Electron spin resonance and electron spin echo modulation study of paramagnetic Ru species generated in Li-X, Na-X, K-X, and Ca-X zeolites: Adsorption of carbon monoxide, oxygen, and water

Journal Article · Thu Aug 09 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100379a043· OSTI ID:6380971

Lei, Guandao; Kevan, L ^[1]

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1. Univ. of Houston, Texas (USA)

Paramagnetic ruthenium species are formed in X zeolites with different cocations after evacuation at 300{degree}C and subsequent adsorption of various molecules. The various species formed after activation were characterized by electron spin resonance (ESR) and electron spin echo modulation (ESEM) spectroscopies. No major difference was observed in the ESR spectra after activation for the zeolites exchanged with (Ru(NH{sub 3}){sub 6})Cl{sub 3} or (Ru(NH{sub 3}){sub 5}Cl)Cl{sub 2}. Activation of these zeolites did not generate any substantial amount of paramagnetic species. However, exposure of the activated zeolite, except for RuLi-X, to CO, O{sub 2}, and H{sub 2}O resulted in a significant increase in the spin concentration which was assigned mainly to Ru(III) species. The increase in the spin concentration is suggested to be due to dissociation of Ru(III) dimers in the {beta}-cage of the zeolite structure when an adsorbate is added. Adsorption of CO and O{sub 2} generated one or more Ru(III) adducts depending on the nature of the cocation.

• OSTI ID: 6380971
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:16; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
DATA
DATA ANALYSIS
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MAGNETIC RESONANCE
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
RESONANCE
RUTHENIUM COMPOUNDS
SORPTION
TRANSITION ELEMENT COMPOUNDS
WATER
ZEOLITES