Počet záznamů: 1  

Spontaneous and Photoinduced Conversion of CO2 on TiO2 Anatase (001)/(101) Surfaces

  1. 1. 0437179 - UFCH-W 2015 RIV US eng J - Článek v odborném periodiku
    Ferus, Martin - Kavan, Ladislav - Zukalová, Markéta - Zukal, Arnošt - Klementová, Mariana - Civiš, Svatopluk
    Spontaneous and Photoinduced Conversion of CO2 on TiO2 Anatase (001)/(101) Surfaces.
    Journal of Physical Chemistry C. Roč. 118, č. 46 (2014), s. 26845-26850 ISSN 1932-7447
    Grant CEP: GA ČR(CZ) GAP108/12/0814; GA MŠk LD14115; GA MŠk(CZ) LD13060
    Grant ostatní:COST(XE) CM1104
    Institucionální podpora: RVO:61388955 ; RVO:61388980 ; RVO:68081707
    Klíčová slova: TiO2 * FT-IR spectroscopy * nanocrystalline anatase
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 4.772, rok: 2014

    High-resolution FT-IR spectroscopy was used to study the kinetics of oxygen mobility between gaseous isotopically labeled C18O2 and solid phase Ti16O2 nanocrystalline anatase (001). Analysis of the isotopic composition of the gases produced has revealed that anatase (001) calcinated at temperatures under 500 °C is a very weakly reactive material and exhibits a low exchange mobility of oxygen atoms between the gas phase molecules of CO2 and the TiO2 lattice. Isotope exchange is blocked by both residual HF adsorbed onto the TiO2 surface and TiOF2 impurities. The presence of TiOF2 was shown by TEM and X-ray diffraction. However, the anatase (001) sample became slightly active after annealing at temperatures higher than 500 °C and upon UV illumination. Nevertheless, the effective rate constant is still 3.45 times lower than that observed for the spontaneous exchange between C18O2 and anatase (101) material calcinated at 500 °C.
    Trvalý link: http://hdl.handle.net/11104/0240741