microporous and Mesoporous Adsorbents

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• 作者：Peter B. Whittaker ; Xiaolin Wang ; Wolfgang Zimmermann ; Klaus Regenauer-Lieb ; Hui Tong Chua
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 24, 2014
• 年：2014
• 卷：118
• 期：16
• 页码：8350-8358
• 全文大小：528K
• 年卷期：v.118,no.16(April 24, 2014)
• ISSN：1932-7455

文摘

We have developed two predictive methods for the heats of adsorption that stem from isotherm models and benchmarked them against the Clausius鈥揅lapeyron equation. These are the T贸th potential function model and the modified Clapeyron equation. Three adsorbate/adsorbent working pairs are used as examples: n-butane/BAX 1500 activated carbon, isobutane/BAX 1500 activated carbon, and ammonia/Fuji Davison type RD silica gel, all of which are examples of gas physisorption on adsorbents with both micro- and mesopores. Isotherms and corresponding integral heats of adsorption were measured in the range 298鈥?48 K. For n-butane and isobutane, the pressures were up to 235 kPa, and for ammonia, the pressures were up to 835 kPa. Our two predictive methods consistently offer significant improvements over the Clausius鈥揅lapeyron equation. Between the two predictive methods, the T贸th model is more robust across all three working pairs studied with predictions generally falling within 10鈥?5% of the values of the measured heats.