Thermodynamics and kinetic effects in platinum-catalyzed n-hexane transformations

Journal Article · Fri Jun 15 00:00:00 EDT 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(79)90249-5· OSTI ID:6634863

Paal, Z; Szekely, G; Tetenyi, P

The conversion of n-hexane to 2- and 3-methylpentane, methylcyclopentane, and benzene on platinum black at 600/sup 0/ and 700/sup 0/K in a pulse microreactor gave outlet concentrations which were higher in saturated C/sub 6/ products and lower in benzene concentrations than calculated equilibrium concentrations. An ''effective surface hydrogen pressure'', which was always higher than the hydrogen pressure in the bulk gas phase, accounted for the deviation. The difference between the hypothetical surface and gas-phase hydrogen pressures was greater at 700/sup 0/ than at 600/sup 0/K; also, at 600/sup 0/K, a negative hydrogen order was observed in the over-all conversion. Both phenomena suggest that at least two types of sorbed hydrogen were present, whose relative abundance controls the relative amount of two surface species which react further (independently of each other) to form saturated products and benzene.

• Research Organization: Inst. Isotopes, Hung. Acad. Sci.
• OSTI ID: 6634863
• Journal Information: J. Catal.; (United States), Vol. 58:1
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HEXANE
CONVERSION
CATALYSTS
CHEMICAL REACTION KINETICS
HYDROGEN
PHASE STUDIES
PLATINUM
SURFACE PROPERTIES
THERMODYNAMICS
ALKANES
ELEMENTS
HYDROCARBONS
KINETICS
METALS
NONMETALS
ORGANIC COMPOUNDS
PLATINUM METALS
REACTION KINETICS
TRANSITION ELEMENTS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)