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A Hydrogen‐Permselective Silicon Oxycarbide Membrane Derived from Polydimethylsilane
Author(s) -
Lee LangLuen,
Tsai DahShyang
Publication year - 1999
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.1151-2916.1999.tb02158.x
Subject(s) - permeance , microporous material , membrane , pyrolysis , selectivity , permeation , chemical engineering , diffusion , materials science , chemistry , hydrogen , nuclear chemistry , organic chemistry , catalysis , thermodynamics , engineering , biochemistry , physics
A novel microporous membrane has been prepared by modifying an asymmetric SiC support using polydimethylsilane (PMS). One membrane, pyrolyzed at 573 K, possesses H 2 /N 2 selectivity of ∼100 and H 2 permeance of 8.9 × 10 −8 mol·m −2 ·s −1 ·Pa −1 at 473 K. The other membrane, pyrolyzed at 873 K, has a lower H 2 /N 2 selectivity of ∼40 and lower H 2 permeance of 4.9 × 10 −9 mol·m −2 ·s −1 ·Pa −1 at 473 K. Permeation in both membranes exhibits the characteristics of activated diffusion at elevated temperatures. A higher pyrolysis temperature results in a less‐permeable membrane. The support preparation and the thermal events of PMS are analyzed. The effects of pyrolysis temperature on membrane property are discussed.