Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels
[EN] Resorcinol–formaldehyde organic xerogels with an initial pH of 6.5 were synthesized in a microwave oven and then carbonised in a furnace. The influence of the carbonisation temperature, heating rate and the particle size of the organic xerogels upon the pore structure of the carbon xerogels was assessed. The textural properties of the organic and carbon xerogels were evaluated from N2 adsorption–desorption isotherms at −196 °C and by measuring the true (helium) density. As the carbonisation temperature increased from 700 to 950 °C the SBET of the carbon xerogels decreased from 585 to 471 m2 g−1 for the carbon xerogels derived from the organic xerogels crushed to a particle size >212 μm. A decrease in the particle size to dp < 212 μm caused an increase in the BET specific surface area of the carbon xerogels of between 12 and 27% but also a decrease of the carbon xerogel yield of between 15 and 24%, depending on the carbonisation temperature. The pore structure of the carbon xerogels did not change significantly with the increase in the heating rate in the carbonisation process over the interval studied.
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2013-03
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Subjects: | Carbon xerogels, Carbonisation, Textural properties, Pore structure, |
Online Access: | http://hdl.handle.net/10261/78055 |
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dig-incar-es-10261-780552018-10-05T09:38:22Z Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels Hernández Moreno, Ángel Salvador Arenillas de la Puente, Ana Gómez Calvo, Esther Bermúdez Menéndez, José Miguel Menéndez Díaz, José Ángel Carbon xerogels Carbonisation Textural properties Pore structure [EN] Resorcinol–formaldehyde organic xerogels with an initial pH of 6.5 were synthesized in a microwave oven and then carbonised in a furnace. The influence of the carbonisation temperature, heating rate and the particle size of the organic xerogels upon the pore structure of the carbon xerogels was assessed. The textural properties of the organic and carbon xerogels were evaluated from N2 adsorption–desorption isotherms at −196 °C and by measuring the true (helium) density. As the carbonisation temperature increased from 700 to 950 °C the SBET of the carbon xerogels decreased from 585 to 471 m2 g−1 for the carbon xerogels derived from the organic xerogels crushed to a particle size >212 μm. A decrease in the particle size to dp < 212 μm caused an increase in the BET specific surface area of the carbon xerogels of between 12 and 27% but also a decrease of the carbon xerogel yield of between 15 and 24%, depending on the carbonisation temperature. The pore structure of the carbon xerogels did not change significantly with the increase in the heating rate in the carbonisation process over the interval studied. Financial support from the Ministerio de Economía y Competitividad (Ref. MAT2011-23733) is greatly acknowledged. A.H. Moreno and E.G. Calvo are also grateful to FICYT for their postdoctoral and predoctoral research grant, respectively Peer reviewed 2013-06-13T08:14:21Z 2013-06-13T08:14:21Z 2013-03 artículo http://purl.org/coar/resource_type/c_6501 Journal of Analytical and Applied Pyrolysis 88: 111-116 (2013) 0165-2370 http://hdl.handle.net/10261/78055 10.1016/j.jaap.2012.12.004 en http://dx.doi.org/10.1016/j.jaap.2012.12.004 open Elsevier |
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Carbon xerogels Carbonisation Textural properties Pore structure Carbon xerogels Carbonisation Textural properties Pore structure Hernández Moreno, Ángel Salvador Arenillas de la Puente, Ana Gómez Calvo, Esther Bermúdez Menéndez, José Miguel Menéndez Díaz, José Ángel Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
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[EN] Resorcinol–formaldehyde organic xerogels with an initial pH of 6.5 were synthesized in a microwave oven and then carbonised in a furnace. The influence of the carbonisation temperature, heating rate and the particle size of the organic xerogels upon the pore structure of the carbon xerogels was assessed. The textural properties of the organic and carbon xerogels were evaluated from N2 adsorption–desorption isotherms at −196 °C and by measuring the true (helium) density. As the carbonisation temperature increased from 700 to 950 °C the SBET of the carbon xerogels decreased from 585 to 471 m2 g−1 for the carbon xerogels derived from the organic xerogels crushed to a particle size >212 μm. A decrease in the particle size to dp < 212 μm caused an increase in the BET specific surface area of the carbon xerogels of between 12 and 27% but also a decrease of the carbon xerogel yield of between 15 and 24%, depending on the carbonisation temperature. The pore structure of the carbon xerogels did not change significantly with the increase in the heating rate in the carbonisation process over the interval studied. |
format |
artículo |
topic_facet |
Carbon xerogels Carbonisation Textural properties Pore structure |
author |
Hernández Moreno, Ángel Salvador Arenillas de la Puente, Ana Gómez Calvo, Esther Bermúdez Menéndez, José Miguel Menéndez Díaz, José Ángel |
author_facet |
Hernández Moreno, Ángel Salvador Arenillas de la Puente, Ana Gómez Calvo, Esther Bermúdez Menéndez, José Miguel Menéndez Díaz, José Ángel |
author_sort |
Hernández Moreno, Ángel Salvador |
title |
Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
title_short |
Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
title_full |
Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
title_fullStr |
Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
title_full_unstemmed |
Carbonisation of resorcinol–formaldehyde organic xerogels: Effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
title_sort |
carbonisation of resorcinol–formaldehyde organic xerogels: effect of temperature, particle size and heating rate on the porosity of carbon xerogels |
publisher |
Elsevier |
publishDate |
2013-03 |
url |
http://hdl.handle.net/10261/78055 |
work_keys_str_mv |
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