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Microwave‐heating Synthesis and Gas Separation Performance of NaA Zeolite Membrane
Author(s) -
Cheng ZhiLin,
Liu Zan,
Wan HuiLin
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590007
Subject(s) - selectivity , chemistry , knudsen diffusion , membrane , zeolite , hydrothermal synthesis , diffusion , knudsen number , chemical engineering , substrate (aquarium) , microwave , analytical chemistry (journal) , chromatography , organic chemistry , catalysis , hydrothermal circulation , thermodynamics , biochemistry , physics , oceanography , quantum mechanics , geology , engineering
The paper presented novel synthesis of NaA zeolite membrane with good performance using microwave heating. The method involved two steps, prior seeding 120 nm of LTA crystals on substrate and then employing a secondary hydrothermal synthesis. Effects of seeding times, synthesis time and synthesis times were investigated in this work. The quality evaluation of membranes respectively used single component gases (H 2 and N 2 ) and H 2 /N 2 (equivalent volume) mixture. The ideal H 2 /N 2 selectivity increased from 1.90 of the substrate to 6.37 of the three‐stage synthesized membrane, which was distinctly higher than the corresponding Knudsen diffusion selectivity of 3.74. However, the real H 2 /N 2 selectivity of the three‐stage synthesis was much lower than the corresponding ideal selectivity and close to the corresponding Knudsen diffusion selectivity of 3.74.