Dual cobalt speciation in Co/ZSM-5 catalysts

Journal Article · Sat Jan 01 00:00:00 EST 1983 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(83)90090-8· OSTI ID:7056926

Stencel, J M; Rao, V U.S.; Diehl, J R; Rhee, K H; Dhere, A G; DeAngelis, R J

X-Ray diffraction, X-ray photoelectron spectroscopy, and infrared spectroscopy are used to investigate cobalt speciation in Co/ZSM-5 catalysts containing 1.4 to 9.5 wt% cobalt. These catalysts, metal-impregnated using incipient wetness techniques with Co(NO/sub 3/)/sub 2/ x 6H/sub 2/O, are shown to contain highly dispersed, ion-exchanged, non-reducible Co/sup 2 +/ species interior to the ZSM-5, and large, reducible cobalt oxide crystallites on the exterior of the ZSM-5 crystallite surface. The number of Co/sup 2 +/ ions located inside a unit cell of ZSM-5 and the number of pyridine molecules that coordinately bond to each of these ions are estimated by using infrared data characterizing pyridine chemisorption. The crystalline forms of cobalt on the surface of the ZSM-5 are identified and their sizes estimated after O/sub 2/ calcination, H/sub 2/ reduction, and CO + H/sub 2/ exposure. These data are then scrutinized for correlations of chemical and physical properties of the Co/ZSM-5 catalysts with conversion activity and selectivity for synthesis of hydrocarbons from CO + H/sub 2/ gas. 15 references, 5 figures, 3 tables.

• Research Organization: Pittsburgh Energy Tech. Center, PA
• OSTI ID: 7056926
• Journal Information: J. Catal.; (United States), Vol. 84
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
COBALT
CATALYTIC EFFECTS
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
SYNTHESIS
METHANATION
CATALYSTS
PYRIDINE
CHEMISORPTION
ZEOLITES
CATALYST SUPPORTS
CORRELATIONS
CRYSTAL STRUCTURE
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
HYDRATES
IMPREGNATION
INFRARED SPECTRA
MOLECULAR STRUCTURE
OXIDATION
PHOTOELECTRON SPECTROSCOPY
QUANTITY RATIO
REDUCTION
X-RAY DIFFRACTION
AZINES
CHEMICAL REACTIONS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
HETEROCYCLIC COMPOUNDS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SCATTERING
SEPARATION PROCESSES
SORPTION
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENTS
360201* - Ceramics
Cermets
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360202 - Ceramics
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