Hydrothermally stable Zr-doped organosilica membranes for H2/CO2 separation

Huating Song, Shuaifei Zhao*, Jiawei Chen, Hong Qi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Homogeneous zirconium-doped hybrid organosilica membranes are successfully prepared through the sol-gel route via co-hydrolysis and co-condensation of 1,2-bis(triethoxysilyl)ethane (BTESE) and zirconium n-propoxide (ZrP). Gas permeation measurements and hydrothermal stability tests are carried out for the prepared membranes. Smaller sols are more prone to form a dense structure and thus lead to low gas permeability. Hybrid organosilica membranes with low zirconium content have high hydrogen permeability and H2/CO2 selectivity. As zirconium content in the sol increases, membrane structure becomes denser and gas permeability decreases. Excellent hydrothermal stability can be achieved by incorporating Zr into the hybrid silica membranes. This is caused by the improved hydrophobicity due to the presence of hybrid organic-inorganic groups (-Si-CH2-CH2-Si-) and the dense, robust membrane structure that formed after zirconium-doping. A ball-and-stick model is proposed based on the characterization data. Our results offer significant insights into understanding the correlations between particles (e.g. size and distribution), structure (e.g. porosity and pore size) and performance (e.g. gas permeability and hydrothermal stability) of organosilica membranes.

    Original languageEnglish
    Pages (from-to)277-284
    Number of pages8
    JournalMicroporous and Mesoporous Materials
    Volume224
    DOIs
    Publication statusPublished - 1 Apr 2016

    Keywords

    • Hydrothermal stability
    • Metal doping
    • Hybrid silica
    • Microporous membrane
    • Gas separation

    Fingerprint Dive into the research topics of 'Hydrothermally stable Zr-doped organosilica membranes for H<sub>2</sub>/CO<sub>2</sub> separation'. Together they form a unique fingerprint.

    Cite this