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Synthesis and catalytic properties of metal clusters encapsulated within small-pore (SOD, GIS, ANA) zeolites.

The synthesis protocols for encapsulation of metal clusters reported here expand the diversity in catalytic chemistries made possible by the ability of microporous solids to select reactants, transition states, and products on the basis of their molecular size. We report a synthesis strategy for the... Full description

Journal Title: Journal of the American Chemical Society October 24, 2012, Vol.134(42), pp.17688-17695
Main Author: Goel, Sarika
Other Authors: Wu, Zhijie , Zones, Stacey I , Iglesia, Enrique
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1520-5126 ; DOI: 1520-5126 ; DOI: 10.1021/ja307370z
Link: http://search.proquest.com/docview/1115062214/?pq-origsite=primo
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recordid: proquest1115062214
title: Synthesis and catalytic properties of metal clusters encapsulated within small-pore (SOD, GIS, ANA) zeolites.
format: Article
creator:
  • Goel, Sarika
  • Wu, Zhijie
  • Zones, Stacey I
  • Iglesia, Enrique
subjects:
  • Amines–Chemistry
  • Ammonia–Chemistry
  • Catalysis–Chemistry
  • Ligands–Chemistry
  • Metals, Heavy–Chemistry
  • Particle Size–Chemistry
  • Surface Properties–Chemistry
  • Zeolites–Chemistry
  • Amines
  • Ligands
  • Metals, Heavy
  • Zeolites
  • Ammonia
ispartof: Journal of the American Chemical Society, October 24, 2012, Vol.134(42), pp.17688-17695
description: The synthesis protocols for encapsulation of metal clusters reported here expand the diversity in catalytic chemistries made possible by the ability of microporous solids to select reactants, transition states, and products on the basis of their molecular size. We report a synthesis strategy for the encapsulation of noble metals and their oxides within SOD (Sodalite, 0.28 nm × 0.28 nm), GIS (Gismondine, 0.45 nm × 0.31 nm), and ANA (Analcime, 0.42 nm × 0.16 nm) zeolites. Encapsulation was achieved via direct hydrothermal synthesis for SOD and GIS using metal precursors stabilized by ammonia or organic amine ligands, which prevent their decomposition or precipitation as colloidal hydroxides at the conditions of hydrothermal synthesis (12), thereby causing precipitation of even ligand-stabilized metal precursors as hydroxides. As a result, encapsulation was achieved by the recrystallization of metal clusters containing GIS into ANA, which retained these metal clusters within voids throughout the GIS-ANA transformation.
language: eng
source:
identifier: E-ISSN: 1520-5126 ; DOI: 1520-5126 ; DOI: 10.1021/ja307370z
fulltext: no_fulltext
issn:
  • 15205126
  • 1520-5126
url: Link


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titleSynthesis and catalytic properties of metal clusters encapsulated within small-pore (SOD, GIS, ANA) zeolites.
creatorGoel, Sarika ; Wu, Zhijie ; Zones, Stacey I ; Iglesia, Enrique
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subjectAmines–Chemistry ; Ammonia–Chemistry ; Catalysis–Chemistry ; Ligands–Chemistry ; Metals, Heavy–Chemistry ; Particle Size–Chemistry ; Surface Properties–Chemistry ; Zeolites–Chemistry ; Amines ; Ligands ; Metals, Heavy ; Zeolites ; Ammonia
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descriptionThe synthesis protocols for encapsulation of metal clusters reported here expand the diversity in catalytic chemistries made possible by the ability of microporous solids to select reactants, transition states, and products on the basis of their molecular size. We report a synthesis strategy for the encapsulation of noble metals and their oxides within SOD (Sodalite, 0.28 nm × 0.28 nm), GIS (Gismondine, 0.45 nm × 0.31 nm), and ANA (Analcime, 0.42 nm × 0.16 nm) zeolites. Encapsulation was achieved via direct hydrothermal synthesis for SOD and GIS using metal precursors stabilized by ammonia or organic amine ligands, which prevent their decomposition or precipitation as colloidal hydroxides at the conditions of hydrothermal synthesis (<380 K) and favor interactions between metal precursors and incipient aluminosilicate nuclei during self-assembly of microporous frameworks. The synthesis of ANA requires higher crystallization temperatures (~415 K) and high pH (>12), thereby causing precipitation of even ligand-stabilized metal precursors as hydroxides. As a result, encapsulation was achieved by the recrystallization of metal clusters containing GIS into ANA, which retained these metal clusters within voids throughout the GIS-ANA transformation.
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