In Situ Synthesis of Cation-Free Zirconia-Supported Zeolite CHA Membranes for Efficient CO2/CH4 Separation

Nana Wang, Guiliu Dang, Zhenwei Bai, Qing Wang, Bo Liu, Rongfei Zhou, Weihong Xing

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Cation-free zirconosilicate zeolite CHA and thin zirconia-supported membranes were in situ synthesized in a fluoride-free gel for the first time. The usage of the ZrO2/Al2O3 composite support inhibited the transportation of aluminum from the support into zeolite membranes. No fluorite source was used for the synthesis of cation-free zeolite CHA membranes, indicating the green property of the synthesis. The thickness of the membrane was only 1.0 μm. The best cation-free zeolite CHA membrane prepared by the green in situ synthesis displayed a high CO2 permeance of 1.1 × 10-6 mol/(m2 s Pa) and CO2/CH4 selectivity of 79 at 298 K and 0.2 MPa pressure drop for an equimolar CO2/CH4 mixture.

Original languageEnglish
Pages (from-to)16853-16864
Number of pages12
JournalACS Applied Materials and Interfaces
Volume15
Issue number13
DOIs
StatePublished - 5 Apr 2023

Keywords

  • CO capture
  • Si-CHA
  • in situ synthesis
  • natural gas sweetening
  • zeolite membranes

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