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Porosity development along the synthesis of carbon from metal carbides
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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2008 (English)In: Microporous and Mesoporous Materials, ISSN 1387-1811, Vol. 113, no 1-3, 14-21 p.Article in journal (Refereed) Published
Abstract [en]

Carbide derived carbons (CDCs) are materials containing a wide range of pore size, their properties and applications being a function of the pore structure. For this reason it is important to find the relationship between synthesis parameters, such as initial carbide and temperature, and resulting structure. In this work, CDCs were prepared from VC, TiC, WC, TaC, NbC, HfC and ZrC at different temperatures and they have been characterized by means of gas adsorption. Nitrogen at −196 °C and carbon dioxide at 0 °C adsorptions were used to obtain structural information such as apparent surface area (SBET), micropore volume (Vmicro) and pore size distribution (PSD). These studies show that these parameters vary strongly depending on synthesis temperature (700–1200 °C) and initial carbide. Since the size of micropores is near the range suggested as being ideal for methane (CH4) storage, the high-pressure methane adsorption at 25 °C was performed to check the possible use of CDCs as storage material. The CH4 adsorption capacity of CDCs can compete with other carbons on a gravimetric basis, though the volumetric one is far from desired due to their low packing density.

Place, publisher, year, edition, pages
2008. Vol. 113, no 1-3, 14-21 p.
Keyword [en]
Carbon derived carbon, N2 adsorption, CO2 adsorption, Methane capacity
National Category
Chemical Sciences
URN: urn:nbn:se:su:diva-24744DOI: 10.1016/j.micromeso.2007.10.046ISI: 000257362100003OAI: diva2:198238
Available from: 2008-03-13 Created: 2008-03-13 Last updated: 2011-05-16Bibliographically approved
In thesis
1. Synthesis and Characterisation of Carbide Derived Carbons
Open this publication in new window or tab >>Synthesis and Characterisation of Carbide Derived Carbons
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Carbide derived carbons (CDCs) have been synthesised through chlorination of VC, TiC, WC, TaC, NbC, HfC and ZrC at different temperatures. The aim of the investigation was to systematically study changes of structural and adsorption properties depending on the synthesis conditions. CDCs were characterised using nitrogen and carbon dioxide adsorption, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and electron energy loss spectroscopy. The studies revealed the CDCs structures to range from amorphous to ordered, from microporous to mesoporous. It was found that structural ordering and porosity can be modified by: i) synthesis temperature, ii) precursor, iii) density and volume of precursor, iv) catalysts, v) incorporation of nitrogen in to carbide structure, and CDCs can be tuned up to the demanded quality. They also exhibited a high potential for methane storage.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. 82 p.
Carbide derived carbons, Gas adsorption, EELS, Raman, Porous carbons
National Category
Chemical Sciences
Research subject
Structural Chemistry
urn:nbn:se:su:diva-7423 (URN)978-91-7155-589-2 (ISBN)
Public defence
2008-04-16, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Available from: 2008-03-13 Created: 2008-03-13Bibliographically approved

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Svensson, Gunnar
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Department of Physical, Inorganic and Structural Chemistry
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