CO2 selective NaMg-CTS-1 and its structural formation from the titanium silicate based molecule sieve NaMg-ETS-4

Ocean Cheung, Jie Su, Zoltán Bacsik, Jing Li, Louise Samain, Xiaodong Zou, Niklas Hedin

Research output: Contribution to journalArticle

Abstract

A range of titanium silicates (ETS-4 and CTS-1) with interesting gas separation properties were studied as CO2 adsorbents. Some of these adsorbents, in particular NaMg-CTS-1, showed the ability to selectively adsorb CO2-over-N2. Partially exchanged NaM-ETS-4 (M = Mg, Ca, Sr and Ba) were synthesised in the Na+ form and ion exchanged with group 2 cations. All but NaBa-ETS-4 transformed into their CTS-1 counterparts, when these partially exchanged Na-ETS-4 were dehydrated. The transformation from ETS-4 to CTS-1 was monitored and studied extensively using diffraction and spectroscopic techniques. Powder X-ray diffraction allowed us to follow the changes of the unit cell parameters occurred at different temperatures. We combined high energy X-ray total scattering (analysed by pair distribution functions - PDF analysis), electron diffraction, infrared, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy to study the transformation of ETS-4 to CTS-1. We understood that under dehydration steps, there was significant disruption to the Ti-O-Ti chain along the b-axis, which occurred concurrently with the distortion of the double 3-rings alongside of these chains. These changes were partly responsible for the contraction of the ETS-4 framework (and successive transformation to CTS-1). The new information allowed us to understand the interesting structures and sorption properties of these adsorbents.
Original languageEnglish
Pages (from-to)63-73
Number of pages11
JournalMicroporous and Mesoporous Materials
Volume198
DOIs
Publication statusPublished - 1 Nov 2014

Fingerprint

Sieves
Adsorbents
Molecules
Dehydration
Electron diffraction
X ray powder diffraction
Nuclear magnetic resonance spectroscopy
Distribution functions
Cations
Sorption
Diffraction
Gases
Scattering
Ions
Infrared radiation
X rays
titanium silicide
Temperature

Keywords

  • ETS-4
  • Ion exchange
  • Structure determination
  • Titanium silicates

Cite this

Cheung, Ocean ; Su, Jie ; Bacsik, Zoltán ; Li, Jing ; Samain, Louise ; Zou, Xiaodong ; Hedin, Niklas. / CO2 selective NaMg-CTS-1 and its structural formation from the titanium silicate based molecule sieve NaMg-ETS-4. In: Microporous and Mesoporous Materials. 2014 ; Vol. 198. pp. 63-73.
@article{9f2903617638404592b5a04f3a4694ce,
title = "CO2 selective NaMg-CTS-1 and its structural formation from the titanium silicate based molecule sieve NaMg-ETS-4",
abstract = "A range of titanium silicates (ETS-4 and CTS-1) with interesting gas separation properties were studied as CO2 adsorbents. Some of these adsorbents, in particular NaMg-CTS-1, showed the ability to selectively adsorb CO2-over-N2. Partially exchanged NaM-ETS-4 (M = Mg, Ca, Sr and Ba) were synthesised in the Na+ form and ion exchanged with group 2 cations. All but NaBa-ETS-4 transformed into their CTS-1 counterparts, when these partially exchanged Na-ETS-4 were dehydrated. The transformation from ETS-4 to CTS-1 was monitored and studied extensively using diffraction and spectroscopic techniques. Powder X-ray diffraction allowed us to follow the changes of the unit cell parameters occurred at different temperatures. We combined high energy X-ray total scattering (analysed by pair distribution functions - PDF analysis), electron diffraction, infrared, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy to study the transformation of ETS-4 to CTS-1. We understood that under dehydration steps, there was significant disruption to the Ti-O-Ti chain along the b-axis, which occurred concurrently with the distortion of the double 3-rings alongside of these chains. These changes were partly responsible for the contraction of the ETS-4 framework (and successive transformation to CTS-1). The new information allowed us to understand the interesting structures and sorption properties of these adsorbents.",
keywords = "ETS-4, Ion exchange, Structure determination, Titanium silicates",
author = "Ocean Cheung and Jie Su and Zolt{\'a}n Bacsik and Jing Li and Louise Samain and Xiaodong Zou and Niklas Hedin",
year = "2014",
month = "11",
day = "1",
doi = "10.1016/j.micromeso.2014.07.017",
language = "English",
volume = "198",
pages = "63--73",
journal = "Microporous and Mesoporous Materials",
issn = "1387-1811",
publisher = "Elsevier",

