Insight into hydroxides-activated coals: chemical or physical activation?

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Title: Insight into hydroxides-activated coals: chemical or physical activation?
Authors: Alcañiz-Monge, Juan | Illán-Gómez, María José
Research Group/s: Materiales Carbonosos y Medioambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: Activated carbon | Chemical activation | Thermal analysis | Microporosity
Knowledge Area: Química Inorgánica
Issue Date: 1-Feb-2008
Publisher: Elsevier
Citation: ALCAÑIZ MONGE, Juan; ILLÁN GÓMEZ, María José. "Insight into hydroxides-activated coals: chemical or physical activation?". Journal of Colloid and Interface Science. Vol. 318, Issue 1 (1 Febr. 2008). ISSN 0021-9797, pp. 35-41
Abstract: The objective of this paper is to get an insight into the chemical activation mechanism using KOH and NaOH as activated agents. Three coals have been selected as carbon precursors. It was found that KOH and NaOH develop a similar narrow microporosity, independently of the coal rank, whereas only KOH generates supermicroporosity. Temperature-programmed desorption experiments, carried out with impregnated anthracite, show differences on the gas evolved during the activated carbon preparation using the two activating agents. Thus, whereas hydrogen profiles are quite similar for both activated agents, the CO and H2O profiles are different. It is remarkable the high amount of H2O evolved at the maximum treatment temperature for both activating agents. The results obtained allow concluding that the chemical activation is due to a combination of different process driving the development of material porosity.
Sponsor: Spanish Government (project CTQ-2005-01358) and the GV (projects GV/2007/144 and ARVIV/2007/067).
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2007.10.017
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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