The genesis of carbon-supported Fe-Mn and K-Fe-Mn catalysts from stoichiometric metal carbonyl clusters. III. Characterization by chemisorption, calorimetry, and kinetic analysis

Journal Article · Sun Oct 01 00:00:00 EDT 1989 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(89)90174-7· OSTI ID:7089986

Venter, J J; Chen, A A; Phillips, J; Vannice, M A ^[1]

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1. The Pennsylvania State Univ., University Park (USA)

Carbon-supported Fe, Fe-Mn, and K-Fe-Mn catalysts derived from stoichiometric mixed-metal carbonyl clusters were pretreated at either 473 or 673 K in H{sub 2} after which their chemisorption behavior and catalytic properties for CO hydrogenation were determined. The iron remained well-dispersed at all times except after high temperature reduction when potassium was present. The single promotion by either Mn or K increased the olefin/paraffin ratio, and the doubly promoted catalyst gave very high selectivity to light olefins. Integral CO heats of adsorption at 300 K were measured, and they increased from 15 kcal/mole on the Fe/C catalysts to nearly 17 kcal/mole on each singly promoted sample to 21 kcal/mole on the doubly promoted catalyst. A model for the decomposition of these carbonyl clusters is proposed based on these results combined with previous studies utilizing Moessbauer effect spectroscopy, transmission election microscopy/energy dispersive spectroscopy, and diffuse reflectance Fourier transform infrared spectroscopy. The state of the MnO{sub x} and K phases on the iron surface, as well as Fe crystallite size, appears to play a dominant role in determining catalytic behavior.

• OSTI ID: 7089986
• Journal Information: Journal of Catalysis; (USA), Vol. 119:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON MONOXIDE
HYDROGENATION
IRON
CATALYTIC EFFECTS
SURFACE PROPERTIES
MANGANESE
POTASSIUM
ADSORPTION HEAT
ALKANES
ALKENES
CARBON
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMISORPTION
CRYSTAL STRUCTURE
DECOMPOSITION
FISCHER-TROPSCH SYNTHESIS
FOURIER TRANSFORMATION
INFRARED SPECTRA
MATHEMATICAL MODELS
MOESSBAUER EFFECT
PHASE STUDIES
PROMOTERS
REDUCTION
SPECTROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
ALKALI METALS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON MICROSCOPY
ELEMENTS
ENTHALPY
HYDROCARBONS
INTEGRAL TRANSFORMATIONS
KINETICS
METALS
MICROSCOPY
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
SPECTRA
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSFORMATIONS
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)