Počet záznamů: 1

High-temperature growth of anatase on kaolinite substrate

  1. 1.
    0358031 - UACH-T 2011 RIV GB eng J - Článek v odborném periodiku
    Rieder, M. - Klementová, Mariana - Szatmáry, Lórant
    High-temperature growth of anatase on kaolinite substrate.
    Proceedings of the Royal Society A-Mathematical Physical and Engineering Sciences. Roč. 466, č. 2115 (2010), s. 721-730 ISSN 1364-5021
    Výzkumný záměr: CEZ:AV0Z40320502
    Klíčová slova: TiO2 * kaolinite * metastability * photocatalytic activity * X-ray powder diffraction
    Kód oboru RIV: CA - Anorganická chemie
    Impakt faktor: 1.672, rok: 2010

    When a fine fraction of kaolinite (less than 2 mu m) is mixed with titanyl sulphate (weight ratio approx. 1 : 7), hydrolysed, washed, dried and heated to temperatures between 750 and 900 degrees C, it transforms into metakaolin, and titania crystallizes as anatase with a small particle size (approx. 20-30 nm). In parallel experiments with plain titania (without kaolinite), rutile is the sole product phase at 850 and 900 degrees C and the dominant phase in a mixture with anatase at 750 degrees C. The particle sizes are much larger (approx. 400-1100 nm). It appears that kaolinite is instrumental in preserving titania in the anatase form and with a small particle size even at fairly high temperatures and hindering its transformation to rutile. However, this anatase exhibits poor photocatalytic activity.
    Trvalý link: http://hdl.handle.net/11104/0196177