Porous Structure of Activated Carbons and Tert-butylbenzene Breakthrough Dynamics

• Published in: Journal of colloid and interface science 2002-06, Vol.250 (1), p.5-17
• Main Authors: Palijczuk, D., Gun'ko, V.M., Leboda, R., Skubiszewska-Zięba, J., Ziętek, S.
• Format: Article
• Language: English
• Subjects: activated carbons; adsorbed water; adsorption energy distribution; benzene adsorption; breakthrough dynamics; breakthrough time; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; nitrogen adsorption; pore size distribution; Porous materials; tert-butylbenzene adsorption
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1006/jcis.2002.8318

The structural and adsorptive characteristics of six activated carbons were studied by means of nitrogen and benzene adsorption and water desorption. Tert-butylbenzene (TBB) breakthrough dynamics was analyzed by using several integral equations solved with a regularization/singular-value decomposition procedure. TBB interaction with texturally different activated carbons with the presence of preadsorbed or adsorbed water under dynamic conditions was illustrated by the breakthrough plots handled with several models. The influence of the type of activated carbons, their pore size distributions, water vapor, and TBB flow rate on the breakthrough times (tb) and the dynamic capacity of the carbon beds has been explored with better results for a carbon sample possessing a maximal contribution of mesopores at half-width x>1.5 nm among the carbons studied (which also appears on benzene adsorption) and a major contribution of microporocity as VDS/Vp≈0.88 and SK/SBET≈0.15. Another adsorbent, which is characterized by a similar total porosity but a larger micropore volume, a smaller contribution of mesopores (SK/SBET≈0.08), greater total and miroporous specific surface areas, and greater intensity of the pore size distribution at x