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Preparation of Asymmetric Tubular Oxygen Separation Membrane with Oxygen Permeable Pr 2 Ni 0.75 Cu 0.25 Ga 0.05 O 4+δ
Author(s) -
Choi MoonBong,
Song SunJu,
Lee TaeWon,
Yoo HanIll,
Lee UenDo,
Bang ByeongRyeol
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02507.x
Subject(s) - materials science , microporous material , porosity , tape casting , composite material , membrane , permeation , slurry , sintering , casting , oxygen , electrolyte , layer (electronics) , suspension (topology) , electrode , chemical engineering , chemistry , organic chemistry , engineering , biology , genetics , mathematics , homotopy , pure mathematics
The electrical conductivities and oxygen permeation properties of Pr 2 Ni 0.75 Cu 0.25 Ga 0.05 O 4+δ were measured by conventional DC four‐probe method with Pt electrode and gas chromatography. The total conductivities increased with an apparent slope of 1/6, satisfied by the charge neutrality condition at the p ‐type regime of . A tubular‐type, asymmetric, mixed‐conducting oxygen separation membrane was fabricated by drain casting method. A microporous, ceramic support was prepared by slurry processing, because the use of a slurry technique and a suspension of dispersed particles provides a lower final porosity and a more homogeneous particle packing than dry‐pressing does. The 30 cm long, tubular, porous alumina with a soft surface was successfully prepared by drain casting. The surface SEM images revealed a structure with reasonable porosity and well‐necked particles. A mixed‐conducting layer of Pr 2 Ni 0.75 Cu 0.25 Ga 0.05 O 4+δ was applied inside of the support tube by drain casting. A dense separation layer was successfully fabricated inside the porous alumina tube by sintering at 1473 K for 8 h in air.