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Preparation and Properties of Hydrothermally Stable γ‐Alumina‐Based Composite Mesoporous Membranes
Author(s) -
Zahir Md. Hasan,
Sato Koji,
Mori Hiroshi,
Iwamoto Yuji,
Nomura Mikihiro,
Nakao Shinichi
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01165.x
Subject(s) - mesoporous material , dopant , hydrothermal circulation , materials science , permeance , chemical engineering , membrane , thermal stability , permeation , oxide , doping , chemistry , metallurgy , organic chemistry , catalysis , biochemistry , optoelectronics , engineering
We report here on our thermal and hydrothermal investigations comparing mesoporous γ‐Al 2 O 3 membrane with single and double dopant membranes prepared by the sol–gel method. Improvements in the hydrothermal stability of mesoporous γ‐Al 2 O 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 2 O 3 oxide used varied between 0.0 and 30 mol% and those of La 2 O 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 2 O 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.