Journal of Sol-Gel Science and Technology

, Volume 48, Issue 1–2, pp 224–230 | Cite as

Reactivity of CO2 traps in aerogel–wollastonite composites

  • Alberto Santos
  • Mohamed Ajbary
  • José A. Toledo-Fernández
  • Víctor Morales-Flόrez
  • Abdelhak Kherbeche
  • Luis Esquivias
Original Paper

Abstract

Synthetic wollastonite has been used as the active phase embedded into two different silica aerogel composites. These composites are different in respect of the route used for the synthesis of the wollastonite powder. Texture and composition of both types of composite have been characterized. In addition, several factors (pH, reaction time, CO2 saturation, etc.) that could help to optimize the carbonation process at room temperature and pressure have been studied. Under the same conditions, both composites confirm previous results showing efficiencies as CO2 sequesters between 80% and 100% in only 15 min of gas flow. The textural characteristics of the aerogel, together with the grain size of the synthetic wollastonite powder, not only increase the speed of the reaction, but also inhibit the appearance of a passivating layer on the surface of the wollastonite grains attacked by the CO2. This is an outstanding feature as it insists on a cutting-edge challenge of the CO2 research: its economical availability.

Keywords

Aerogel Wollastonite CO2 sequestration Passivating layer Carbonation Porous matrix 

Notes

Acknowledgments

The authors are grateful to the Consejería de Innovación Ciencia y Empresa of the Junta de Andalucía (Spain), Agencia Española de Cooperación Internacional and the Spanish Ministerio de Medio Ambiente, for supporting this work with the Projects TEP790, AECI A/5575/06 and A266/2007/3-11.1, respectively.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Alberto Santos
    • 1
  • Mohamed Ajbary
    • 2
  • José A. Toledo-Fernández
    • 2
  • Víctor Morales-Flόrez
    • 3
  • Abdelhak Kherbeche
    • 4
  • Luis Esquivias
    • 3
  1. 1.Departamento de Ciencias de la TierraCASEM, Universidad de CádizCadizSpain
  2. 2.Departamento de Física de la Materia Condensada, Facultad de CienciasUniversidad de CádizCadizSpain
  3. 3.Departamento de Física de la Materia Condensada, Facultad de FísicaInstituto de Ciencias de Materiales de Sevilla (CSIC), Universidad de SevillaSevillaSpain
  4. 4.Université Sidi Mohamed Ben Abdellah, Ecole Supérieure de TechnologieFesMaroc

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