THERMAL DESORPTION OF FREE RADICALS FROM CATALYST SURFACES DETECTED BY LASER-INDUCED FLUORESCENCE
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Date
1980
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Ohio State University
Abstract
OH($^{2}\pi$)was detected in the dissociative adsorption of $H_{2} O$ on polycrystalline Pt above $550^{\circ} C$. The flux of thermally desorbed OH from Pt was measured as a function of Pt temperature, $H_{2} O$ pressure, and added $H_{2}, D_{2}$ and $O_{2}$ partial pressures. The observations support the following mechanism:\begin{eqnarray} && H_{2}O + 2^{*} \rightarrow OH^{*} + H^{*} \\ && HO^{*} + ^{*} \rightarrow H^{*} + O^{*}\\ && HO^{*} \rightarrow OH + ^{*},\end{eqnarray} Where $""{^{*}}""$ represents an active catalyst site. The activation energy for reaction (3) was measured to be $30 \pm 1$ kcal/mole.
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$^{\ddag}$NRL/NRC Postdoctoral Associate, 1978-80.
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