Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis
Technical Report
·
OSTI ID:10110812
Nanometer sized metal particles were encapsulated in the micropores of xerogels and aerogels. The synthesis involves the sequential reduction of a metal salt followed by sol-gel processing in an inverse micelle solution. The inverse micelle solution solubilizes the metal salt and provides a micro-reactor for the nucleation, growth, and stabilization of the nanometer sized clusters. Hydrolysis and condensation of an added siloxane precursor produces a wet gel embedding the particles. Characterization of the particle size and composition and the particle growth process was completed with transmission electron microscopy (TEM), electron diffraction, and UV-visible absorption spectrometry. Characterization of the gel surface areas was completed with N{sub 2} porosimetry. Material properties determined as a function of the gel precursor (TEOS vs. a pre-hydrolyzed form of TEOS), the water to gel precursor reaction stoichiometry, and surfactant concentration are discussed in terms of the unique solution chemistry occurring in the micro-heterogeneous inverse micelle solutions. Finally, catalyst development and catalyst activity of the materials are discussed. 1-hexene hydrogenation was chosen as a model reaction.
- Research Organization:
- Sandia National Labs., Catalysis and Chemical Technologies Dept., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10110812
- Report Number(s):
- SAND--97-1031; ON: TI97020707; BR: YN0100000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360600
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMICAL PREPARATION
ENCAPSULATION
EXPERIMENTAL DATA
GOLD
HEXENES
HYDROGENATION
OTHER MATERIALS
PALLADIUM
PARTICLE SIZE
SILICA
SURFACE AREA
360600
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
CHEMICAL PREPARATION
ENCAPSULATION
EXPERIMENTAL DATA
GOLD
HEXENES
HYDROGENATION
OTHER MATERIALS
PALLADIUM
PARTICLE SIZE
SILICA
SURFACE AREA