CO hydrogenation on PdCo/NaY catalysts: Effect of ion hydration on metal phases and selectivity

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Journal of Catalysis; (United States)

OSTI ID:6259654

Yin, Yuangen; Zhang, Zongchao; Sachtler, W M.H. ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

Exposure of calcined PdCo/NaY catalyst precursors to water vapor, prior to reduction, strongly affects the CO hydrogenation activity and selectivity of the reduced bimetal catalysts. With samples that had been exposed to H[sub 2]O before reduction, the formation of hydrocarbons prevails; nonhydrated reference samples of the same overall composition are mainly selective for oxygenates. After 6 h of reaction time PdCo alloy particles of 5.8 nm are detected by XRD in H[sub 2]O-exposed catalysts, but in the reference samples the metal particles are below the limit of detection by XRD. The observed effects are attributed to the formation of mobile aquo-complexes of metal ions; after reduction they are converted to larger alloy particles, richer on Co, than in the reference samples. Results obtained with NaOH-neutralized and Co-free Pd/NaY catalysts are also discussed. 23 refs., 13 figs., 1 tab.

• OSTI ID: 6259654
• Journal Information: Journal of Catalysis; (United States), Vol. 139:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
01 COAL, LIGNITE, AND PEAT
CARBON MONOXIDE
HYDROGENATION
COBALT COMPOUNDS
CATALYTIC EFFECTS
PALLADIUM COMPOUNDS
CATALYST SUPPORTS
CATALYSTS
HYDRATION
HYDROCARBONS
IONS
PARTICLES
REDUCTION
WATER VAPOR
X-RAY DIFFRACTION
ZEOLITES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
COHERENT SCATTERING
DIFFRACTION
FLUIDS
GASES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILICATE MINERALS
SOLVATION
TRANSITION ELEMENT COMPOUNDS
VAPORS
400201* - Chemical & Physicochemical Properties
010408 - Coal
Lignite
& Peat- C1 Processes- (1987-)