| Título: | Insight into hydroxides-activated coals: chemical or physical activation? |
| Autores: |
Alcañiz Monge, Juan Illán Gómez, María José |
| Fecha: |
2008-10-23 2008-10-23 2008-02-01 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/article |
| Tema: |
Activated carbon Chemical activation Thermal analysis Microporosity Química Inorgánica |
| Descripción: |
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. Spanish Government (project CTQ-2005-01358) and the GV (projects GV/2007/144 and ARVIV/2007/067). |
| Idioma: | Inglés |
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