Hydrogen purification through dual-phase oxygen permeable membrane with excellent stability.

Hydrogen purification through dual-phase oxygen permeable membrane with excellent stability.
Angew Chem Int Ed Engl. 2020 Sep 14;:
Authors: Jia J, He G, Zhang Y, Caro J, Jiang H
Abstract
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 membrane. Pure hydrogen can be obtained on the water splitting side after condensation. However, the existing Co- and Fe-based OPMs are chemically unstable due to the over-reduction of Co and Fe ions under reducing atmospheres. Herein, 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 ºC. 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.
PMID: 32924212 [PubMed - as supplied by publisher]

Source: Angewandte Chemie - September 13, 2020 Category: Chemistry Authors: Jia J, He G, Zhang Y, Caro J, Jiang H Tags: Angew Chem Int Ed Engl Source Type: research