ZSM-5 supported Fe and Ru from Fe/sub 3/(CO)/sub 12/ and Ru/sub 3/(CO)/sub 12/: Structure-activity correlations for synthesis gas conversion
Bifunctional catalysts consisting of Fe and Ru supported on ZSM-5 have been prepared by an extraction technique using metal cluster carbonyls. As anticipated, these precursors of the supported metal component were excluded from the ZSM-5 channels which have a diameter significantly smaller than that of the metal clusters. Evidence for this restriction was obtained from studies of the catalysts by ISS, XPS and pyridine chemisorption. These studies revealed that the metal was present as highly dispersed metal particles on the external surface of the ZSM-5 particles and that obstruction of the zeolite channels and extensive interaction with Bronsted acid sites did not occur. As a result, these materials were found to be efficient bifunctional catalysts for synthesis gas conversion. The metal component produces hydrocarbon and oxygenated products and intermediates which are further converted by the zeolite to mixtures containing substantial fractions of aromatic and branched hydrocarbons. Calcination of a Ru/ZSM-5 catalyst prior to evaluation results in an increase in the average metal particle size. When evaluated, this catalyst exhibits less activity, but greater selectivity for higher molecular weight products when compared to the as-prepared catalyst. However, rapid deactivation of the calcined catalyst occurred. Although the reason for this is not clear at the time of writing, this behavior is being investigated. The product distributions obtained by synthesis gas conversion over the above bifunctional catalysts are compared with those obtained from catalysts consisting of the metal component dispersed on a conventional oxide support as well as from these catalysts physically mixed with ZSM-5.
- Research Organization:
- Dept. of Chemistry, Virginia Commonwealth Univ., Richmond, VA 23284
- OSTI ID:
- 6786563
- Report Number(s):
- CONF-8609181-; TRN: 87-009636
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Vol. 31:3; Conference: ACS symposium on syngas conversion catalysis advances in gasification, Santa Clara, CA, USA, 7 Sep 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBONYLS
CATALYTIC EFFECTS
HYDROCARBONS
CHEMICAL PREPARATION
IRON COMPOUNDS
RUTHENIUM COMPOUNDS
ZEOLITES
CALCINATION
CATALYST SUPPORTS
CHEMISORPTION
EXTRACTION
MOLECULAR WEIGHT
OXYGEN
PARTICLE SIZE
PHOTOELECTRON SPECTROSCOPY
PYRIDINE
SYNTHESIS GAS
X RADIATION
AZINES
CHEMICAL REACTIONS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
FLUIDS
GASES
HETEROCYCLIC COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IONIZING RADIATIONS
MATERIALS
MINERALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
PYROLYSIS
RADIATIONS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SIZE
SORPTION
SPECTROSCOPY
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
090121* - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)
400201 - Chemical & Physicochemical Properties