We report here on our thermal and hydrothermal investigations comparing mesoporous γ-Al 2O 3 membrane with single and double dopant membranes prepared by the sol-gel method. Improvements in the hydrothermal stability of mesoporous γ-Al 2O 3 by transition (Ga 3+) or rare-earth (La 3+) cations are discussed, along with the effectiveness of double dopant (Ga 3+- La 3+). The amounts of Ga 2O 3 oxide used varied between 0.0 and 30 mol% and those of La 2O 3 between 6 and 15 mol%. The thermal and hydrothermal (up to 75% steam) stability of nine types of membranes fabricated on an asymmetric porous α-Al 2O 3 support by means of a dip-coating process was characterized by H 2 gas permeation at 500°C. By conducting tests with wide variations in dopant concentrations, material characterizations, and gas permeance performance, we have been able to optimize the key parameters for hydrothermally stable systems.
ASJC Scopus subject areas
- Ceramics and Composites