Surface structure and temperature dependence of light-alkane skeletal rearrangement reactions catalyzed over platinum single-crystal surfaces

Journal Article · Wed Dec 29 04:00:00 EST 1982 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00390a011· OSTI ID:6204195

Davis, S M ^[1]; Zaera, F; Somorjai, G A

---

1. Univ. of California, Berkeley

The structure sensitivity of isobutane, n-butane, and neopentane hydrogenolysis and isomerization catalyzed over a series of flat, stepped, and kinked platinum single-crystal surfaces was investigated near atmospheric pressure and at 540 to 640/sup 0/K. The atomic structure and surface composition of the active catalyst were determined before and after reaction studies by using low-energy electron diffraction and Auger electron spectroscopy. Catalytic activities for butane isomerization and consecutive rearrangement reactions were maximized on platinum surfaces with high concentrations of (100) microfacets. Maximum rates for the competing hydrogenolysis reactions were obtained on platinum surfaces that contain high concentrations of steps and kinks. Hydrogenolysis product distributions varied markedly with terrace structure. The symmetries of d orbitals that emerge from the surfaces with different atomic structure have been used to rationalize the structure sensitivity of light-alkane isomerization.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6204195
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 104:26; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

2-2-DIMETHYLPROPANE
2-METHYLPROPANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
BUTANE
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CRYSTAL FACES
DECOMPOSITION
DEHYDROGENATION
ELEMENTS
HYDROCARBONS
HYDROGENATION
ISOMERIZATION
METALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS