The sticking probability for H-2 in presence of CO on some transition metals at a hydrogen pressure of 1 bar

Martin Johansson, Ole Lytken, Ib Chorkendorff

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The sticking probability for H-2 on Ni, Co, Cu, Rh, Ru, Pd, it and Pt metal films supported on graphite has been investigated in a gas mixture consisting of 10 ppm carbon monoxide in hydrogen at a total pressure of 1 bar in the temperature range 40-200 degrees C. Carbon monoxide inhibits the sticking probability significantly for all the metals, even at 200 degrees C. In the presence of 10 ppm CO, the sticking probability increases in the order It, 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 It. The high sensitivity to CO seen for It and Pt is explained by the fact that the difference in desorption energy for H and CO is largest for those metals. (C) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalSurface Science
Volume602
Issue number10
Pages (from-to)1863-1870
ISSN0039-6028
DOIs
Publication statusPublished - 2008

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