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

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• 作者：Emanuel Forster ; ^{e.forster@fz-juelich.de" class="auth_mail" title="E-mail the corresponding author} ; Dé ; siré ; e van Holt ; Mariya E. Ivanova ; Stefan Baumann ; Wilhelm A. Meulenberg ; Michael Mü ; ller
• 关键词：Hydrogen transport membrane ; Gas separation ; Perovskite ; Barium zirconate ; Lanthanum tungstate
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：36
• 期：14
• 页码：3457-3464
• 全文大小：2868 K

文摘

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. BaCe_0.5Zr_0.4Y_0.1O_3 − δ, BaCe_0.2Zr_0.7Yb_0.08Ni_0.02O_3 − δ, and La_5.5WO_12 − δ 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 °C and 900 °C and subsequently analyzed by SEM/EDX and powder-XRD. Afterwards the samples were exposed at 900 °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 BaCe_0.5Zr_0.4Y_0.1O_3 − δ. BaCe_0.2Zr_0.7Yb_0.08Ni_0.02O_3 − δ on the other hand showed much more stability, but sustained intergranular corrosion with higher temperatures and syngas conditions when the atmosphere contained potassium.