Catalysis in Industry

, Volume 5, Issue 4, pp 350–357 | Cite as

Porous carbon-silica composites and carbon materials from rice husk: Production technology, texture, and dispersity

  • Yu. V. LarichevEmail author
  • P. M. Eletskii
  • F. V. Tuzikov
  • V. A. Yakovlev


A method based on carbonization in a fluidized-bed catalytic reactor is suggested for utilization of rice husks, which are hard-to-recycle waste from paddy production. The bottom ash resulting from carbonization at 465–600°C is a carbon-silica nanocomposite (C/SiO2) with a SiO2 content of 58.7–81.8 wt % and a specific surface area of S BET = 152–232 m2/g. Leaching of SiO2 with hydrofluoric acid yields porous carbon materials with a specific surface area of 165–494 m2/g and a SiO2 content of <1%. These materials have been characterized by small-angle X-ray scattering (SAXS), transmission electron microscopy, and X-ray diffraction. Particle size data for SiO2 in the carbon-silica nanocomposite have been obtained for the first time. As the carbonization temperature is raised from 465 to 600°C, the average particle size of silica increases from 5.5 to 8.1 nm. Development of the SAXS procedure for determining the size of silica particles in the carbon matrix would provide a promising tool for knowingly designing porous carbon materials with preset properties. The carbonization of rice husks in a fluidized catalyst bed is among the most promising methods of their conversion into C/SiO2 nanocomposites and porous carbon materials with the use of template synthesis approaches.


SAXS rice husks fluidized bed carbon materials carbon-mineral composites 


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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • Yu. V. Larichev
    • 1
    Email author
  • P. M. Eletskii
    • 1
  • F. V. Tuzikov
    • 1
  • V. A. Yakovlev
    • 1
  1. 1.Boreskov Institute of Catalysis, Siberian BranchRussian Academy of SciencesNovosibirskRussia

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