Ryu, JH Lee, H Kim, YJ Kang, YS Kim, HS 2024-01-21T12:33:34Z 2024-01-21T12:33:34Z 2021-09-04 2001-04-01 0947-6539 https://pubs.kist.re.kr/handle/201004/140536 The highly selective dry complex membrane AgBF4-cellulose acetate (CA) was prepared and tested for the separation of ethylene/ethane and propylene/propane mixtures. The maximum selectivity Cor olefin over paraffin was found to be 280 for the ethylene/ ethane mixture and 200 for the propylene/propane mixture. Solid-state interactions of AgBF4 with cellulose acetate (CA) and/or olefins have been investigated by using FT-IR, UV, and X-ray photoelectron spectroscopy (XPS). FT-IR and XPS studies clearly show that the silver ions are coordinated by carbonyl oxygen atoms among three different types of oxygen atoms present in CA - two in thc acetate group and one in the ether linkage. Upon incorporation of AgBF4 into CA, the carbonyl stretching frequency of the free cellulose acetate at 1750 cm(-1) shifts to a lower frequency by about 41 cm(-1). The binding energy corresponding to a carbonyl oxygen atom in the O 1s XPS spectrum shifts to a more positive binding energy by the incorporation of AgBF4. Reversible olefin coordination to silver ions has been observed by FT-IR and UV studies. Treat ment of the AgBF4-CA membrane placed in a gas cell with propylene produces a propylene-coordinated membrane in which coordinated propylene is easily replaced by other olefins such as 1,3-butadiene. English WILEY-V C H VERLAG GMBH COMPLEX MEMBRANES SEPARATION SALTS PROPYLENE KINETICS Facilitated olefin transport by reversible olefin coordination to silver ions in a dry cellulose acetate membrane Article 10.1002/1521-3765(20010401)7:7<1525::AID-CHEM1525>3.0.CO;2-U 1 CHEMISTRY-A EUROPEAN JOURNAL, v.7, no.7, pp.1525 - 1529 CHEMISTRY-A EUROPEAN JOURNAL 7 7 1525 1529 scie scopus 000167983700021 2-s2.0-0035312902 Chemistry, Multidisciplinary Chemistry Article COMPLEX MEMBRANES SEPARATION SALTS PROPYLENE KINETICS cellulose acetate facilitated transport IR spectroscopy membranes silver