Oxygen-Isotope Exchange between CO2 and Solid Ti18O2
- 17 May 2011
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry C
- Vol. 115 (22), 11156-11162
- https://doi.org/10.1021/jp201935e
Abstract
The light–induced oxygen-isotope exchange between gaseous CO2 and solid Ti18O2 (anatase) and the spontaneous thermal isotope exchange that takes place between the vacuum-calcined solid Ti18O2 and CO2 were studied by gas-phase high-resolution Fourier transform infrared absorption spectroscopy over a period of several days. The absorption ro-vibrational 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 Ti18O2 solid and the oxygen related to the gaseous CO2. The C18O2 was formed as the dominating final product with a minor content of C16O18O. The rate of oxygen-isotope exchange is highly sensitive to the conditions of the titania pretreatment; vacuum-annealed Ti18O2 at 450 °C exhibited a very high spontaneous oxygen exchange activity with gaseous C16O2. A mechanism for the 18O/16O exchange process is discussed at the molecular level. The photocatalytic formation of methane, acetylene, and C16O released from the Ti18O2 surface was observed after irradiation by an excimer laser.This publication has 24 references indexed in Scilit:
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