A comparison of physical activation of carbon xerogels with carbon dioxide with chemical activation using hydroxides

Autor:	Angélique Léonard, Silvia Blacher, L. Zubizarreta, María S. Contreras, Jean-Paul Pirard, Claudio Olivera-Fuentes, Nathalie Job, Carlos A. Páez, Ana Arenillas
Rok vydání:	2010
Předmět:	Chemistry Inorganic chemistry chemistry.chemical_element General Chemistry Microporous material Resorcinol chemistry.chemical_compound Volume (thermodynamics) Specific surface area Carbon dioxide medicine General Materials Science Sodium carbonate Carbon Activated carbon medicine.drug
Zdroj:	Carbon. 48:3157-3168
ISSN:	0008-6223
DOI:	10.1016/j.carbon.2010.04.054
Popis:	Carbon xerogels synthesized with a fixed resorcinol/sodium carbonate molar ratio (R/C) were physically activated using CO2. The effect of activation temperature and activation time on the final properties of the activated carbon xerogels was evaluated. The specific surface area increases from ∼600 m2 g−1 to 2000 m2 g−1 and more by increasing the temperature and duration of the activation step. A comparison between physical activation with CO2 and chemical activation with hydroxides was also performed: it was found that both processes produce an increase of the micropore volume and specific surface area without altering the mesoporosity developed during the synthesis. However, chemical activation can lead to the development of the narrow microporosity mainly whereas, in physical activation, the widening of the narrow micropores takes place whatever the process conditions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5b91ae56dca24ce6d475de0fa04cb2f8 https://doi.org/10.1016/j.carbon.2010.04.054 Zobrazit plný text záznamu Full Text from ScienceDirect