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Title: Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis

Abstract

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.

Authors:
; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Catalysis and Chemical Technologies Dept., Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10110812
Report Number(s):
SAND-97-1031
ON: TI97020707; BR: YN0100000; TRN: AHC29908%%30
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: May 1997
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; CATALYSTS; CHEMICAL PREPARATION; SILICA; PALLADIUM; GOLD; ENCAPSULATION; PARTICLE SIZE; SURFACE AREA; CATALYTIC EFFECTS; HEXENES; HYDROGENATION; EXPERIMENTAL DATA; 400201; 360600; CHEMICAL AND PHYSICOCHEMICAL PROPERTIES; OTHER MATERIALS

Citation Formats

Martino, A, Kawola, J S, Yamanaka, S A, and Loy, D A. Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis. United States: N. p., 1997. Web.
Martino, A, Kawola, J S, Yamanaka, S A, & Loy, D A. Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis. United States.
Martino, A, Kawola, J S, Yamanaka, S A, and Loy, D A. Thu . "Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis". United States.
@article{osti_10110812,
title = {Encapsulation of metal nanocluster catalysts in silica materials via an inverse micelle/sol-gel synthesis},
author = {Martino, A and Kawola, J S and Yamanaka, S A and Loy, D A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {5}
}

Technical Report:
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