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

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Títol: KOH activation of carbon materials obtained from the pyrolysis of ethylene tar at different temperatures
Autors: Martinez-Escandell, Manuel | Castro, Mateus Carvalho Monteiro de | Molina Sabio, Miguel | Rodríguez Reinoso, Francisco
Grups d'investigació o GITE: Materiales Avanzados
Centre, Departament o Servei: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Paraules clau: Activated carbon | Mesophase pitch | Coke | Chemical activation | Petroleum residue
Àrees de coneixement: Química Inorgánica
Data de publicació: de febrer-2013
Editor: Elsevier
Citació bibliogràfica: Fuel Processing Technology. 2013, 106: 402-407. doi:10.1016/j.fuproc.2012.09.005
Resum: 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.
Patrocinadors: 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
Idioma: eng
Tipus: info:eu-repo/semantics/article
Revisió científica: si
Versió de l'editor: http://dx.doi.org/10.1016/j.fuproc.2012.09.005
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