Catalytic and electron spin resonance studies of propylene oxidation on copper(II)-exchanged X zeolite: Temperature dependence of copper(II) migration

Journal Article · Thu Sep 20 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100382a056· OSTI ID:6469117

Yu, Jongsung; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

The copper(II)-catalyzed oxidation of propylene on CuK-X zeolite was studied under conditions of excess oxygen over the temperature range of 100 to 400{degree}C in a flow system to investigate the temperature dependence of the catalytic activity and the migration of copper(II) species and Cu(II) coordination complexes in the zeolite framework. It is shown that the percent of propylene conversion depends upon the reaction temperature and upon the extent of Cu(II) exchanged into the zeolite. Temperature causes the cupric ions to migrate near the six-ring window between the {alpha} and {beta} cages of the zeolite structure where they complex with propylene and induce the oxidation reaction. Arrhenius activation energies decrease with increasing copper(II) content. The decreasing activation energy with decreasing Cu(II) content is associated with different site occupancies of Cu(II) within the zeolite structure. Electron spin resonance studies show that cupric ions are initially distributed in SI hexagonal prism sites and SI{prime} sites in the {beta} cage adjacent to the hexagonal prisms in dehydrated CuK-X zeolite.

• OSTI ID: 6469117
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:19; ISSN 0022-3654; ISSN JPCHA
• 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
ALKENES
CATALYSIS
CHEMICAL REACTIONS
COMPLEXES
COPPER COMPLEXES
ELECTRON SPIN RESONANCE
HIGH TEMPERATURE
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIALS
MINERALS
ORGANIC COMPOUNDS
OXIDATION
PROPYLENE
RESONANCE
SPECTROSCOPY
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES
ZEOLITES