Adsorption and Desorption of Carbon Dioxide onto and from Activated Carbon at High Pressures

• Published in: Industrial & engineering chemistry research Vol. 36; no. 7; pp. 2808 - 2815
• Main Authors: Chen, Jeng Hsin, Wong, David Shan Hill, Tan, Chung Sung, Subramanian, Ramkumar, Lira, Carl T, Orth, Matthias
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.07.1997
• Subjects: Adsorption; Applied sciences; Chemical engineering; Exact sciences and technology; Inorganic adsorbate; Gas solid adsorption; Activated carbon; Gas solid desorption; Carbon dioxide; Adsorption isotherm; Desorption isotherm; Inorganic adsorbent; Experimental study; Modeling; High pressure
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/ie960227w

Adsorption of carbon dioxide near its critical point on DeGussa IV activated carbon is investigated in this study. A volumetric method was used to measure the adsorption/desorption isotherms at 284, 300, 305, 310, and 314 K over a large pressure range. At subcritical temperatures, adsorption isotherms display a discontinuity at the vapor pressure of carbon dioxide, and desorption hysteresis is observed. However, there is no desorption hysteresis if adsorption is terminated before vapor−liquid transition occurs. At supercritical temperatures, adsorption isotherms display a plateau, and the excess decreases beyond the critical pressure. No hysteresis occurs during the desorption process. The adsorption isotherms can be represented very well by the simplified local density model.