Dehydrogenation of cyclohexane and dehydrocyclization of n-heptane over single crystal surfaces of iridium

Journal Article · Tue Mar 01 04:00:00 EST 1977 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(77)90208-1· OSTI ID:7213303

Nieuwenhuys, B E; Somorjai, G A

The dehydrogenation of cyclohexane and the dehydrocyclization of n-heptane were investigated at low hydrocarbon pressure (approximately 10/sup -5/ Torr) on two single crystal surfaces of iridium. The surfaces studied were Ir(111) and Ir(755) or stepped (6(111) x (100)). The reaction rates were monitored by a quadrupole mass spectrometer; the surface structure and surface composition were determined by means of low-energy electron diffraction and Auger electron spectroscopy. The results are discussed and compared with similar studies on single crystal surfaces of platinum. The stepped iridium surface appeared to be a factor of 3 to 5 more active in dehydrogenation than the iridium (111) surface. The activity of iridium in dehydrocyclization was lower than that for platinum surfaces of the same structure.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 7213303
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 46:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
AROMATIZATION
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CRYSTALS
DEHYDROGENATION
ELEMENTS
HEPTANE
HYDROCARBONS
IRIDIUM
METALS
MONOCRYSTALS
ORGANIC COMPOUNDS
PLATINUM METALS
REFRACTORY METALS
TRANSITION ELEMENTS