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Issue 27, 2007
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Bridging the pressure gap in model systems for heterogeneous catalysis with high-pressure scanning tunneling microscopy

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Abstract

A high-pressure scanning tunneling microscope (HP-STM) enabling imaging with atomic resolution over the entire pressure range from ultrahigh vacuum (UHV) to one bar has been developed. By means of this HP-STM we have studied the adsorption of hydrogen on Cu(110), CO on Pt(110) and Pt(111), and NO on Pd(111) at high pressures. For all of these adsorption systems we find that the adsorption structures formed at high pressures are identical to high-coverage structures formed at lower pressures and temperatures. We thus conclude that for these systems the so-called pressure gap can be bridged, i.e. the results obtained under conventional surface science conditions can be extrapolated to higher pressures. Finally, we use the HP-STM to image the CO-induced phase separation of a Au/Ni(111) surface alloy in real time, whereby demonstrating the importance of catalyst stability in the study of bimetallic systems.

Graphical abstract: Bridging the pressure gap in model systems for heterogeneous catalysis with high-pressure scanning tunneling microscopy

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Publication details

The article was received on 05 Mar 2007, accepted on 19 Apr 2007 and first published on 14 May 2007


Article type: Invited Article
DOI: 10.1039/B703328C
Citation: Phys. Chem. Chem. Phys., 2007,9, 3460-3469
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    Bridging the pressure gap in model systems for heterogeneous catalysis with high-pressure scanning tunneling microscopy

    R. T. Vang, E. Lægsgaard and F. Besenbacher, Phys. Chem. Chem. Phys., 2007, 9, 3460
    DOI: 10.1039/B703328C

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