✦ LIBER ✦

Hydroxyl radical desorption from polycrystalline palladium: evidence for a surface phase transition

✍ Scribed by Louis C. Anderson; Charles E. Mooney; Jack H. Lunsford

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 318 KB
Volume: 196
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85718-p

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✦ Synopsis

The desotption of hydroxyl radicals, as detected by laser-induced fluorescence, during the reaction of H2 and O2 over polycrystalline palladium has been studied as a function of temperature and 0z/H2 ratio. The apparent activation energy for OH desorption shows a discontinuity at z 1210-1220 K for 0z/H2 ratios>4. This abrupt change in E. is taken as evidence that a phase transition, possibly involving the decomposition of a two-dimensional PdO phase, has occurred in the surface region.