Bridging the pressure gap: In situ atomic-level investigations of model platinum catalyst surfaces under reaction conditions by scanning tunneling microscopy

Thesis/Dissertation · Sun May 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10192508· OSTI ID:10192508

McIntyre, Brian James ^[1]

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1. Univ. of California, Berkeley, CA (United States)

Results of this thesis show that STM measurements can provide information about the surfaces and their adsorbates. Stability of Pt(110) under high pressures of H₂, O₂, and CO was studied (Chap. 4). In situ UHV and high vacuum experiments were carried out for sulfur on Pt(111) (Chap.5). STM studies of CO/S/Pt(111) in high CO pressures showed that the Pt substrate undergoes a stacking-fault-domain reconstruction involving periodic transitions from fcc to hcp stacking of top-layer atoms (Chap.6). In Chap.7, the stability of propylene on Pt(111) and the decomposition products were studied in situ with the HPSTM. Finally, in Chap.8, results are presented which show how the Pt tip of the HPSTM was used to locally rehydrogenate and oxidize carbonaceous clusters deposited on the Pt(111) surface; the Pt tip acted as a catalyst after activation by short voltage pulses.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 10192508
• Report Number(s): LBL--36065; ON: DE95002346
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
ADSORPTION
CARBON MONOXIDE
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
DECOMPOSITION
MICROSCOPY
PLATINUM
PROPYLENE
SORPTIVE PROPERTIES
STRUCTURE AND PHASE STUDIES
SULFUR
SURFACE PROPERTIES
TUNNEL EFFECT
USES