A study of the methylcyclopropane hydrogenation reaction over supported platinum catalysts

Book · Sun Jan 01 04:00:00 EST 1978

OSTI ID:5749582

Otero-Schipper, P H

The methylcyclopropane hydrogenation reaction to iso- and n-butane over platinum/silica and platinum/alumina catalysts at 0/sup 0/C and 1 atm with a hydrogen-hydrocarbon feed ratio of 16:1 showed mild structure sensitive behavior. The activation energies were 38.3 +/-1.3 kj/mole and 43.71 +/-4 kj/mole for the isobutane and n-butane formation rates, respectively, on the platinum on silica catalysts. Turnover numbers and activation energies for the platinum on alumina catalysts were similar to those for platinum on silica. The low coordination sites on both catalysts were the active sites for this reaction. At increased hydrogen pretreatment temperature from 24/sup 0/C to 480/sup 0/C, two platinum/silica catalysts showed high activity at room temperature treatment and minimum activity at 250/sup 0/C, increasing again only above 250/sup 0/C. The platinum/alumina catalysts showed the same pattern except for low activity at room temperature. This difference between the supports is attributed to the ease of oxygen removal by hydrogen at room temperature from platinum sites on the support, silica but not alumina promoting complete removal of oxygen to create a large number of vacant low coordination sites. Chloride compounds on the alumina but not silica catalysts promoted isomerization of methylcyclopropane to n-butenes.

• OSTI ID: 5749582
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ALKANES
CATALYSIS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRACKING
CYCLOALKANES
DECOMPOSITION
ELEMENTS
ENERGY
HYDROCARBONS
HYDROCRACKING
HYDROGENATION
KINETICS
METALS
ORGANIC COMPOUNDS
PLATINUM
PLATINUM METALS
PYROLYSIS
REACTION KINETICS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS