Oxygen-Isotope Exchange between CO2 and Solid Ti18O2

0360347 - ÚFCH JH 2012 RIV US eng J - Journal Article
Civiš, Svatopluk - Ferus, Martin - Kubát, Pavel - Zukalová, Markéta - Kavan, Ladislav
Oxygen-Isotope Exchange between CO2 and Solid Ti18O2.
Journal of Physical Chemistry C. Roč. 115, č. 22 (2011), s. 11156-11162. ISSN 1932-7447. E-ISSN 1932-7455
R&D Projects: GA AV ČR IAAX00100903; GA AV ČR IAA400400804; GA AV ČR IAA400400705; GA AV ČR KAN200100801; GA ČR GAP208/10/1678; GA ČR GAP208/10/2302; GA MŠMT LC510; GA MŠMT OC09044
Grant - others:COST(XE) MP0702; EC 7th FP project SANS(XE) NMP-246124
Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z10100523
Keywords : carbon dioxide * titanium dioxide * surface
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.805, year: 2011

The light-induced oxygen-isotope exchange between gaseous CO2 and solid (TiO2)-O-18 (anatase) and the spontaneous thermal isotope exchange that takes place between the vacuum-calcined solid (TiO2)-O-18 and CO2 were studied by gas-phase high-resolution Fourier transform infrared absorption spectroscopy over a period of several days. The absorption rovibrational spectra of all the measured carbon dioxide isotopologues were assigned and served as the quantification of the time-dependent isotope exchange between the oxygen atoms from the (TiO2)-O-18 solid and the oxygen related to the gaseous CO2. The (CO2)-O-18 was formed as the dominating final product with a minor content of (COO)-O-16-O-18. The rate of oxygen-isotope exchange is highly sensitive to the conditions of the titania pretreatment; vacuum-annealed (TiO2)-O-18 at 450 degrees C exhibited a very high spontaneous oxygen exchange activity with gaseous (CO2)-O-16.
Permanent Link: http://hdl.handle.net/11104/0197920