Correlation between the surface configurations and hydrogenolysis: Aniline on the Pt(111) surface
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan, 48109-1055 (United States)
- Material Science and Engineering Laboratory, National Institute for Science and Technology, Gaitherburg, Maryland 20899 (United States)
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055 (United States)
A correlation has been developed between the structure of adsorbed reaction intermediates and their hydrogenolysis reactivity for aniline in hydrogen pressures up to 0.001 Torr on the Pt(111) surface. The composition and orientation of the species involved in aniline hydrogenolysis were characterized using temperature programmed reaction (TPR) and near edge x-ray absorption fine structure (NEXAFS) measurements. The benzene and ammonia formed by aniline hydrogenolysis during TPR on the Pt(111) surface increase substantially in the presence of hydrogen atmospheres. At reaction temperatures, the aromatic ring in aniline remains parallel to the surface in the presence of coadsorbed hydrogen, while in the absence of hydrogen the aromatic ring is tilted relative to the surface. This correlation between orientation and reactivity suggests that a parallel configuration may facilitate hydrogenolysis of the C--N bond in aniline. These [ital in] [ital situ] studies provide new insight into the structure of surface intermediates which may play a critical role in the mechanisms of aniline hydrogenolysis on the Pt(111) surface in 0.001 Torr of hydrogen.
- OSTI ID:
- 7174099
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (United States) Vol. 12:4; ISSN 0734-2101; ISSN JVTAD6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ABSORPTION
ADSORPTION
AMINES
ANILINE
AROMATICS
CATALYTIC EFFECTS
CHEMICAL BONDS
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
METALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
RADIATIONS
REACTIVITY
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS
X RADIATION