Cited by 616Zeolite Catalysis and SynthesisMetal-Organic Frameworks: Synthesis and ApplicationsMembrane Separation and Gas Transport

A titanosilicate molecular sieve with adjustable pores for size-selective adsorption of molecules

Kuznicki, Steven M., Bell, Valerie A., Nair, Sankar, Hillhouse, Hugh W., Jacubinas, Richard M., Braunbarth, Carola M., Toby, Brian H., Tsapatsis, Michael·2001·Nature

Abstract

Zeolites and related crystalline microporous oxides-tetrahedrally coordinated atoms covalently linked into a porous framework-are of interest for applications ranging from catalysis to adsorption and ion-exchange. In some of these materials (such as zeolite rho) adsorbates, ion-exchange, and dehydration and cation relocation can induce strong framework deformations. Similar framework flexibility has to date not been seen in mixed octahedral/tetrahedral microporous framework materials, a newer and rapidly expanding class of molecular sieves. Here we show that the framework of the titanium silicate ETS-4, the first member of this class of materials, can be systematically contracted through dehydration at elevated temperatures to 'tune' the effective size of the pores giving access to the interior of the crystal. We show that this so-called 'molecular gate' effect can be used to tailor the adsorption properties of the materials to give size-selective adsorbents suitable for commercially important separations of gas mixtures of molecules with similar size in the 4.0 to 3.0 A range, such as that of N2/CH4, Ar/O2 and N2/O2.

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Crossref · 10.1038/35089052

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24 of 24 references verified0 citation errors · 0 not checkable

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  • Contracted Engelhard titanosilicate CTS-1 (Na,Sr-ETS-4 treated at 300-340 °C) was patented to separate oxygen from air based on molecular sieving of oxygen at room temperature.

    “Some years later, another zeolite-related material, i.e., contracted Engelhard titanosilicate CTS-1 (Na,Sr-ETS-4 treated at 300–340 °C), was patented to carry out the separation of oxygen from air based on the molecular sieving of oxygen at room temperature,447,448 thus recovering Milton’s original idea.17”
  • Titanosilicate materials ETS-4, CTS-1, Ba-ETS-4, and Sr-ETS-4 have been demonstrated to be excellent adsorbents for nitrogen removal from natural gas at small scale.

    “Titanosilicate materials developed by Engelhard Corporation (now BASF), such as ETS-4, CTS-1, Ba-ETS-4, and Sr-ETS-4, have been demonstrated to be excellent adsorbents for this application at a small scale.448,451,457−459”

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Authors
Kuznicki, S. M., Bell, V. A., Nair, S., Hillhouse, H. W., Jacubinas, R. M., Braunbarth, C. M., Toby, B. H., & Tsapatsis, M.
Affiliations
  • University of Massachusetts Amherst (US)
  • National Institute of Standards and Technology (US)
Corresponding author
Kuznicki, Steven M.
Venue
Nature
Published
2001-08-16
Volume
412
Issue
6848
Pages
720-724
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2062719158
Cited by
616
References
29
Citations by year
2026: 17 · 2025: 35 · 2024: 22 · 2023: 20 · 2022: 26 · 2021: 28 · 2020: 21 · 2019: 27 · 2018: 21 · 2017: 20 · 2016: 18 · 2015: 16 · 2014: 29 · 2013: 16 · 2012: 35
FWCI
11.53
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
Deutsche Forschungsgemeinschaft
Topics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Organic Frameworks: Synthesis and Applications
  • Physical Sciences › Engineering › Mechanical Engineering › Membrane Separation and Gas Transport
Keywords
ETS-4, framework flexibility, size-selective adsorption, gas separation, zeolite-like materials, CH4/N2 separation

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