Cyclopropane isomerization over Eu[sup 3+]NaX zeolites

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(92)90002-Y· OSTI ID:5719612

Simon, M W; Efstathiou, A M; Bennett, C O; Suib, S L ^[1]

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1. Univ. of Connecticut, Storrs, CT (United States)

Cyclopropane isomerization to propylene over various Eu[sup 3+] loadings in NaX zeolite have been studied by measurements of steady-state and transient kinetics and by Fourier transform infrared spectroscopy. As Eu[sup 3+] loading increases, the rate of deactivation increases, the conversion increases, apparent activation energies are lowered, and Bronsted acid site strength and amounts increase. Apparent activation energies of 13-15 kcal/mol for propylene formation have been observed for these systems, consistent with literature reports for other metal supported heterogeneous catalyst systems. Deactivation studies have shown that activity can be restored by heating in He at 380[degrees]C between various temperature runs, and that gases desorbed during regeneration are predominantly propylene. Poisoning studies of Bronsted sites with Na vapor lead to deactivation of these catalysts. A reaction mechanism scheme based on [pi] allyl intermediates in the supercages of Eu[sup 3+]NaX has been proposed to account for the activity, selectivity, and stability of these catalysts. 28 refs., 14 figs.

• OSTI ID: 5719612
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 138:1; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
ALKANES
ALKENES
BROENSTED ACIDS
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CYCLOALKANES
ELEMENTS
ENERGY
EUROPIUM
HETEROGENEOUS CATALYSIS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOMERIZATION
KINETICS
LOADING
MATERIALS
MATERIALS HANDLING
METALS
MINERALS
ORGANIC COMPOUNDS
POISONING
PROPYLENE
RARE EARTHS
REACTION INTERMEDIATES
REACTION KINETICS
SILICATE MINERALS
SPECTROSCOPY
ZEOLITES