Adsorption and reaction of formic acid on a pseudomorphic palladium monolayer on Mo(110)
- Texas A&M Univ., College Station, TX (United States)
The adsorption and reaction of formic acid, HCOOH, on monolayer and multilayer palladium supported on a Mo(110) surface have been studied using temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). On multilayer palladium, formic acid adsorbs molecularly at 100 K and desorbs primarily intact upon heating to 200 K. A small amount of the adsorbed formic acid in the first adsorbed layer undergoes decomposition to form CO, H{sub 2}O and H{sub 2}. No other surface reaction intermediates were identified using HREELS. In constrast to multilayer palladium, monolayer palladium exhibits a higher reactivity toward the decomposition of formic acid to form a surface formate species, as verified with HREELS. However, monolayer palladium shows a relatively low reactivity toward formate decomposition. The formate species is stable on the surface up to 350 K and exhibits an activation energy and preexponential factor for decomposition of 125 KJ/mol and 4.7 x 10{sup 18} respectively. Increasing the Pd thickness to three layers restores the bulk Pd surface chemistry of formic acid. 42 refs., 8 figs., 2 tabs.
- OSTI ID:
- 196637
- Journal Information:
- Journal of Physical Chemistry, Vol. 100, Issue 1; Other Information: PBD: 4 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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