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Hydrogen Purification through a Highly Stable Dual‐Phase Oxygen‐Permeable Membrane
Author(s) -
Jia Lujian,
He Guanghu,
Zhang Yan,
Caro Jürgen,
Jiang Heqing
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202010184
Subject(s) - hydrogen , oxygen , membrane , conductivity , chemistry , chemical engineering , hydrogen production , materials science , hydrogen purifier , inorganic chemistry , organic chemistry , biochemistry , engineering
Using oxygen permeable membranes (OPMs) to upgrade low‐purity hydrogen is a promising concept for high‐purity H 2 production. At high temperatures, water dissociates into hydrogen and oxygen. The oxygen permeates through OPM and oxidizes hydrogen in a waste stream on the other side of the membrane. Pure hydrogen can be obtained on the water‐splitting side after condensation. However, the existing Co‐ and Fe‐based OPMs are chemically instable as a result of the over‐reduction of Co and Fe ions under reducing atmospheres. Herein, a dual‐phase membrane Ce 0.9 Pr 0.1 O 2−δ ‐Pr 0.1 Sr 0.9 Mg 0.1 Ti 0.9 O 3−δ (CPO‐PSM‐Ti) with excellent chemical stability and mixed oxygen ionic‐electronic conductivity under reducing atmospheres was developed for H 2 purification. An acceptable H 2 production rate of 0.52 mL min −1 cm −2 is achieved at 940 °C. No obvious degradation during 180 h of operation indicates the robust stability of CPO‐PSM‐Ti membrane. The proven mixed conductivity and excellent stability of CPO‐PSM‐Ti give prospective advantages over existing OPMs for upgrading low‐purity hydrogen.