SiAlC gas separation membranes derived from polydimethylsilane and aluminum acetylacetonate

• Published in: Journal of membrane science Vol. 192; no. 1; pp. 209 - 216
• Main Authors: Chao, Chih-Chiang, Tsai, Dah-Shyang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2001
• Subjects: Gas separations; Inorganic membranes; Microporous and porous membranes; Polydimethylsilane; Pore structure; Gas separations; Polydimethylsilane; Pore structure; Inorganic membranes; Microporous and porous membranes
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/S0376-7388(01)00505-1

An inorganic SiAlC membrane is synthesized from pyrolyzing a polymeric precursor of polydimethylsilane and aluminum acetylacetonate supported on an alumina tube. The PMS+10% Al-AcAc membrane, 773 K pyrolyzed, exhibits a hydrogen permeance 1.99×10 −9 mol Pa −1 s −1 m −2, H 2/N 2 selectivity 4.77, H 2/ i-C 4H 10 selectivity 26.3 at room temperature, and H 2 permeance 6.57×10 −9 mol Pa −1 s −1 m −2, H 2/N 2 selectivity 4.80, H 2/ i-C 4H 10 selectivity 7.20 at 473 K. For the membrane pyrolyzed under a high temperature, its gas permeance is generally lower than those pyrolyzed at low temperatures due to pore sintering. Variations of permeation properties with respect to pyrolysis temperature could be interpreted from BET, infrared, and TGA/DTA data on PMS+Al-AcAc pyrolyzed residues.