TY - JOUR
T1 - Structure and catalytic properties of nanostructured molybdenum sulfides
AU - Camacho-Bragado, G. A.
AU - Elechiguerra, J. L.
AU - Olivas, A.
AU - Fuentes, S.
AU - Galvan, D.
AU - Yacaman, M. Jose
N1 - Funding Information:
The authors thank Dr. Jose Reyes for fruitful discussions. We also appreciate the technical assistance of Carlos Ornelas from CIMAV and G. Alonso. JEOL, Ltd. is acknowledged for providing access to the high-resolution SEM. HREM images were simulated with the SimulaTEM program. Financial support was provided by the AMRC SEMATECH fund, DGAPA, through grant IN119602-3 and project PAPIIT IN119602-3. G.A.C.B. is grateful for the fellowship granted by CONACyT.
PY - 2005/8/15
Y1 - 2005/8/15
N2 - 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 MoS2+x crystallites nucleating on its surface. Most of the MoS2+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.
AB - 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 MoS2+x crystallites nucleating on its surface. Most of the MoS2+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.
KW - HREM
KW - Hydrotreating catalyst
KW - Molybdenum sulfide nanowires
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U2 - 10.1016/j.jcat.2005.06.009
DO - 10.1016/j.jcat.2005.06.009
M3 - Article
AN - SCOPUS:23144457206
SN - 0021-9517
VL - 234
SP - 182
EP - 190
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 1
ER -