High pressure STM studies

HIGH PRESSURE STM STUDIES OF SUPPORTED GOLD CLUSTERS... 

High pressure STM studies of supported gold clusters 399... 

Surface Mobility of Atoms and Molecules Studied with High-Pressure STM... 

These systematic studies suggest that an intrinsic connection between the adsorbate structure, mobility, and the formation of product can be established with the aid of structural information obtained from high-pressure STM. It further demonstrated the importance of STM in studies of heterogeneous catalysis at high pressure. 

High-pressure STM apparatuses are now available in a few laboratories. This allows one to scrutinize the low-temperature results, identify new, ordered adsorbate structures, and study activated processes such as adsorbate-induced, surface reconstruction, and reactions that only occur in the presence of adsorbates at high... 

The high pressure STM was also used to study the structure of a Pt(lll) model catalyst surface during the thermal decomposition of propylene. Carbonaceous clusters were produced by partial dehydrogenation and polymerization of the hydrocarbon. Finally, SFG revealed new CO species in CO oxidation and provided strong evidence for their active role for oxidation to CO,. 

Recently, in situ studies of catalytic surface chemical reactions at high pressures have been undertaken [46, 47]. These studies employed sum frequency generation (SFG) and STM in order to probe the surfaces as the reactions are occurring under conditions similar to those employed for industrial catalysis (SFG is a laser-based teclmique that is described in section A 1.7.5.5 and section BT22). These studies have shown that the highly stable adsorbate sites that are probed under vacuum conditions are not necessarily tlie same sites that are active in high-pressure catalysis. Instead, less stable sites that are only occupied at high pressures are often responsible for catalysis. Because the active... 

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