Spillover of deuterium on Pt/TiO/sub 2/. 2. Sequential H/sub 2/-D/sub 2/ exposure and effects of oxygen

Journal Article · Thu Jun 21 04:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150657a020· OSTI ID:6455241

Beck, D D; Bawagan, A O; White, J M

The adsorption and spillover of hydrogen on Pt/TiO/sub 2/ have been carried out by using temperature-programmed desorption (TPD) in an ultrahigh-vacuum system. Sequential dosing of hydrogen isotopes at temperatures between 200 and 500 K results in variable isotope exchange, with the desorption for H/sub 2/ and D/sub 2/ reversed with respect to the dose sequence. This is interpreted in terms of spillover from Pt onto TiO/sub 2/ sites. High-temperature oxidation confirms the presence of an intermediate state in the spillover mechanism. Oxygen titration experiments, coupled with the desorption of sequentially dosed isotopes, indicate that desorption of spillover deuterium proceeds by a mechanism involving surface migration back to Pt sites rather than recombination and desorption directly from the oxide. 22 references, 6 figures, 2 tables.

• Research Organization: Univ. of Texas, Austin
• OSTI ID: 6455241
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:13; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
DATA
DEUTERIUM
EXPERIMENTAL DATA
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
STABLE ISOTOPES