The Isotopic Exchange Reaction of Oxygen on Metal Oxides

Measurement of the surface-growth kinetics of reducedTiO2(110)during reoxidation using time-resolved scanning tunneling microscopy

“…Often isotopic exchange reactions of oxygen gas molecules with surface atoms are used to investigate the kinetics of activation on metal oxide surfaces. 18 Typically three exchange processes are encountered, denoted by R 0 , R 1 , or R 2 , where the superscript indicates the number of surface oxygen atoms involved, which are described by the following equations:…”

Comparative studies in subsolidus areas of ternary oxide systems PbO–V2O5–In2O3 and PbO–V2O5–Fe2O3

“…The presented results as well as the results of the earlier studies on the system Pb 2 V 2 O 7 -FeVO 4 [9,10] and literature data according to the system Fe 2 O 3 -V 2 O 5 [11,27], allowed a preliminary dividing of the part of the subsolidus area of the system PbO-V 2 O 5 -Fe 2 O 3 into partial ternary systems. The proposed division did not embrace the [11].…”

Surface oxygen dynamics and H2 oxidation on cobalt spinel surface probed by 18O/16O isotopic exchange and accounted for by DFT molecular modeling: facile interfacial oxygen atoms flipping through transient peroxy intermediate

“…In such experiments it is possible to differentiate between surface exchange, bulk diffusion, and fast diffusion along grain boundaries [18]. From the course of the oxygen exchange reaction, the way in which oxygen takes place in the catalytic processes may also be deduced [19]. Following pioneering work by Klier et al [20], there are three conceivable parallel pathways for an oxygen molecule to exchange the atoms with the catalyst surface (i) exchange proceeds without direct involvement of lattice oxygen (R 0 ), (ii) only one of the atoms of a molecule is replaced (R 1 ), (iii) both atoms of a single dioxygen molecule are exchanged by lattice oxygens (R 2 ).…”