Formation of new copper(II) species during propylene oxidation on copper(II)-exchange x zeolite

Journal Article · Thu Jul 26 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100378a069· OSTI ID:6190829

Yu, Jongsung; Kevan, L ^[1]

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1. Univ. of Houston, TX (USA)

The migration of copper(II) species and their coordination complexes in the zeolite framework was investigated during propylene oxidation on CuK-X zeolite in a flow system under conditions of excess oxygen and correlated with the reactivity over the temperature range of 100-400{degree}C. Electron spin resonance (ESR) and electron spin echo modulation (ESEM) are used to monitor the different Cu(II) species generated, their stereochemistry, their site locations, their migration, and the coordination during the reaction in K-X zeolite. The development of three new Cu(II) species has been observed by ESR during the reaction depending upon the reaction temperature. One new cupric ion species developed at relatively low reaction temperature is assigned to a copper(II)-CO{sub 2} complex in site SII{prime} in the {beta}-cage. At higher reaction temperature, the development of another new cupric ion species with g{sub {perpendicular}} > g{sub {parallel}} is assigned to a trigonal bipyramidal cupric ion in site SII between the {alpha}- and {beta}-cages.

• OSTI ID: 6190829
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:15; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKENES
CHEMICAL REACTIONS
COPPER COMPOUNDS
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
PROPYLENE
TRANSITION ELEMENT COMPOUNDS
ZEOLITES