}

CO2 selective NaMg-CTS-1 and its structural formation from the titanium silicate based molecule sieve NaMg-ETS-4. / Cheung, Ocean; Su, Jie; Bacsik, Zoltán; Li, Jing; Samain, Louise; Zou, Xiaodong; Hedin, Niklas.

In: Microporous and Mesoporous Materials, Vol. 198, 01.11.2014, p. 63-73.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CO2 selective NaMg-CTS-1 and its structural formation from the titanium silicate based molecule sieve NaMg-ETS-4

AU - Cheung, Ocean

AU - Su, Jie

AU - Bacsik, Zoltán

AU - Li, Jing

AU - Samain, Louise

AU - Zou, Xiaodong

AU - Hedin, Niklas

PY - 2014/11/1

Y1 - 2014/11/1

N2 - A range of titanium silicates (ETS-4 and CTS-1) with interesting gas separation properties were studied as CO2 adsorbents. Some of these adsorbents, in particular NaMg-CTS-1, showed the ability to selectively adsorb CO2-over-N2. Partially exchanged NaM-ETS-4 (M = Mg, Ca, Sr and Ba) were synthesised in the Na+ form and ion exchanged with group 2 cations. All but NaBa-ETS-4 transformed into their CTS-1 counterparts, when these partially exchanged Na-ETS-4 were dehydrated. The transformation from ETS-4 to CTS-1 was monitored and studied extensively using diffraction and spectroscopic techniques. Powder X-ray diffraction allowed us to follow the changes of the unit cell parameters occurred at different temperatures. We combined high energy X-ray total scattering (analysed by pair distribution functions - PDF analysis), electron diffraction, infrared, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy to study the transformation of ETS-4 to CTS-1. We understood that under dehydration steps, there was significant disruption to the Ti-O-Ti chain along the b-axis, which occurred concurrently with the distortion of the double 3-rings alongside of these chains. These changes were partly responsible for the contraction of the ETS-4 framework (and successive transformation to CTS-1). The new information allowed us to understand the interesting structures and sorption properties of these adsorbents.

AB - A range of titanium silicates (ETS-4 and CTS-1) with interesting gas separation properties were studied as CO2 adsorbents. Some of these adsorbents, in particular NaMg-CTS-1, showed the ability to selectively adsorb CO2-over-N2. Partially exchanged NaM-ETS-4 (M = Mg, Ca, Sr and Ba) were synthesised in the Na+ form and ion exchanged with group 2 cations. All but NaBa-ETS-4 transformed into their CTS-1 counterparts, when these partially exchanged Na-ETS-4 were dehydrated. The transformation from ETS-4 to CTS-1 was monitored and studied extensively using diffraction and spectroscopic techniques. Powder X-ray diffraction allowed us to follow the changes of the unit cell parameters occurred at different temperatures. We combined high energy X-ray total scattering (analysed by pair distribution functions - PDF analysis), electron diffraction, infrared, Raman and Nuclear Magnetic Resonance (NMR) spectroscopy to study the transformation of ETS-4 to CTS-1. We understood that under dehydration steps, there was significant disruption to the Ti-O-Ti chain along the b-axis, which occurred concurrently with the distortion of the double 3-rings alongside of these chains. These changes were partly responsible for the contraction of the ETS-4 framework (and successive transformation to CTS-1). The new information allowed us to understand the interesting structures and sorption properties of these adsorbents.

KW - ETS-4

KW - Ion exchange

KW - Structure determination

KW - Titanium silicates

UR - http://www.scopus.com/inward/record.url?scp=84905373708&partnerID=8YFLogxK

U2 - 10.1016/j.micromeso.2014.07.017

DO - 10.1016/j.micromeso.2014.07.017

M3 - Article

VL - 198

SP - 63

EP - 73

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

ER -