The sticking probability for H2 in presence of CO on some transition metals at a hydrogen pressure of 1bar

The sticking probability for H2 on Ni, Co, Cu, Rh, Ru, Pd, Ir and Pt metal films supported on graphite has been investigated in a gas mixture consisting of 10ppm carbon monoxide in hydrogen at a total pressure of 1bar in the temperature range 40–200°C. Carbon monoxide inhibits the sticking probabili...

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Bibliographic Details
Published in:Surface science 2008-05, Vol.602 (10), p.1863-1870
Main Authors: Johansson, M., Lytken, O., Chorkendorff, I.
Format: Article
Language:English
Subjects:
Cobalt
Hydrogen
Iridium
Nickel
Palladium
Platinum
Rhodium
Ruthenium
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Summary:The sticking probability for H2 on Ni, Co, Cu, Rh, Ru, Pd, Ir and Pt metal films supported on graphite has been investigated in a gas mixture consisting of 10ppm carbon monoxide in hydrogen at a total pressure of 1bar in the temperature range 40–200°C. Carbon monoxide inhibits the sticking probability significantly for all the metals, even at 200°C. In the presence of 10ppm CO, the sticking probability increases in the order Ir, Pt, Ni, Co, Pd, Rh, Ru, whereas for Cu, it is below the detection limit of the measurement, even in pure H2. The sticking probability for H2 in presence of CO relative to its value in pure hydrogen is largest for Pd and smallest for Pt and Ir. The high sensitivity to CO seen for Ir and Pt is explained by the fact that the difference in desorption energy for H and CO is largest for those metals.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2008.03.025