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Pt/Sup catalysts with SiO2, MCM-48, and Al2O3 supports (Sup) were prepared. The catalysts were studied by methods of low-temperature nitrogen adsorption, temperature-programmed reduction, and high-resolution transmission electron microscopy. The kinetic characteristics of hydrogenation of biphenyl and diphenylmethane taken separately and of their eutectic mixture were studied on a flow-through catalytic installation at temperatures of 150–170°С, pressure of 4 MPa, liquid hourly space velocity (LHSV) of 5–15 h–1, and hydrogen/feed ratio of 500 m3n.c./m3. A biphenyl–diphenylmethane eutectic mixture (weight ratio 35 : 65) was used as a model mixture. According to the data obtained, the catalyst activity decreases in the order Pt/MCM-48 > Pt/Al2O3 > Pt/SiO2. The use of mesostructured silicate MCM-48 as a support allows the dispersity of the active phase to be increased compared to the traditional SiO2 and Al2O3, which enhances the catalyst activity in hydrogenation of biphenyl and diphenylmethane. [ABSTRACT FROM AUTHOR]

Supported CoMoS and NiWS catalysts were synthesized on the basis of an Al2O3—SAPO-11 composite support. The acid and texture characteristics of the thus synthesized materials were examined. The morphologies of the active sulfide phase of the catalysts were compared. The kinetic properties of the supported sulfide catalysts in the reaction of hydroisomerization of n-hexadecane and in the hydroprocessing of the diesel fraction were examined. It was shown that it is possible to obtain hydrogenates with improved low-temperature properties in the presence of supported sulfide catalysts containing no noble metals. [ABSTRACT FROM AUTHOR]

MoS2/Al2O3 and NiMoS2/Al2O3 catalysts were prepared by incipient wetness impregnation of alumina using aqueous solutions of 12-molybdophosphoric heteropolyacid and nickel citrate. Unsupported catalysts were prepared by etching a support made from MoS2/Al2O3 using hydrofluoric acid (Et-MoS2) and thermal decomposition of aluminum tetrathiomolybdate (Ref-MoS2). The activity of the catalysts in hydrodeoxygenation decreases in the series NiMoS2/Al2O3 = Et-MoS2 > MoS2/Al2O3 > Ref-NiS2. On the other hand, the selectivity relative hydrogenation of oleic acid has a different order: Et-MoS2 > MoS2/Al2O3 > Ref-MoS2 > NiMoS2/Al2O3. The unsupported Et-MoS2 catalyst has similar activity to NiMoS2/Al2O3 in hydrodeoxygenation and the highest selectivity, which indicates virtually completion of the hydrodeoxygenation reaction through a hydrogenation pathway without the formation of CO or CO2. These gases display strong inhibiting properties and have a detrimental eject on the environment. [ABSTRACT FROM AUTHOR]