Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5136041 | Journal of Chromatography A | 2016 | 7 Pages |
â¢Ag-MPSG material was characterized and used in LEC to separate PASH of HGO.â¢Ag-MPSG is a promising phase to replace Pd-MPSG due to its performance and lower cost.â¢Fractionation of HGO with Ag-MPSG followed by GC Ã GC/MS resulted in 168 OSC identified.â¢The use of Ag-MPSG resulted in the identification of some OSC not yet reported in HGO.
Silica gel containing silver ions was prepared and characterized. Silica was organofunctionalized with 3-mercaptopropyl group by using grafting reaction followed by silver ions adsorption (silver covalently bonded to mercaptopropyl silca gel, Ag-MPSG). The organofunctionalization and silver coordination were observed by transmission infrared spectroscopy and elemental analyses (CHN and EDS). The textural characteristics were studied by N2 adsorption-desorption isotherms. Additionally, optical properties were studied by diffuse reflectance spectroscopy. The Ag-MPSG material was employed as stationary phase for the first time for fractionation of a heavy gas oil sample resulting in a fraction that is richer in polycyclic aromatic sulfur heterocycles (PASH). The fractions were analyzed by comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometric detector and Ag-MPSG material provided similar fractionation performance when compared to conventional material [palladium covalently bonded to mercaptopropyl silca gel, Pd(II)-MPSG] usually employed for the same purpose and as the cost of silver is less than the one of palladium, the cost of the fractionation phase was reduced.