KOH activation of carbon materials obtained from the pyrolysis of ethylene tar at different temperatures

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Title: KOH activation of carbon materials obtained from the pyrolysis of ethylene tar at different temperatures
Authors: Martinez-Escandell, Manuel | Castro, Mateus Carvalho Monteiro de | Molina Sabio, Miguel | Rodríguez Reinoso, Francisco
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Activated carbon | Mesophase pitch | Coke | Chemical activation | Petroleum residue
Knowledge Area: Química Inorgánica
Issue Date: Feb-2013
Publisher: Elsevier
Citation: Fuel Processing Technology. 2013, 106: 402-407. doi:10.1016/j.fuproc.2012.09.005
Abstract: A complete study of the importance of the pyrolysis temperature (up to 1500 °C) of a petroleum residue (ethylene tar) in the activation with KOH of the resultant pyrolysis products (covering from the own ethylene tar to pitches and well developed cokes) has been carried out. The trend in the porosity found for activated carbons is as follows: the pore volume increases with the pyrolysis temperature reaching a maximum value (1.39 cm3/g) at about 460 °C, just at the transition temperature between a fluid pitch and a solid coke. It is the pitch with highest mesophase content that develops the maximum porosity when activated with KOH. The amount of H2, CO and CO2 produced during the reaction of the mesophase pitch and coke with KOH has been quantified, and a trend as described for the pore volume was found with the pyrolysis temperature. Therefore, there is a relationship between the reactivity of the precursor with KOH and the porosity developed by the activated carbon. Since the reactions that produce H2 initiate at temperatures as low as 300 °C, it seems that KOH is modifying the conditions under which the pyrolysis occurs, and this fact is critical in the development of porosity.
Sponsor: This work was supported by the Ministerio de Ciencia e Innovación (Projects MAT2007‐61734 and PLE‐2009‐0052) and Generalitat Valenciana PROMETEO/2009/002.
URI: http://hdl.handle.net/10045/39539
ISSN: 0378-3820 (Print) | 1873-7188 (Online)
DOI: 10.1016/j.fuproc.2012.09.005
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.fuproc.2012.09.005
Appears in Collections:INV - LMA - Artículos de Revistas

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