Predicting the Integral Heat of Adsorption for Gas Physisorption on Microporous and Mesoporous Adsorbents
| Autor: | Wolfgang Zimmermann, Peter B. Whittaker, Klaus Regenauer-Lieb, Hui Tong Chua, Xiaolin Wang |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Thermodynamics
02 engineering and technology Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Isothermal process 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Adsorption Clausius–Clapeyron relation Physisorption chemistry Isobutane medicine Physical and Theoretical Chemistry 0210 nano-technology Mesoporous material Activated carbon medicine.drug |
| Zdroj: | The Journal of Physical Chemistry C. 118:8350-8358 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp410873v |
| Popis: | We have developed two predictive methods for the heats of adsorption that stem from isotherm models and benchmarked them against the Clausius–Clapeyron equation. These are the Toth 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 298–348 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–Clapeyron equation. Between the two predictive methods, the Toth model is more robust across all three working pairs studied with predictions generally falling within 10–15% of the values of the measured heats. |
| Databáze: | OpenAIRE |
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