Bridging the pressure gap in model systems for heterogeneous catalysis with high-pressure scanning tunneling microscopy
| Autor: | Erik Lægsgaard, Flemming Besenbacher, Ronnie T. Vang |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
catalysis
Hydrogen Scanning electron microscope stm pressure gap Analytical chemistry General Physics and Astronomy chemistry.chemical_element Heterogeneous catalysis Catalysis law.invention Adsorption chemistry law Physical and Theoretical Chemistry Scanning tunneling microscope Bimetallic strip Bar (unit) |
| Zdroj: | Vang, R T, Lægsgaard, E & Besenbacher, F 2007, ' Bridging the pressure gap in model systems for heterogeneous catalysis with high-pressure scanning tunneling microscopy ', Physical Chemistry Chemical Physics . |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/b703328c |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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