Active states of rhodium in rhodium exchanged Y zeolite catalysts for hydrogenation of ethylene and acetylene and dimerization of ethylene studied with X-ray photoelectron spectroscopy
ESCA and ESR spectroscopic studies of 18 and 50Vertical Bar3< rhodium-exchanged Y zeolites, activated under vacuum at 100/sup 0/-600/sup 0/C, and activity tests for ethylene hydrogenation and dimerization and acetylene hydrogenation in a static reactor at 20/sup 0/C and 76-100 mm Hg provided evidence that during reduction under vacuum of the rhodium(III) in the zeolite, part of the rhodium formed stable rhodium(I) ions, possibly partly associated with residual chlorine or hydride ions. The bare rhodium(I) cations were coordinatively unsaturated, were more stable at the lower rhodium exchange levels, and were active in ethylene hydrogenation and dimerization. The formation of atomically dispersed and clustered rhodium(0) was also observed during the heat treatment; it was active for acetylene hydrogenation and ethylene dimerization. The results were similar to results obtained with chloro tris(triphenylphosphine) rhodium(I) and various other homogeneous catalysts, and similar mechanisms apparently apply to the two types of catalysts.
- Research Organization:
- Osaka Univ.
- OSTI ID:
- 6675595
- Journal Information:
- J. Catal.; (United States), Vol. 58:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ZEOLITES
ION EXCHANGE
ACETYLENE
CATALYSTS
CHEMICAL REACTION KINETICS
DIMERIZATION
ETHYLENE
HEAT TREATMENTS
HYDROGENATION
RHODIUM
STRUCTURAL CHEMICAL ANALYSIS
ALKENES
ALKYNES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MATERIALS
METALS
MINERALS
ORGANIC COMPOUNDS
PLATINUM METALS
POLYMERIZATION
REACTION KINETICS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)