Effect of silver($\mathrm{I}$) ion reduction on the selectivity of olefins, paraffins, and aromatic compounds by gas chromatographic stationary phases consisting of silver($\mathrm{I}$) salts in ionic liquids

Eor, Philip; Tryon-Tasson, Nicholas; Anderson, Jared L.

doi:10.1016/j.chroma.2022.463757

Effect of silver($$\mathrm{I}$$) ion reduction on the selectivity of olefins, paraffins, and aromatic compounds by gas chromatographic stationary phases consisting of silver($$\mathrm{I}$$) salts in ionic liquids

Journal Article · Sat Dec 24 00:00:00 EST 2022 · Journal of Chromatography

DOI:https://doi.org/10.1016/j.chroma.2022.463757· OSTI ID:1908937

Eor, Philip ^[1]; ^[1]; ^[1]

Ames Laboratory, and Iowa State University, Ames, IA (United States)

We report the olefin/paraffin selectivity offered by ionic liquid (IL) stationary phases can be enhanced through the addition of silver(I) ion, which is well-known to undergo selective complexation with unsaturated compounds. However, such stationary phases often suffer from the loss of chromatographic selectivity as silver(I) ion can be reduced to elemental silver. To maintain the separation performance of silver(I) ion/IL stationary phases, an understanding of factors and conditions that promote the reduction of silver(I) ion is needed. In this study, capillary gas chromatography columns featuring a stationary phase consisting of the 1-decyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C₁₀MIM⁺][NTf₂^-]) IL impregnated with [Ag⁺][NTf₂^-] were examined to investigate the effects of temperature, hydrogen content in exposure gas stream, and time of heating/exposure events on olefin selectivity. Retention factors of representative analytes, such as C₆ olefins and paraffins as well as aromatic compounds, were measured after subjecting the columns to the aforementioned conditions, followed by an evaluation of selectivity factors over time. Selectivity factors of olefins and aromatic compounds were observed to decrease significantly when the stationary phases were heated to temperatures higher than 110°C as well as being subjected to mixed gas streams containing greater than 50 mol% of hydrogen. As constant column heating temperatures were applied under exposure gas mixtures containing hydrogen and nitrogen, a gradual decrease in analyte selectivity factors was observed under prolonged periods of time. However, application of a ternary gas mixture comprised of 25/50/25 mol% hydrogen/nitrogen/methane resulted in an increase in the 3-hexyne/cis-2-hexene selectivity when measured at 120°C for 60 h, due to a smaller decrease in the retention factor of 3-hexyne compared to cis-2-hexene.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1908937

Report Number(s):: IS-J-10,980

Journal Information:: Journal of Chromatography, Journal Name: Journal of Chromatography Vol. 1689; ISSN 0021-9673

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Effect of silver($$\mathrm{I}$$) ion reduction on the selectivity of olefins, paraffins, and aromatic compounds by gas chromatographic stationary phases consisting of silver($$\mathrm{I}$$) salts in ionic liquids

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