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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1333| SYNTHESIS AND CHARACTERIZATION OF WO3 AND WS2 NANOSTRUCTURES AND CATALYTIC TEST IN SULFUR REMOTION | |
| RAFAEL HUIRACHE ACUÑA FRANCISCO PARAGUAY DELGADO LORENA ALVAREZ CONTRERAS | |
| Acceso Abierto | |
| Sin Derechos Reservados | |
| Nanostructures WO3 and WS2 | |
| Transition metal dichalcogenides TX2 (T = transition metal of group IVB, VB and VIB, chalcogen, i.e. S, Se and Te) constitute a structurally and chemically well-defined family of compounds [1]. Their uses range from photoactive materials in photoelectrochemical solar cells, to cathodes in solid state lithium batteries, due to their ability to intercalate with lithium ions [1, 2], to lubricants for tribological applications [3], and catalysts [4]. Studies on hydrodesulfurization (HDS) catalysts are nowadays stimulated by the increase in environmental regulations to reduce the amount of sulfur in vehicle transportation fuels [5]. Thus, HDS catalysts are required to be ever more effective. As is well known, a common approach to increase the number of active sites on catalysts is to decrease their particle size to nanostructured materials. For this reason, increasing research has been focused on nanomaterials to be used as HDS catalysts [6]. To date, molybdenum and tungsten sulfides are well known hydrotreating catalysts, used for decades in the treatment of heavy crude oils to eliminate heteroatoms such as sulfur and break-down aromatic molecules [7]. Various strategies have been used for the synthesis of WS2 nanostructures. For example, WS2 tubes have been synthesized from W18O49 rods produced by heating tungsten foil at high voltages under argon flow in the presence of SiO2 [8], by the reaction of hexacarbonyl W(CO)6 as precursor with H2S in argon in a microwave plasma [9], by burning tungsten wire in low-oxygen-partial pressure atmosphere in argon gas [10], and by template self-assembly of anionic tungstates (WS4 -2) and cationic surfactant molecules such as cetyl trimetyl ammonium (CTA+) in solution under appropriate conditions [11]. Recently, WO3 was found to be a versatile precursor in the synthesis of nanostructured WS2 [12, 13]. In this paper we describe the synthesis and characterization of WS2 nanostructures by using WO3 in nanostructured form as precursor and a two-step hydrothermal/gas phase reaction method. Additionally, the catalytic properties of this sulfide nanostructure are discussed. | |
| 2010 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión revisada | |
| submittedVersion - Versión revisada | |
| Aparece en las colecciones: | Artículos de Congresos |
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| Fichero | Tamaño | Formato | |
|---|---|---|---|
| WO3 and WS2 (1).pdf | 958.09 kB | Adobe PDF | Visualizar/Abrir |