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Pd-YSZ cermet membranes with self-repairing capability in extreme H2S conditions

Pd-YSZ cermet membranes with self-repairing capability in extreme H2S conditions
Jeon, SY[Jeon, Sang-Yun]Singh, B[Singh, Bhupendra]Im, HN[Im, Ha-Ni]Lee, KT[Lee, Kang-Taek]Song, SJ[Song, Sun-Ju]
DGIST Authors
Lee, KT[Lee, Kang-Taek]
Issued Date
Article Type
Ambipolar DiffusionCermetsCoupled OperationGas Permeable MembranesH2S ToleranceHydrogen ProductionHydrogen SeparationHydrogen Separation MembranesMembrane SurfaceMembranesPd-YSZ Cermet Hydrogen Separation MembraneRepairSelf-Repairing CapabilitySelf RepairingSeparationSulfur DioxideSulfur ToleranceSurface DiffusionSurface SegregationWater-SplittingYttria Stabilized Zirconia
A Pd-YSZ cermet membrane that performs coupled operations of hydrogen separation from a mixed-gas stream and simultaneous hydrogen production by non-galvanic water-splitting, and have high sulfur tolerance is fabricated. It is proved that in H2S containing atmosphere the Pd-YSZ membrane has self-repairing capability, originating mainly from the conversion of Pd4S back to metallic Pd and SO2 by ambipolar-diffused oxygen obtained from water-splitting. The performance of membrane was analyzed at different temperatures in high H2S containing (0–4000 ppm H2S) mixed gas feed during the operation as a hydrogen separation membrane as well as during the coupled operation of hydrogen separation and hydrogen production. At 900 °C with the feed-stream having ≥2000 ppm H2S, the hydrogen flux was severely affected due to the formation of some liquid phase of Pd4S, resulting in the segregation of hydrogen permeating Pd-phase at the membrane surface. But at 800 °C, though the membrane was affected by the Pd4S formation in high H2S environment (up to 1200 ppm H2S), its self-repairing capability and additional hydrogen production by water-splitting is capable of maintaining the hydrogen flux around ~1.24 cm3 (STP)/min.cm2, a value expected by the same membrane while performing only the hydrogen separation function in H2S-free environment. © 2016 Elsevier Ltd and Techna Group S.r.l.
Elsevier Ltd
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Department of Energy Science and Engineering AECSL(Advanced Energy Conversion and Storage Lab) 1. Journal Articles


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