A Critical Study of the Use of the Iodine Number in the Characterization of Activated Carbons

Möller, Martin; Treese, Julian; Pasel, Christoph; Bathen, Dieter

doi:10.1002/cite.201300108

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…According to the quoted guideline it is assumed that at a residual concentration of 0.02 N a monomolecular layer of iodine molecules has formed on the adsorbent surface and provides an indication of the inner surface of the activated carbon. Own investigations showed that this equilibrium concentration is not yet in the range of saturation for many coals [88]. It was also found that there is only a small difference between the iodine numbers of different activated carbons, which makes it difficult to evaluate the adsorption properties.…”

Section: Adsorptive Propertiesmentioning

confidence: 99%

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

et al. 2019

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Activated carbons are widely used as commercial adsorbents. Thermal or chemical activation creates a pore system and functional groups on the inner surface which may significantly change adsorption properties. Therefore, in addition to knowledge of the structural properties, a sound understanding of surface chemistry is indispensable. This paper summarizes the state of art as well as new developments in both fields. Standardized methods for characterizing structural properties are volumetric measurements and mercury porosimetry. To get a more detailed insight into the region of micropores, a probe molecule method was developed. For characterization of surface chemistry, methods such as IR spectroscopy, temperature-programmed desorption, and Boehm titration are subject of research. Novel methods were developed such as measuring of excess isotherms and calorimetric measurement of heat of adsorption, which are presented and discussed in greater detail in this paper. As each single method can only provide limited information, a better description of surface chemistry requires combination and careful interpretation of complementary information from different methods. Property Standard Limitation Apparent density ASTM D 2854-09 Total ash content ASTM D 2866-11 Moisture ASTM D 2867-17 Ball-pan hardness ASTM D 3802-16 pH-value ASTM D 3838-05 Electrical conductivity ASTM D 1125-14 Water soluble components ASTM D 5029-98 Volatile matter content ASTM D 5832-98 Acid extractable content ASTM D 6385-99 Particle size distribution ASTM D 2862-16 granular activated carbon ASTM D 5158-98 powdered activated carbon Ignition temperature ASTM D 3466-06 granular activated carbon Dusting attrition ASTM D 5159-04 granular activated carbon www.ChemBioEngRev.de

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Section: Adsorptive Propertiesmentioning

confidence: 99%

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

et al. 2019

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Ein neuer Ansatz zur Charakterisierung der Flüssigphasenadsorption an Aktivkohlen

Treese

Pasel

Luckas

et al. 2015

Chemie Ingenieur Technik

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Aktivkohlen sind industriell häufig eingesetzte Adsorbentien. Die Charakterisierung ihrer Oberflächeneigenschaften bereitet jedoch aufgrund der Vielzahl an Rohstoffen und Herstellungsvarianten Probleme. Hier wird eine Modellvorstellung zur Beschreibung der Oberfläche hergeleitet, die auf der Kenntnis der wesentlichen chemischen Wechselwirkungen auf Aktivkohleoberflächen basiert, die bereits erforscht wurden. An verschiedenen Aktivkohlen werden Adsorptionsisothermen ausgesuchter Probemoleküle vermessen und mit den Daten überprüft, inwiefern das Modell zur Bewertung der Oberflächenchemie von Aktivkohlen geeignet ist.

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A Critical Study of the Use of the Iodine Number in the Characterization of Activated Carbons

Cited by 2 publications

References 9 publications

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

Ein neuer Ansatz zur Charakterisierung der Flüssigphasenadsorption an Aktivkohlen

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