4.7 Article

Stability of ceramic materials for H2 transport membranes in gasification environment under the influence of gas contaminants

Journal

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 36, Issue 14, Pages 3457-3464

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2016.05.021

Keywords

Hydrogen transport membrane; Gas separation; Perovskite; Barium zirconate; Lanthanum tungstate

Funding

  1. Initiative and Networking Fund of the Helmholtz Association (HGF) through the Helmholtz-Alberta Initiative
  2. Bundesministerium of Wirtschaft and Energie through the HotVeGas project [FKZ 0327773]

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Mixed protonic-electronic conducting membrane materials offer an alternative method for separating hydrogen from carbon dioxide after the water-gas shift reaction. However, the membrane materials need to be tested for thermochemical stability at challenging operating conditions. BaCe0.5Zr0.4Y0.1O3-delta, BaCe0.2Zr0.7Yb0.08Ni0.02O3-delta, and La5.5WO12-delta were exposed to gas atmospheres containing contaminants like H2S, HCl, KCl, KOH, NaCl, and NaOH. The gas composition of the carrier gas flow simulates the atmospheres before and after the water-gas shift reaction. Sintered samples were exposed at 600 degrees C and 900 degrees C and subsequently analyzed by SEM/EDX and powder-XRD. Afterwards the samples were exposed at 900 degrees C in powder form and then characterized with XRD. Lanthanum tungstate showed very stable behavior for all contaminants. Barium zirconates tended to form chlorine compounds, especially BaCe0.5Zr0.4Y0.1O3-delta. BaCe0.2Zr0.7Yb0.08Ni0.02O3-delta on the other hand showed much more stability, but sustained intergranular corrosion with higher temperatures and syngas conditions when the atmosphere contained potassium. (C) 2016 Published by Elsevier Ltd.

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