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Chromatographia

, Volume 14, Issue 9, pp 524–528 | Cite as

Preparation and modification of complex pyrolytic carbon-silica adsorbents

  • R. Leboda
Originals

Summary

The surface properties of complex adsorbents prepared through the pyrolysis of dichloromethane on the surface of silica gel were investigated. The reaction was carried out in a specially constructed reactor at 400–500°C. The construction and performance of the reactor are described. The modification of the silica gel surface by pyrogenic carbon results in its chemical but not energetical homogeneity. Such adsorbents usually show strong adsorptive properties which limits their use in chromatography. A simple method of homogenizing the porous structure and energetic properties of the adsorptive centers of such adsorbents is presented. The method consists of an additional pyrolysis of an alcohol or other substances on the surface of the carbon-silica adsorbent. Such reactions were carried out under both static and dynamic conditions. The properties of the modified adsorbent depend on the reaction conditions and on the type of the additionally pyrolysed substance.

Key Words

Silica gel-modification Carbon-silica adsorbents Surface properties Dichloromethane pyrolysis 

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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1981

Authors and Affiliations

  • R. Leboda
    • 1
  1. 1.Department of Physical Chemistry, Institute of ChemistryMaria Curie-Skłodowska UniversityLublinPoland

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