Impact of the carbonisation temperature on the activation of carbon fibres and their application for hydrogen storage

Special issue: 2nd World Congress of Young Scientists on Hydrogen Energy Systems.Porous materials are gaining interest due to their potential for storing hydrogen via physisorption. In the present work, two carbon fibres, carbonised at 973 and 1273 K, have been chemically activated with KOH and NaOH, in order to obtain materials with optimised characteristics for hydrogen storage application. Highly microporous activated carbon fibres were obtained from both precursors, especially from the fibre carbonised at the lower carbonisation temperature, remarking its importance on its subsequent activation process. As activation agent, KOH is more effective for developing the narrow microporosity, and higher yields are obtained. H2 adsorption isotherms were measured at 298 K for pressures up to 20 MPa, and at 77 K up to 4 MPa. The maximum excess adsorption of hydrogen reached 1 wt% at 298 K and 3.8 wt% at 77 K. The total volumetric storage capacity is of 17 g/l at 298 K, and 32 g/l at 77 K.Financial help from the European Union (Marie Curie Research Training Network—HyTRAIN Project reference:512443), MEC (Accion complementaria; ENE2005-23824-E/CON), the Generalitat Valenciana (Accion complementaria; ACOMP06/089) and MEC-CTQ2006-08958PPQ. Samples supplied by Osaka gas Co., Ltd

Carbonaceous adsorbents for NH3 removal at room temperature

3 pages, 2 figures, 1 table.-- Available online Oct 26, 2007.The use of activated carbons (ACs) for environmental applications is widening as new challenges emerge. In recent years, for example, particular attention has been focused on ammonia abatement at room temperature. This particular interest is closely related to odour control issues. NH3 is frequently present in odorous emissions from a variety of industries, such as wastewater treatment plants.This work was partially funded by the Ministerio de Medio Ambiente, (Projects Ref. 4.4-154/2005/2-B and Ref. 219/2006/1-4.4) and by MEC (CTM2005-07524-C02-00 and CTQ2005-01358/PPQ). One of the authors (A.R.) thanks Universitat de Girona for a Predoctoral Grant.Peer reviewe

Carbonaceous adsorbents for NH3 removal at room temperature

3 pages, 2 figures, 1 table.-- Available online Oct 26, 2007.The use of activated carbons (ACs) for environmental applications is widening as new challenges emerge. In recent years, for example, particular attention has been focused on ammonia abatement at room temperature. This particular interest is closely related to odour control issues. NH3 is frequently present in odorous emissions from a variety of industries, such as wastewater treatment plants.This work was partially funded by the Ministerio de Medio Ambiente, (Projects Ref. 4.4-154/2005/2-B and Ref. 219/2006/1-4.4) and by MEC (CTM2005-07524-C02-00 and CTQ2005-01358/PPQ). One of the authors (A.R.) thanks Universitat de Girona for a Predoctoral Grant.Peer reviewe