Duel cobalt speciation in Co/ZSM-5 catalysts

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

OSTI ID:5403720

Stencel, J M ^[1]; Rao, V U.S.; Diehl, J R; Rhee, K H; Dhere, A G; DeAngelis, R J

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1. Pittsburgh Energy Tech. Center, PA

X-ray diffraction, x-ray photoelectron sepctroscopy, 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/ . 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.

• OSTI ID: 5403720
• Journal Information: J. Catal.; (United States), Vol. 84:1
• Country of Publication: United States
• Language: English

Related Subjects

10 SYNTHETIC FUELS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
CHEMICAL REACTION YIELD
BUTANE
CARBON MONOXIDE
METHANATION
CATALYSTS
CHEMICAL PREPARATION
COBALT
CALCINATION
CATALYTIC EFFECTS
INFRARED SPECTRA
SORPTIVE PROPERTIES
COBALT OXIDES
ETHANE
HYDROGEN
CHEMICAL REACTIONS
CHEMISORPTION
METHANE
PROPANE
PYRIDINE
ZEOLITES
AQUEOUS SOLUTIONS
BINDING ENERGY
CATALYST SUPPORTS
CATIONS
COBALT NITRATES
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
GAS CHROMATOGRAPHY
GASES
HYDRATES
IMPREGNATION
LIQUIDS
OXYGEN
PARTICLE SIZE
PHOTOELECTRON SPECTROSCOPY
SAMPLE PREPARATION
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS GAS
X-RAY DIFFRACTION
ALKANES
AZINES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHROMATOGRAPHY
COBALT COMPOUNDS
COHERENT SCATTERING
DATA
DECOMPOSITION
DIFFRACTION
DISPERSIONS
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
FLUIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONS
MATERIALS
METALS
MINERALS
MIXTURES
NITRATES
NITROGEN COMPOUNDS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYRIDINES
PYROLYSIS
SCATTERING
SEPARATION PROCESSES
SIZE
SOLUTIONS
SORPTION
SPECTRA
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400201 - Chemical & Physicochemical Properties