Facilitated olefin transport by reversible olefin coordination to silver ions in a dry cellulose acetate membrane
- Authors
- Ryu, JH; Lee, H; Kim, YJ; Kang, YS; Kim, HS
- Issue Date
- 2001-04-01
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- CHEMISTRY-A EUROPEAN JOURNAL, v.7, no.7, pp.1525 - 1529
- Abstract
- 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.
- Keywords
- COMPLEX MEMBRANES; SEPARATION; SALTS; PROPYLENE; KINETICS; COMPLEX MEMBRANES; SEPARATION; SALTS; PROPYLENE; KINETICS; cellulose acetate; facilitated transport; IR spectroscopy; membranes; silver
- ISSN
- 0947-6539
- URI
- https://pubs.kist.re.kr/handle/201004/140536
- DOI
- 10.1002/1521-3765(20010401)7:7<1525::AID-CHEM1525>3.0.CO;2-U
- Appears in Collections:
- KIST Article > 2001
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