Molybdenum sulfides

The goal of lubrication is elimination of this wear and minimizing friction otherwise encountered in dry sliding. This is accompHshed ideally with complete separation of the mbbing surfaces with a full film of lubricant. When complete hill-film separation is impossible, surface chemical effects of a lubricating oil and its additives, or solid-film lubricants such as graphite and molybdenum sulfide, can assist. [Pg.234]

Titanium disulfide has been proposed as a soHd lubricant. The coefficient of friction between steel surfaces is 0.3, compared to only 0.2 for molybdenum disulfide. However, because it does not adhere strongly to metal surfaces, TiS2 is generally less effective than molybdenum sulfide. [Pg.133]

Although supported Pd catalysts have been the most extensively studied for butadiene hydrogenation, a number of other catalysts have also been the object of research studies. Some examples are Pd film catalysts, molybdenum sulfide, metal catalysts containing Fe, Co, Ni, Ru, Rh, Os, Ir, Pt, Cu, MgO, HCo(CN) on supports, and LaCoC Perovskite. There are many others (79—85). Studies on the weU-characteri2ed Mo(II) monomer and Mo(II) dimer on siUca carrier catalysts have shown wide variations not only in catalyst performance, but also of activation energies (86). [Pg.342]

Of the many molybdenum sulfides which have been reported, only MoS, M0S2 and M02S3 are well established. A hydrated form of the trisulfide of somewhat variable composition is precipitated from aqueous molybdate solutions by H2S in classical analytical separations of molybdenum, but it is best prepared by thermal decomposition of the thiomolybdate, (NH4)2MoS4. MoS is formed by heating the calculated amounts of Mo and S in an evacuated tube. The black M0S2, however, is the most stable sulfide and, besides being the principal ore of Mo,... [Pg.1017]

The drop in intensity can best be explained by assuming that the molybdenum sulfide form is sintering into large clusters. The model of Kerkhof and Moulijn (20) was used to interpret this data. [Pg.9]

Hydrodesulfurization of Benzothiophene Catalyzed by Molybdenum Sulfide Cluster Encapsulated into Zeolites... [Pg.107]

A cationic molybdenum sulfide cluster [Mo3S4(H20)9] " with incomplete cubane-type structure and a cationic nickel-molybdenum mixed sulfide cluster [Mo3NiS4Cl(H20)9p " with complete cubane-type structure were introduced into zeolites NaY, HUSY and KL by ion exchange. Stoichiometry of the ion exchange was well established by elemental analyses. The UV-visible spectra and EXAFS analysis data exhibited that the structure of the molybdenum cluster remained virtually intact after ion exchange. MoNi/NaY catalyst prepared using the molybdenum-nickel sulfide cluster was found to be active and selective for benzothiophene hydrodesulfurization. [Pg.107]

Role of adsorbed hydrogen species on ruthenium and molybdenum sulfides. Characterization by inelastic neutron scattering, thermoanalysis methods and model reactions. [Pg.117]

Molybdenum Sulfide Nanoclusters and Catalytic Hydrodesulfurisation Reaction Pathways... [Pg.169]

Mastai Y, Homyonfer M, Gedanken A et al (1999) Room temperature sonoelectrochemical synthesis of molybdenum sulfide fullurene-like nanoparticles. Adv Mat 11 1010-1013... [Pg.129]

Mdleleni et al. [67] have reported a simple sonochemical route to generate nanos-tructured molybdenum sulfide (M0S2) using molybdenum hexacarbonyl and sulfur. [Pg.206]

Mdleleni MM, Hyeon T, Suslick KS (1998) Sonochemical synthesis of nanostructured molybdenum sulfide. J Am Chem Soc 120 6189-6190... [Pg.211]

Daage, M., and Chianelli, R. R., Structure-Function Relations in Molybdenum Sulfide Catalysts The Rim-Edge Model. J. Catal., 1994. 149 pp. 414-427. [Pg.58]

Moreau, C. Bekakra, L. Olive, J. L., and Geneste, P., Hydrodenitrogenation of Quinoline and Phenanthridine in the Presence of 2, 6-Diethylaniline and Hydrogen-Sulfide Over Molybdenum and Nickel-Molybdenum Sulfides Supported on Zirconia, Titania, Nickel-Aluminates and Magnesium-Aluminates. Bulletin Des Societes Chimiques Beiges, 1991. 100(11-12) pp. 841-847. [Pg.59]

Figure 2. These high-resolution micrographs show how a so-called x-ray amorphous, nonstoichiometric molybdenum sulfide catalyst exhibits structural (as well as compositional) heterogeneity. Amorphous, quasi-crystalline, and crystalline regions coexist at the ultramicro level (18,).

Schwarz, D. E. Rauchfuss, T. B. Wilson, S. R. 2003. Aggregation of PMe3-stabilized molybdenum sulfides and the catalytic dehydrogenation of H2S. Inorg. Chem. 42 2410-2417. [Pg.108]

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