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- W2006069907 abstract "Abstract The flash desorption of water and of formic acid and the flash decomposition of formic acid isotopes were studied on a clean Ni(110) surface for adsorption temperatures below −55 °C. Most of the adsorbed water was found to be weakly bound to the surface and to desorb with first-order kinetics. An apparent surface phase transition was observed at high coverages which indicated interactions between adsorbed water molecules at high coverage. A fraction of the formic acid adsorbed at −60 °C was very weakly bound to the surface and exhibited first-order desorption with a coverage-dependent activation energy. This coverage dependence was attributed to strong adsorbate-adsorbate interactions. The decomposition products for adsorption of a formic acid isotope, HCOOD, were H2, CO2, CO, and D2O. The water product observed leaving the surface was formed from the acid hydrogens and was the result of a decomposition-limited reaction step. The kinetics to form water, which were zero order at high coverage and first order at low coverage, were explained in terms of an island mechanism in which formic acid adsorbed in a condensed phase. The decomposition to form CO2 and H2 proceeded at a faster rate than that observed from adsorption at 37 °C. Also, the CO2 and H2 did not exhibit the narrow autocatalytic flash desorption peaks observed following 37 °C adsorption. The same kinetic mechanism was operating at both adsorption temperatures but for low temperature adsorption the bare metal sites needed for reaction were created by desorption of the water product and thus the rate was faster at the lower adsorption temperature. For −60 °C adsorption, all the CO product was desorption-limited." @default.
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- W2006069907 date "1978-01-01" @default.
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- W2006069907 title "The desorption kinetics of water and formic acid from Ni(110) following low-temperature adsorption" @default.
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- W2006069907 doi "https://doi.org/10.1016/0021-9517(78)90237-3" @default.
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