Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 4, Pages 4145-4151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20151
Keywords
FAU; zeolite; membrane; gas separation; ethylene; propylene
Funding
- JST CREST (Japan Science and Technology agency, Create REvolutionary technological seeds for Science and Technology innovation program), Japan [JPMJCR1324]
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Propylene/propane and ethylene/ethane separation was examined with Ag-exchanged X-type zeolite membrane (Ag-X membrane). The Na-X membrane was prepared on a porous tubular alpha-alumina support by a secondary growth method. The resulting Na-X membrane was ion-exchanged by using AgNO3 aq. Olefin selectivities in both mixtures were markedly improved after the ion exchange from Na to Ag cation. The Ag-X membrane exhibited a maximum propylene selectivity of 55.4 with a permeance of 4.13 X 10(-8) mol m(-2) s(-1) Pa-1 at 353 K for a propylene/propane (50:50) mixture. This membrane also exhibited a maximum ethylene selectivity of 15.9 with a permeance of 9.04 X 10(-8) mol m(-2) s(-1) Pa-1 at 303 K for an ethylene/ethane (50:50) mixture. We consider that the strong interaction between olefin and Ag cation plays an important role for the appearance of such high selectivity of olefin.
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