Tuning the Selectivity of Ionic Liquid Stationary Phases for Enhanced Separation of Nonpolar Analytes in Kerosene Using Multidimensional Gas Chromatography

Author(s)

Hantao, Leandro W. ^{[1, 2]} ; Najafi, Ali ^[1] ; Zhang, Cheng ^[1] ; Augusto, Pabio ^[2] ; Anderson, Jared L. ^{[1, 3]}

Affiliation

^[1] Univ Toledo, Dept Chem, Toledo, OH 43606 - USA

^[2] Univ Estadual Campinas, Inst Chem, BR-13084970 Campinas, SP - Brazil

^[3] Univ Toledo, Sch Green Chem & Engn, Toledo, OH 43606 - USA

• Document type: Journal article
• Source: Analytical Chemistry; v. 86, n. 8, p. 3717-3721, APR 15 2014.
• Web of Science Citations: 29

Abstract

In this study, a series of ionic liquids (ILs) are evaluated as stationary phases in comprehensive two-dimensional gas chromatography (GC X GC) for the separation of aliphatic hydrocarbons from kerosene. IL-based stationary phases were carefully designed to evaluate the role of cavity formation/dispersive interaction on the chromatographic retention of nonpolar analytes by GC X GC. The maximum allowable operating temperature (MAOT) of the IL-based columns was compared to that of commercial IL-based columns. Evaluation of the solvation characteristics of GC columns guided the selection of the best performing IL-based stationary phases for the resolution of aliphatic hydrocarbons, namely, trihexyl(tetradecyl)phosphonium tetrachloroferrate ({[}P-66614]{[}FeCl4]) and trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)trifluorophosphate ({[}P-66614]{[}PAP]) ILs. The best performing {[}P-6614]{[}FeCl4] IL-based column exhibited a MAOT of 320 degrees C, higher than the commercial SUPELCOWAX 10 (MAOT of 280 degrees C) and commercial IL-based columns (MAOT up to 300 degrees C). The structurally tuned {[}P-66614]{[}FeCl4] IL stationary phase exhibited improved separation of aliphatic hydrocarbons by GC X GC compared to the commercial columns examined (e.g., OV-1701, SUPELCOWAX 10, SLB-IL60, SLB-IL100, and SLB-IL111). (AU)

• FAPESP's process: 12/22375-3 - Ionic liquid sorbent phases: synthesis, characterization and applications in GCxGC
• Grantee: Leandro Wang Hantao
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate