The effect of the activating agent and temperature on the porosity development of physically activated coal chars

E. Arenas, F. Chejne

    Research output: Contribution to journalArticleResearchpeer-review

    64 Scopus citations

    Abstract

    An experimental work on the influence of temperature and the activating agent on the development of surface area and porosity for activated carbons was carried out. Three coals from different regions of Colombia were activated with CO2, steam and a CO2-steam mixture. Coal from the Antioquia Region (La Capotera) was activated with a CO2-steam mixture at 1073, 1123 and 1173 K and with CO2 and steam at 1073 K. Other two coals from Antioquia and Cesar regions (La Grande and Borrego) regions were activated with a CO2-steam mixture at 1073 K and these were compared with the La Capotera char for the same conditions. The content of ash was confirmed to affect the development of surface area: coals with lower amount of ash developed higher specific surface areas. Activation temperature also affected the development of surface area: the use of high temperature produced low surface areas. Results indicate that CO2-steam produces larger surface areas than CO2 and steam alone, and reactions with CO 2-steam and CO2 develop a more uniform porosity than reaction with steam. The pore sizes are larger when steam is used and smaller when CO2 is used.

    Original languageEnglish
    Pages (from-to)2451-2455
    Number of pages5
    JournalCarbon
    Volume42
    Issue number12-13
    DOIs
    StatePublished - 2004

    Bibliographical note

    Funding Information:
    Authors wish thanks to Colciencias and Minercol their financial support. Also, authors thank Professor Ljubisa Radovic for his valuable comments, Ms. Diana Lopez for her collaboration in writing this paper and to Mr. Carlos Londoño, Mr Carlos Alzate, Mr Wilmar Morales, Ms. Magdalena Giraldo and Mr. Whady Florez for their collaboration during the experimental job.

    Keywords

    • A. Activated carbon
    • B. Activation, Carbonization
    • C. Adsorption

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