Silver bonded to silica gel applied to the separation of polycyclic aromatic sulfur heterocycles in heavy gas oil.
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 N2adsorption-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.
"PGCIMAT"-Instituto de Química, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil.
Thiago R
TR
Bjerk
"PGCIMAT"-Instituto de Química, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil.
Eliana W
EW
de Menezes
Instituto de Física, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil.
Marcelo B
MB
Pereira
"PGCIMAT"-Instituto de Química, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil; ITP, UNIT, CEP49032-490 Aracaju, SE, Brazil; INCT-E&A, Instituto Nacional de Ciência e Tecnologia em Energia e Meio Ambiente, CEP 40170-115 Salvador, BA, Brazil.
Elina B
EB
Caramão
"PGCIMAT"-Instituto de Química, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil. Electronic address: benvenutti@iq.ufrgs.br.
Edilson V
EV
Benvenutti
"PGCIMAT"-Instituto de Química, UFRGS, CEP 91501-970 Porto Alegre, RS, Brazil; INCT-E&A, Instituto Nacional de Ciência e Tecnologia em Energia e Meio Ambiente, CEP 40170-115 Salvador, BA, Brazil. Electronic address: claudialcaraz@gmail.com.
Cláudia A
CA
Zini
D005591:Chemical Fractionation; D005648:Fuel Oils / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D010165:Palladium / Q000737:chemistry*; D058428:Silica Gel / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013876:Thiophenes / Q000302:isolation & purification*
D005648:Fuel Oils; D013438:Sulfhydryl Compounds; D013876:Thiophenes; D012834:Silver; D010165:Palladium; D058428:Silica Gel
Comprehensive two-dimensional gas chromatography; GC×GC; Heavy gas oil; Ligand exchange chromatography; Organic sulfur compounds; Silver ion silica gel