Abstract
The ultrahigh vacuum temperature-programmed desorption of D 2 and CO from silica-supported Ru was studied. Features attributed to D 2 spillover were observed for doses at temperatures above 323 K. The CO desorption spectra were broad and indicated a very heterogeneous distribution of adsorption sites but no spillover. The desorption of predosed D 2 from coadsorbed D 2 + CO showed that CO displaces weakly bound D(a) causing the D 2 desorption peak to shift to higher temperatures. Preadsorbed D(a) caused no changes in the desorption of CO. A small amount of CD 4 desorbed when CO and D were coadsorbed. The potential catalytic role of the spillover D(a) is discussed.
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