Spontaneous oxygen isotope exchange between carbon dioxide and\nnatural clays: Refined rate constants referenced to TiO2 (anatase/rutile)

0466724 - ÚFCH JH 2018 RIV NL eng J - Journal Article
Knížek, Antonín - Zukalová, Markéta - Kavan, Ladislav - Zukal, Arnošt - Kubelík, Petr - Rojík, P. - Skřehot, P. - Ferus, Martin - Civiš, Svatopluk
Spontaneous oxygen isotope exchange between carbon dioxide and
natural clays: Refined rate constants referenced to TiO2 (anatase/rutile).
Applied Clay Science. Roč. 137, MAR 2017 (2017), s. 6-10. ISSN 0169-1317. E-ISSN 1872-9053
R&D Projects: GA MŠMT LD14115; GA ČR(CZ) GA14-12010S; GA ČR GA13-07724S; GA MŠMT(CZ) LM2015073
Institutional support: RVO:61388955
Keywords : clay * carbon dioxide * FTIR spectroscopy
OECD category: Physical chemistry
Impact factor: 3.641, year: 2017

In a series of our previously published papers, we reported a broad range of experiments and theoretical studies devoted to the interaction of carbon dioxide with the anatase titania surface. In the current study, we demonstrate oxygen mobility between gaseous carbon dioxide and solid natural clay minerals. This surprising feature implies that such behaviour is typical not only for titania but also for oxides with different chemical composition and structure. The oxygen mobility was demonstrated by the interaction of isotopically labelled carbon dioxide – C18O2 – with the mineral surfaces. In most cases, we observed rapid oxygen exchange between the gas and the mineral. It was therefore discovered that carbon dioxide is more active than was previously thought because it exchanges its oxygen atoms with inorganic surfaces. Moreover, this feature seems to be very significant in natural clays of various compositions. This finding points not only towards high activity of CO2 but also towards high surface reactivity of clays, which are quite common surface minerals on Earth and other planets.
Permanent Link: http://hdl.handle.net/11104/0264965