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In this paper the catalytic activity of the Ru-doped polymer-based catalysts synthesized by the hydrothermal deposition is described. The catalytic properties of the synthesized systems were studied in the liquid-phase Fischer–Tropsch synthesis for the production of liquid gasoline and diesel-range hydrocarbons. The catalysts showed high CO hydrogenating activity allowing more than 20% of CO conversion to be obtained for one cycle. The yield of liquid hydrocarbons (mainly linear C5-C13) was found to be more than 80%. The addition of the ruthenium to the commonly used Co, Ni, and Fe enhances both the catalytic activity and the yield of the liquid hydrocarbons. The catalysts seem to be stable for minimum 80 h on stream. [ABSTRACT FROM AUTHOR]

This work is devoted to kinetic modelling of levulinic acid (LA) hydrogenation to gamma-valerolactone (GVL) in aqueous medium in a batch mode using 5%-Ru/MN100 catalyst, which comprises Ru dioxide nanoparticles confined in polymeric network of hyper-crosslinked polystyrene of MN100 type. Kinetic models of liquid-phase hydrogenation of LA to GVL were proposed based on Langmuir–Hinshelwood and Eley–Rideal mechanisms. Calculations based on experimental data obtained during the study allowed determining the main kinetic parameters of LA hydrogenation reaction and to propose the rate expression adequately describing the catalytic process. Moreover, hypothesis on the reaction mechanism was proposed considering RuO2 as catalytically active phase and 4-hydroxypentanoic acid as main intermediate compound. [ABSTRACT FROM AUTHOR]

In the current work, the use of Ni-containing catalyst on the base of hypercrosslinked polystyrene in the stearic acid (SA) hydrodeoxygenation (HDO) in the medium of supercritical n-hexane is presented. The catalyst was synthesized by the hydrothermal deposition of Ni-containing particles into the pores of the polymeric matrix in the medium of superheated water. It was found that the catalyst is characterized by the high surface area and the uniform deposition of the active phase on the catalyst surface. Ni in the catalyst is represented by NiOOH. The mean particle diameter of the active phase was found to be 5.5 nm. The catalyst showed high efficiency in the SA HDO in the medium of supercritical n-hexane reaching the C16-C17 yield up to 90 at 100% substrate conversion. It was shown that the catalyst maintained its activity in minimum five consecutive runs without sufficient loose selectivity. [ABSTRACT FROM AUTHOR]

In the current work, we present the study of the catalytic performance and characterization of the modified H-ZSM-5 zeolite for methanol to hydrocarbons process. The modification of zeolite was performed by both alkali and acid treatment. The changes in the zeolite structure were studied using low-temperature nitrogen physisorption, NH3 chemisorption, and X-Ray photoelectron spectroscopy. It was found that the zeolite modification with oxalic acid (0.01 M) resulted in the lower catalytic activity loss (48%) after 120 h on stream as compared to both initial and alkali treated H-ZSM-5. Further, the chosen zeolite sample was modified with Co, Fe, and Ni by wet impregnation with the corresponding metal nitrates. The Ni-containing catalyst showed the highest catalytic performance in time on stream. The decrease in the methanol transformation rate for the Ni-containing zeolite was found to be only 27%. The metal-containing catalysts showed the minimal coke formation as well as the minimal decrease in acidity and surface area as compared to the initial zeolite and the samples treated with both alkali and oxalic acid. [ABSTRACT FROM AUTHOR]

The article was published without grant no in the acknowledgement. The complete acknowledgement is given in this correction. [ABSTRACT FROM AUTHOR]