Physical Inorganic Chemistry
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ChemInform Abstract: Temperature-Programmed Desorption Study of H2-D2 Exchange on Pt(111) and the Role of Subsurface Sites.
First published: November 4, 1986
Abstract
No exchange is observed on the presaturated Pt surface below 120 K, while above 120 K two different exchange rates are obtained.
ChemInform Abstract
No exchange is observed on the presaturated Pt surface below 120 K, while above 120 K two different exchange rates are obtained. One is attributed to the recombination of D and H atoms at the surface and has an activation energy of 1.1 kcal mol-1. The other is assigned to the recombination involving at least one subsurface H or D atom and has an activation energy of 1.6 kcal mol-1. The subsurface site is located at an elevated potential beneath the Pt surface and H atoms can tunnel through or cross over to it more readily than D atoms.
