TY - JOUR
T1 - Structure and catalytic properties of molybdenum sulfide nanoplatelets
AU - Elizondo-Villarreal, Nora
AU - Velázquez-Castillo, Rodrigo
AU - Galván, Donald H.
AU - Camacho, A.
AU - José Yacamán, Miguel
N1 - Funding Information:
The authors thank the technical assistance of Carlos Ornelas, Lorena Alvarez, Jose Lumbreras from CIMAV, Chiuahua, México and financial support through ICNAM-UT, Austin, USA is acknowledged. We are indebted to the Welch foundation and to DARPA for financial support. We are also grateful to FEI company for let us use the Titan microscope.
PY - 2007/8/31
Y1 - 2007/8/31
N2 - A nanostructured form of molybdenum disulfide/dioxide was prepared by a two-step hydrothermal/gas phase reaction carried at high-temperature sulfidation of molybdenum in H2S/H2 for 2 h. The material was composed of a solid MoO2 core with MoS2+x crystallites nucleating on its surface. Most of the MoS2+x have the shape of a single stacked platelet, which are 12-30 nm long and are about one MoS2 unit cell wide. High-resolution electron microscopy (HREM), energy-dispersive X-ray spectroscopy (EDS), scanning transmission electron microscopy (STEM), in high-angle annular dark-field (HAADF). Electron diffraction (EDX) in the transmission electron microscope and X-ray diffraction were used to characterize the structure of the catalysts. It is found that the sample consists of MoS2+x nanoplatelets with unit cell thickness which are exfoliated and are free to rotate along the basal plane. In addition, the edges of the platelets become very rough increasing the number of adsorption sites. The structure-catalytic properties of MoS2+x for hydrogenation over sulfur removal were observed in the hydrodesulphurization (HDS) reaction of dibenzothiophene (DBT). It was found that nanoplatelets have a very high catalytic activity for HDS. The number of adsorption sites is incremented by the presence of steps and kinks at the edges of the nanoplatelets.
AB - A nanostructured form of molybdenum disulfide/dioxide was prepared by a two-step hydrothermal/gas phase reaction carried at high-temperature sulfidation of molybdenum in H2S/H2 for 2 h. The material was composed of a solid MoO2 core with MoS2+x crystallites nucleating on its surface. Most of the MoS2+x have the shape of a single stacked platelet, which are 12-30 nm long and are about one MoS2 unit cell wide. High-resolution electron microscopy (HREM), energy-dispersive X-ray spectroscopy (EDS), scanning transmission electron microscopy (STEM), in high-angle annular dark-field (HAADF). Electron diffraction (EDX) in the transmission electron microscope and X-ray diffraction were used to characterize the structure of the catalysts. It is found that the sample consists of MoS2+x nanoplatelets with unit cell thickness which are exfoliated and are free to rotate along the basal plane. In addition, the edges of the platelets become very rough increasing the number of adsorption sites. The structure-catalytic properties of MoS2+x for hydrogenation over sulfur removal were observed in the hydrodesulphurization (HDS) reaction of dibenzothiophene (DBT). It was found that nanoplatelets have a very high catalytic activity for HDS. The number of adsorption sites is incremented by the presence of steps and kinks at the edges of the nanoplatelets.
KW - Electron microscopy
KW - Hydrodesulphurization
KW - Molybdenum sulfide nanoplatelets
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U2 - 10.1016/j.apcata.2007.05.031
DO - 10.1016/j.apcata.2007.05.031
M3 - Article
AN - SCOPUS:34447307963
SN - 0926-860X
VL - 328
SP - 88
EP - 97
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1
ER -