Abstract
Dense Bi 1.5− x Y 0.5Cu x O 3− δ membranes in fluorite phase (δ phase) with different CuO concentration ( x = 0.005–0.015) and thickness (1–3 mm) were prepared from corresponding powders synthesized by the citrate method. Oxygen permeation through these membranes was studied using a high-temperature permeation system to examine the oxygen transport mechanism of the membranes. The oxygen permeation fluxes through these membranes (2 mm thick) at 800°C are in the range (5.0–9.2) × 10 −9 mol/cm 2 s at P′ O 2 of 0.21 atm and P″ O 2 of 5 × 10 −4–1 × 10 −3 atm. The permeation flux is inversely proportional to the membrane thickness, indicating bulk diffusion being the rate-limiting step. The driving force for the oxygen permeation through the membranes is ( P″ O 2 − 1 4 − P′ O 2 − 1 4 ). The activation energy for oxygen permeation is 136, 113 and 80 kJ/mol for the membranes with 0.25, 0.5, and 0.75 mol% CuO concentration, respectively.
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