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Relevant academic research and scientific papers

Synthesis of nickel-tungsten sulfide hydrodearomatization catalysts by the decomposition of oil-soluble precursors

Nickel-tungsten sulfide catalysts for the hydrogenation of aromatic hydrocarbons have been prepared by the in situ decomposition of an oil-soluble tungsten hexacarbonyl precursor in a hydrocarbon feedstock using oil-soluble nickel salt nickel(II) 2-ethylhexanoate as a source of nickel. The in situ synthesized Ni-W-S catalyst has been characterized by X-ray photoelectron spectroscopy. The activity of the resulting catalysts has been studied in the hydrogenation of bicyclic aromatic hydrocarbons and dibenzothiophene conversion in a batch reactor at a temperature of 350°C and a hydrogen pressure of 5.0 MPa. It has been shown that the optimum W: Ni molar ratio is 1: 2. Using the example of the hydrofining of feedstock with high sulfur and aromatics contents, it has been shown that the synthesized catalyst exhibits high activity in the hydrogenation of aromatic hydrocarbons.

Nickel-tungsten sulfide aromatic hydrocarbon hydrogenation catalysts synthesized in situ in a hydrocarbon medium

Nickel-tungsten sulfide nanocatalysts for the hydrogenation of aromatic hydrocarbons (HCs) have been prepared by the in situ decomposition of a nickel thiotungstate precursor in a HC feedstock using 1-butyl-1-methylpiperidinium nickel thiotungstate complex [BMPip]2Ni[WS4]2 as the precursor. The in situ synthesized particles have been characterized by X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy. It has been shown that the resulting Ni-W-S particles are nanoplates associated in multilayer agglomerates; the average length of the Ni-W-S particles is 6 nm; the average number of layers in the multilayer packaging is three. The catalytic activity of the synthesized catalysts has been studied in the hydrogenation of model mixtures of mono- and bicyclic aromatic HCs and in the conversion of dibenzothiophene in a batch reactor at a temperature of 350°C and a hydrogen pressure of 5.0 MPa. It has been shown that the studied catalysts can be used for the hydrofining of light cycle oil.

Characterization of New Methyl-Substituted Tetralins and Indans by 13C NMR Spectroscopy

In order to perform the analysis of the components contained in fossil fuels, carbon assignments of new methylated derivatives of tetralin and indan were obtained.Their chemical shifts were calculated by applying additivity rules. - Keywords: NMR; 13C NMR; tetralins; indans

Pyrolysis of 9-Methylenespironona-5,7-diene: A Route to Benzo-2-hexene-1,6-diyl, a Putative Intermediate in the Retro-Diels-Alder Reaction of Tetralin

A precursor to the 1,6-biradical potentially formed in the retro-Diels-Alder reaction of tetralin, namely, 5-methylenespirohept-2-ene-6,1'-cyclobutan>-7-one (9) has been prepared and found to give tetralin and o-allyltoluene upon pyrolysis in solution below 100 deg C and upon flash vacuum pyrolysis around 250 deg C.The product ratio changes from 1:1 to 6:1 at higher temperatures.Rate-determining loss of CO from 9 to give 9-methylenespironona-5,7-diene, 2, has been demonstrated by trapping the triene with N-methyl- and N-phenyltriazolinedione in a reaction whose rate is independent of trapping agent concentration.The kinetics for loss of ketone, 9, gave log k (s-1) = 14.628 +/- 0.038 - (30.554 +/- 0.064)/2.3RT.Pyrolysis of cis-syn(to methylene)- and trans-1,2-dimethyl-9-methylenespironona-5,7-diene gives the vinylcyclobutane rearrangement product, 2,3-dimethyltetralin, with a 4:1 and 2.7:1, respectively, preference for retention over inversion at the migrating carbon.Hydrogen shift products are also formed and by highly ordered transiton states.One of these hydrogen shifts involves an unprecedented shift from the carbon remote from the vinyl group.