States of surface hydrogen under reaction conditions of the Fischer-Tropsch synthesis
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説明
The reaction of hydrogen with Fe surfaces was observed by the ellipsometric method at 77 K to 500 ° C under H2 pressures of 10−3 Torr (0.1 Pa) to 500 Torr (7×104 Pa). The ellipsometric analysis reveals no existence of adsorbed hydrogen on the surface above 400 °C; hydrogen seems to be alternatively absorbed into the subsurface region of two to three atomic layers. It is concluded that the subsurface hydrogen is specific to the high temperature and the high pressure owing to strained and roughened Fe surfaces as well as the equilibrium with gas phase hydrogen. Absence of adsorbed hydrogen is indicated as well in the ellipsometric response to the hydrogenation reaction of surface carbon species on Fe surfaces.
収録刊行物
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- Catalysis Letters
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Catalysis Letters 7 15-25, 1991-01-01
Springer Science and Business Media LLC
