Organic template-free synthesis of high-quality CHA type zeolite membranes for carbon dioxide separation

Eunhee Jang, Sungwon Hong, Eunjoo Kim, Nakwon Choi, Sung June Cho, Jungkyu Choi

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Microporous chabazite (CHA) zeolite is very promising for CO2 capture because of its appropriate pores with molecular dimensions for the preferential adsorption of CO2 molecules. Herein, CHA type zeolite particles and membranes were prepared by using a seeded growth method in the absence of an organic structure directing agent (OSDA) or template. After substantial effort to find appropriate and reliable conditions for obtaining continuous CHA type zeolite membranes, it was recognized that the formation of these membranes is a highly sensitive function of the Si/Al ratio in the synthetic precursor. Using the appropriate Si/Al ratio of ~50, OSDA-free CHA type zeolite membranes were manufactured with high reproducibility. The resulting OSDA-free CHA type zeolite membranes showed maximum CO2/N2 and CO2/CH4 separation factors of ~12.5 ± 3.8 and ~28.8 ± 6.9, respectively, with a moderate CO2 permeance of ~1 × 10−7 mol m−2 s−1 Pa−1. Notably, under more realistic wet conditions (i.e., in the presence of H2O vapor), the separation performance at temperatures above 75 °C was comparable to that obtained under dry conditions, although permeation was hindered below 50 °C, apparently due to the strong adsorption of H2O vapor.

Original languageEnglish
Pages (from-to)46-59
Number of pages14
JournalJournal of Membrane Science
Volume549
DOIs
Publication statusPublished - 2018 Mar 1

Bibliographical note

Funding Information:
This work was supported by the Korea CCS R&D Center (KCRC) ( 2014M1A8A1049309 ), by the International Research & Development Program ( 2016K1A3A1A48954031 ), and by the Super Ultra Low Energy and Emission Vehicle ( SULEEV ) Engineering Research Center ( 2016R1A5A1009592 ) through National Research Foundation (NRF) of Korea. These grants were funded by the Korea government ( Ministry of Science and ICT ). In addition, this research was supported by Korea University Future Research Grant. A part of SEM characterizations was carried out at the Korea Basic Science Institute (KBSI).

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • Carbon dioxide separation
  • Chabazite zeolites
  • Cracks
  • Seeded or secondary growth
  • Template-free synthesis

ASJC Scopus subject areas

  • Biochemistry
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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