Novel CO₂-tolerant Al-containing membranes for high-temperature oxygen separation

authored by

Kaveh Partovi, Michael Bittner, Jürgen Caro

Abstract

Novel dual-phase oxygen-transporting membranes with compositions 40 wt% Nd_0.6Sr_0.4Al_0.2Fe_0.8O_3-δ-60 wt% Ce_0.9Nd_0.1O_2-δ (NSAF6428-CN91) and 40 wt% Nd_0.5Sr_0.5Al_0.2Fe_0.8O_3-δ-60 wt% Ce_0.8Nd_0.2O_2-δ (NSAF5528-CN82) were successfully synthesized via a one-pot sol-gel method. The oxygen permeation performance and the structural properties of the membranes could be simultaneously improved owing to Al doping of the perovskite phase. The newly developed dense ceramic membranes (0.6 mm thick) displayed long-term stable oxygen permeation fluxes of 0.31 and 0.51 cm³ min^-1 cm^-2 under an air/CO₂ oxygen partial pressure gradient at 950 °C for NSAF6428-CN91 and NSAF5528-CN82, respectively. The NSAF6428-CN91 showed a stable oxygen flux of 0.15 cm³ min^-1 cm^-2 at 900 °C for 100 h, without any deterioration of the microstructure under pure CO₂ sweeping.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

Type

Article

Journal

Journal of Materials Chemistry A

Volume

3

Pages

24008-24015

No. of pages

8

ISSN

2050-7488

Publication date

21.12.2015

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Chemistry, Renewable Energy, Sustainability and the Environment, General Materials Science

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1039/c5ta04405g (Access: Closed)