A new CO2-resistant Ruddlesden-Popper oxide with superior oxygen transport: A-site deficient (Pr0.9La0.1)1.9(Ni0.74Cu0.21Ga0.05)O4+δ

Jian Xue, Qing Liao, Wei Chen, Henricus J.M. Bouwmeester, Haihui Wang, Armin Feldhoff

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31 Citations (Scopus)

Abstract

A-site deficient (Pr0.9La0.1)1.9Ni0.74Cu0.21Ga0.05O4+d ((PL)1.9NCG), with the K2NiF4 structure, is found to exhibit higher oxygen transport rates compared with its cation-stoichiometric parent phase. A stable oxygen permeation flux of 4.6 10 7 mol cm 2 s 1 at 900 C at a membrane thickness of 0.6 mm is measured, using either helium or pure CO2 as sweep gas at a flow rate of 30 mL min 1. The oxygen flux is more than two times higher than that observed through A-site stoichiometric (PL)2.0NCG membranes operated under similar conditions. The high oxygen transport rates found for (PL)1.9NCG are attributed to highly mobile oxygen vacancies, compensating A-site deficiency. The high stability against carbonation gives (PL)1.9NCG potential for use, e.g., as a membrane in oxy-fuel combustion processes with CO2 capture.
Original languageEnglish
Pages (from-to)19107-19114
JournalJournal of materials chemistry. A
Volume3
Issue number37
DOIs
Publication statusPublished - 2015

Keywords

  • METIS-315949
  • IR-99492

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