Structure and catalytic properties of nanostructured molybdenum sulfides

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• 作者：G.A. Camacho-Bragado ; J.L. Elechiguerra ; A. Olivas ; S. Fuentes ; D. Galvan and M. Jose Yacaman
• 关键词：HREM ; Molybdenum sulfide nanowires ; Hydrotreating catalyst
• 刊名：Journal of Catalysis
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：234
• 期：1
• 页码：182-190
• 全文大小：4128 K

文摘

A nanostructured form of molybdenum disulfide/dioxide was prepared by a two-step hydrothermal/gas phase reaction. The material was composed of a solid MoO₂ core with MoS_2+x crystallites nucleating on its surface. Most of the MoS_2+x consisted of nanowires, which are 14 to 30 nm long and are about one MoS₂ unit cell wide. High-resolution electron microscopy (HREM), electron diffraction, energy-dispersive X-ray spectroscopy (EDS), high-angle annular dark-field (HAADF) and X-ray diffraction were used to characterize the structure of the catalysts. The morphology does not depend strongly on the parent oxide, since both samples presented the oxide and sulfide phases; however, the abundance of nanowires depends on the thickness of the original oxide crystal. The catalytic activity and selectivity measurements of the resulting unsupported catalysts are also presented. In both samples, a higher selectivity for hydrogenation over sulfur removal was found.