Deakin University
Browse

File(s) under permanent embargo

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

journal contribution
posted on 2016-04-01, 00:00 authored by H Song, Shuaifei ZhaoShuaifei Zhao, J Chen, H Qi
© 2016 Elsevier Inc. All rights reserved. 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.

History

Journal

Microporous and Mesoporous Materials

Volume

224

Pagination

277-284

Location

Piscataway, N.J.

ISSN

1387-1811

eISSN

1873-3093

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Publisher

ELSEVIER SCIENCE BV