Calorimetric investigation of adsorption of organic compounds by active carbons

• Published in: Journal of thermal analysis and calorimetry Vol. 54; no. 1; pp. 333 - 342
• Main Authors: ULBIG, P, SURYA-LUKITO, SCHULZ, S, SEIPPEL, J
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Dordrecht Springer 1998; Springer Nature B.V
• Subjects: Activated carbon; Alkanes; Calorimeters; Chemistry; Enthalpy; Exact sciences and technology; General and physical chemistry; Heterogeneity; Homology; Isooctane; Lignite; Methylcyclohexane; Organic compounds; Solid-liquid interface; Surface physical chemistry; Wetting; Liquid solid interface; Adsorption; Hydrocarbon; Wetting; Organic adsorbate; Activated carbon; Enthalpy; Alkane; Surface properties; Alcohol; Thermodynamic properties
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1023/A:1010126631971

Enthalpies of wetting of two active carbons and one brown coal coke by several pure liquids (mainly homologous series) were measured at 298.15 K with two quasi-isothermal microcalorimeters. Different measuring cells with cavities of about 0.5 and 15 cm3 were used. The advantage of the larger measuring cell with three independent 15 cm3 cavities is the higher mass of active carbon, leading to a high reproducibility with standard deviations below 1% and a reduced measuring time. Experiments were carried out with n-alkanes, l-alkanols, cycloalkanes and isomers thereof, i.e. 2-propanol, methylcyclohexane, 2,2,4-trimethylpentane (isooctane and 2-ethyl-1-hexanol, and water. Like the polarity, the size and the three-dimensional expansion of the molecules, the energetic and geometric heterogeneity of the adsorbent influences the enthalpy of wetting.