TiO2 , oxygen vacancies

Aside from a first attempt to model isolated oxygen vacancies on TiO2(110) by a cluster model [153], more recent self-consistent works have considered large densities of vacancies, associated with (1 x 1) [142,143,146,156,161],... 

The extent of lattice oxygen incorporation into the decomposition products is linked to the surface redox properties of the oxide. Recent SSIMS and FT-RAIRS studies have provided initial evidence for the transient formation of oxygen vacancies on the surface of TiO2(110). Henderson has proposed that surface oxygen vacancies may explain the formation of trace amounts of formaldehyde from formic acid on Ti02(l 10) (figure 3) [41]. Both reactions (6) and (7) are proposed to occur below 500 K the water produced from formic acid exposure desorbed at 475 K, before the onset of formate decomposition to form CO. Formaldehyde and CO2 were produced in minor quantities relative to the production of CO [41]. Formaldehyde was formed from formic acid on reduced... 

Oxygen vacancy promoting catalytic dehydration of formic acid on TiO2(110) by in situ scanning tunneling microscopic observation. J. Phys. Chem. B, 109, 18831-18838. 

Kimmel GA, Petrik NG (2008) Tetraoxygen on reduced TiO2(110) oxygen adsorption and reactions with bridging oxygen vacancies. Phys Rev Lett 100 3937-3940... 

Epling WS, Peden CHF, Henderson MA et al (1998) Evidence for oxygen adatoms on TiO2(110) resulting from O2 dissociation at vacancy sites. Surf Sci 413 333-343... 

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