Study of hydrogen permeation in (La _(5/6)Nd _(1/6)) _(5.5)WO _(12-δ) membranes (Conference Paper)

摘要

This work presents the preparation and characterization of the hydrogen permeation of a mixed protonic-electronic conducting membrane based on the doped system La _6WO _(12), in this instance, (La _(5/6)Nd _(1/6)) _(5.5)WO _(12-δ). The tungstates Ln _6WO _(12) present sufficient protonic and electronic mixed conductivity and stability in moist CO _2 environments and are potential candidates for the separation of hydrogen at high temperatures. Hydrogen separation properties of (La _(5/6)Nd _(1/6)) _(5.5)WO _(12-δ) were systematically analyzed, specifically, the influence of the H _2 concentration in feed stream, humidification degree and operating temperature on the hydrogen separation were studied. The best permeation results were achieved when both membrane sides were humidified (2.5 vol.% H _2O), i.e., the highest hydrogen flux was 0.046 mL min ~(-1)cm ~(- 2) at 1000 °C for membrane thickness of 0.9 mm.