Cation promotion effect in zeolite-supported F-T catalysts: Final report
The present work was undertaken to investigate systematically the influence of Group IA neutralizing cations on CO hydrogenation over zeolite-supported ruthenium catalysts. These catalysts were prepared from NH/sub 4/Y, LiY, NaY, KY, RbY, CsY, NaX, KL, and Na-mordenite zeolites by ion exchange with ruthenium hexammine chloride. The nature of the group IA cations was found to have little effect on chemisorptive properties and on the activity and chain growth probability in CO hydrogenation on Ru. However, it was established that secondary acid-catalyzed reactions of the primary olefinic products from CO hydrogenation can play a major role in shaping product selectivity. Using model reactions such as olefin transformations on the zeolites without the metal, it was established that the strength of the acid sites is a strong function of the nature of the neutralizing alkali cations remaining in the zeolite. Acid site strength was found to decrease with molecular weight of the alkali cation used. This study established the bifunctional nature of the zeolite-supported F-T catalysts and its importance in CO hydrogenation. The results suggest that the catalyst selectivity can be controlled by varying the strength of the zeolite acid sites, the most important active centers for secondary reactions of the primary olefinic F-T products. Depending on the concentration and the strength of the acid sites, a function of the Si/Al ratio and the nature of the residual neutralizing cations, various competitive reaction paths can be observed for the transformation of olefinic compounds. These include isomerization, oligomerization, cracking, hydrogen transfer, etc. 67 figs., 32 tabs.
- Research Organization:
- Pittsburgh Univ., PA (USA). Dept. of Chemical and Petroleum Engineering
- DOE Contract Number:
- FG22-83PC60805
- OSTI ID:
- 7055533
- Report Number(s):
- DOE/PC/60805-T12; ON: DE87002505
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of group IA cations on CO hydrogenation over Ru/Y-zeolites
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Related Subjects
10 SYNTHETIC FUELS
CARBON MONOXIDE
CHEMISORPTION
HYDROGENATION
CATALYSTS
CHEMICAL PREPARATION
PROMOTERS
STRUCTURAL CHEMICAL ANALYSIS
FISCHER-TROPSCH SYNTHESIS
HYDROCARBONS
SYNTHESIS
HYDROGEN
RUTHENIUM
CATALYTIC EFFECTS
SORPTIVE PROPERTIES
ZEOLITES
2-METHYLPROPANE
ADSORPTION
BUTENES
CATALYST SUPPORTS
CESIUM COMPOUNDS
EXPERIMENTAL DATA
HIGH TEMPERATURE
ION EXCHANGE
ISOMERIZATION
LITHIUM COMPOUNDS
METHANE
PH VALUE
POTASSIUM COMPOUNDS
RUBIDIUM COMPOUNDS
SODIUM COMPOUNDS
SPECIFICITY
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALKANES
ALKENES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DATA
DIFFRACTION
ELEMENTS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MINERALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
SCATTERING
SEPARATION PROCESSES
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENTS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)
090121 - Hydrocarbon Fuels- Chemical Synthesis- (1976-1989)