The effects of protons on the hydrogenolysis of neopentane over rhodium catalysts: Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1150· OSTI ID:6215997

Wong, T T.T.; Sachtler, W M.H. ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

The hydrogenolysis of neopentane (2.2-dimethylpropane) has been studied over the rhodium catalysts Rh/Hy, Rh/NaHY, and Rh/SiO[sub 2]. The catalytic activity follows the sequence: Rh/HY>Rh/NaHY [approx] Rh/SiO[sub 2]. For all catalysts, the conversion of neopentane was 100% selective to hydrogenolysis products, methane, and isobutane; they are formed in a ratio of 1:1. In an attempt to determine the true activation energies from the apparent activation energies derived from the Arrhenius curves, corrections were made for the preequilibrium between gaseous and physisorbed neopentane. The adsorption of neopentane on the metal-free supports was determined; isosteric heats of adsorption were calculated from these data. For zeolites NaY and HY they are 8.2 and 7.0 kcal/mol, respectively. After correcting for the preequilibrium, the true activation energies are 33.5 and 38.8 kcal/mol for Rh/HY and Rh/NaHY, respectively. The results lend support to the concept that the superior activity of Rh/HY is due to the [open quotes]electron deficiency[close quotes] of the rhodium particles. 52 refs., 4 figs., 4 tab.

• OSTI ID: 6215997
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Journal Issue: 2 Vol. 141:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
2-2-DIMETHYLPROPANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION HEAT
ACTIVATION ENERGY
ALKANES
ARRHENIUS EQUATION
BARYONS
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
CONVERSION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
ENTHALPY
EQUATIONS
FERMIONS
HADRONS
HEAT
HETEROGENEOUS CATALYSIS
HYDROCARBONS
HYDROGENATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
METHANE
MINERALS
NUCLEONS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
PROTONS
RHODIUM
SILICATE MINERALS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
ZEOLITES