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

Author

Listed:
  • Steven M. Kuznicki

    (Strategic Technology Group, Engelhard Corporation)

  • Valerie A. Bell

    (Strategic Technology Group, Engelhard Corporation)

  • Sankar Nair

    (159 Goessmann Laboratory, University of Massachusetts)

  • Hugh W. Hillhouse

    (159 Goessmann Laboratory, University of Massachusetts)

  • Richard M. Jacubinas

    (Strategic Technology Group, Engelhard Corporation)

  • Carola M. Braunbarth

    (159 Goessmann Laboratory, University of Massachusetts)

  • Brian H. Toby

    (NIST Center for Neutron Research, National Institute of Standards and Technology)

  • Michael Tsapatsis

    (159 Goessmann Laboratory, University of Massachusetts)

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-exchange1. In some of these materials (such as zeolite rho) adsorbates2, ion-exchange, and dehydration and cation relocation3,4 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 sieves5,6,7,8,9,10,11,12,13,14,15,16. Here we show that the framework of the titanium silicate ETS-4, the first member of this class of materials8, 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 adsorbents17 suitable for commercially important separations of gas mixtures of molecules with similar size in the 4.0 to 3.0 Å range, such as that of N2/CH4, Ar/O2 and N2/O2.

Suggested Citation

  • Steven M. Kuznicki & Valerie A. Bell & Sankar Nair & Hugh W. Hillhouse & Richard M. Jacubinas & Carola M. Braunbarth & Brian H. Toby & Michael Tsapatsis, 2001. "A titanosilicate molecular sieve with adjustable pores for size-selective adsorption of molecules," Nature, Nature, vol. 412(6848), pages 720-724, August.
    • Handle: RePEc:nat:nature:v:412:y:2001:i:6848:d:10.1038_35089052
    DOI: 10.1038/35089052
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    Cited by:

    1. Bacsik, Zoltán & Cheung, Ocean & Vasiliev, Petr & Hedin, Niklas, 2016. "Selective separation of CO2 and CH4 for biogas upgrading on zeolite NaKA and SAPO-56," Applied Energy, Elsevier, vol. 162(C), pages 613-621.
    2. Mingke Yang & Huishan Wang & Julian Y. Zuo & Chun Deng & Bei Liu & Liya Chai & Kun Li & Han Xiao & Peng Xiao & Xiaohui Wang & Wan Chen & Xiaowan Peng & Yu Han & Zixuan Huang & Baocan Dong & Changyu Su, 2022. "Efficient separation of butane isomers via ZIF-8 slurry on laboratory- and pilot-scale," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    3. Kaifei Chen & Zhi Yu & Seyed Hesam Mousavi & Ranjeet Singh & Qinfen Gu & Randall Q. Snurr & Paul A. Webley & Gang Kevin Li, 2023. "Regulating adsorption performance of zeolites by pre-activation in electric fields," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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