Skip to content

Research at St Andrews

Cation control of molecular sieving by flexible Li-containing zeolite Rho

Research output: Research - peer-reviewArticle


Open Access permissions



Magdalena Lozinska, Enzo Mangano, Alexander Greenaway, Robin Fletcher, Stephen Thompson, Claire Murray, Stefano Brandani, Paul Anthony Wright

School/Research organisations


The adsorption of CO2 on zeolite Li-Rho (unit cell composition Li9.8Al9.8Si38.2O96) has been investigated by the measurement of adsorption isotherms (273–300 K), breakthrough curves with a CO2/CH4/He mixture (308 K), and in situ synchrotron X-ray powder diffraction in CO2 (298 K). The Rho framework distorts when in the Li-form to give a shape selective adsorbent for CO2 over CH4, although breakthrough curves reveal diffusional limitations. In situ synchrotron powder XRD follows the expansion of the Li-Rho unit cell upon adsorption, which remains single phase to a CO2 pressure of ca. 0.6 bar. Partial cation exchange of Li-Rho by Na+ or Cs+ gives two series of M,Li-Rho zeolites (M = Na, Cs). Where the occupancy of window sites (8R, D8R) between lta cages is less than 50%, hysteresis is not observed in CO2 isotherms at 298 K. For Cs1.8Li8-Rho, which has a larger unit cell and a wider window than zeolite Li-Rho due to the presence of large Cs+ cations in double 8-ring sites, breakthrough curves indicate faster CO2 diffusion without significant loss of selectivity. We propose this control of adsorption kinetics of the flexible zeolite Rho via modification of cation content as a mechanism for cation controlled molecular sieving.


Original languageEnglish
Pages (from-to)19652-19662
Number of pages11
JournalJournal of Physical Chemistry C
Issue number35
Early online date8 Aug 2016
StatePublished - 8 Sep 2016

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. High performance mixed matrix membranes (MMMs) composed of ZIF-94 filler and 6FDA-DAM polymer

    Etxeberria-Benavides, M., David, O., Johnson, T., Łozińska, M. M., Orsi, A., Wright, P. A., Mastel, S., Hillenbrand, R., Kapteijn, F. & Gascon, J. 16 Dec 2017 In : Journal of Membrane Science. 550, p. 198-207

    Research output: Research - peer-reviewArticle

  2. Modulator-controlled synthesis of microporous STA-26, an interpenetrated 8,3-connected zirconium MOF with the the-i topology, and its reversible lattice shift

    Bumstead, A., Cordes, D. B., Dawson, D. M., Chakarova, K. K., Mihaylov, M. Y., Hobday, C. L., Düren, T., Hadjiivanov, K., Slawin, A. M. Z., Ashbrook, S. E., Prasad, R. R. R. & Wright, P. A. 25 Jan 2018 (Accepted/In press) In : Chemistry - A European Journal. In press

    Research output: Research - peer-reviewArticle

  3. Reactions of dimethylether in single crystals of the silicoaluminophosphate STA-7 studied via Operando synchrotron infrared microspectroscopy

    Howe, R. F., Suwardiyanto, Price, D. J., Castro, M., Wright, P. A., Greenaway, A., Frogley, M. D. & Cinque, G. 16 Jan 2018 In : Topics in Catalysis. 14 p.

    Research output: Research - peer-reviewArticle

  4. Tuning Pd-nanoparticle@MIL-101(Cr) catalysts for tandem reductive amination

    Anderson, A. E., Baddeley, C. J. & Wright, P. A. 27 Nov 2017 In : Catalysis Letters. In press

    Research output: Research - peer-reviewArticle

  5. Investigation of zeolitic imidazolate frameworks using 13C and 15N solid-state NMR spectroscopy

    Sneddon, S., Kahr, J., Orsi, A. F., Price, D. J., Dawson, D. M., Wright, P. A. & Ashbrook, S. E. Oct 2017 In : Solid State Nuclear Magnetic Resonance. 87, p. 54-64 11 p.

    Research output: Research - peer-reviewArticle

Related by journal

  1. CuSCN nanowires as electrodes for p-type quantum dot sensitized solar cells: charge transfer dynamics and alumina passivation

    Sajjad, M. T., Park, J., Gaboriau, D., Harwell, J. R., Odobel, F., Reiss, P., Samuel, I. D. W. & Aldakov, D. 13 Feb 2018 In : Journal of Physical Chemistry C.

    Research output: Research - peer-reviewArticle

  2. Charge separation and triplet exciton formation pathways in small molecule solar cells as studied by time-resolved EPR spectroscopy

    Thomson, S., Niklas, J., Mardis, K. L., Mallares, C., Samuel, I. D. W. & Poluektov, O. G. 19 Oct 2017 In : Journal of Physical Chemistry C. 121, 41, p. 22707-22719

    Research output: Research - peer-reviewArticle

  3. Quantum-enhanced capture of photons using optical ratchet states

    Higgins, K., Lovett, B. W. & Gauger, E. 28 Sep 2017 In : Journal of Physical Chemistry C. 121, 38, p. 20714–20719

    Research output: Research - peer-reviewArticle

  4. Determining the surface structure of silicated alumina catalysts via isotopic enrichment and dynamic nuclear polarization surface-enhanced NMR spectroscopy

    Rankin, A. G. M., Webb, P. B., Dawson, D. M., Viger-Gravel, J., Walder, B., Emsley, L. & Ashbrook, S. E. M. 27 Sep 2017 In : Journal of Physical Chemistry C. Just Accepted Manuscript

    Research output: Research - peer-reviewArticle

ID: 242396951