Microstructural study of an iron silicate catalyst using electron microscopy

Conference · Thu Sep 01 00:00:00 EDT 1988 · American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)

OSTI ID:5200660

Csencsits, R; Gronsky, R ^[1]

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1. Lawrence Berkeley Lab., CA (USA)

Iron silicate analogs of the zeolite ZSM-5 may be directly synthesized from iron silicate gels in a manner which differs slightly from the alumino-silicate ZSM-5. The resultant white, crystalline iron silicate is referred to as FeZSM-5 in the as-synthesized form. Thermal treatment removes the organic crystal-directing agent and moves some of the framework iron into non-framework sites, thus producing the calcined form of the molecular sieve FeZSM-5. Subsequent hydrothermal treatment moves more of the iron out of the molecular sieve framework. This iron-rich second phase and the ZSM-5 pore structure can be used to convert synthesis gas (CO and H{sub 2}) to gasoline range hydrocarbons and water (Fischer-Tropsch synthesis). to optimize the Fischer-Tropsch catalyst, homogeneity both in the particle size distribution and in the distribution of catalytic iron throughout the particles is desired. Electron microscopy, with its high spatial resolution, plays an important role in the physical characterization of these catalysts. Scanning electron microscopy (SEM) is used to characterize the molecular sieve particle sizes and morphologies as a function of preparation conditions. Transmission electron microscopy (TEM) is used to follow the changes in the microstructure of the iron silicates caused by different growth conditions and by subsequent thermal and hydrothermal treatments.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5200660
• Report Number(s): CONF-880939-; CODEN: ACPCA
• Journal Information: American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA), Vol. 33:4; Conference: Symposium on preparation and characterization of catalysts, Los Angeles, CA (USA), 25-30 Sep 1988; ISSN 0569-3799
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
IRON SILICATES
MICROSTRUCTURE
ZEOLITES
CATALYSTS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
FISCHER-TROPSCH SYNTHESIS
MOLECULAR SIEVES
ADSORBENTS
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON COMPOUNDS
MATERIALS
MICROSCOPY
MINERALS
NUMERICAL DATA
OXYGEN COMPOUNDS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)
360602 - Other Materials- Structure & Phase Studies