Application of Extended Irreversible Thermodynamics to Nanosized Systems: Effect of Diffusion and Chemical Reactions on the Properties of Ni–W Sulfide Catalysts
| Autor: | I. A. Sizova, M. I. Kniazeva, S. I. Serdyukov, Anton L. Maximov |
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| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Tungsten hexacarbonyl Materials science Sulfide 010405 organic chemistry General Chemical Engineering Diffusion Energy Engineering and Power Technology chemistry.chemical_element General Chemistry 010402 general chemistry 01 natural sciences Chemical reaction 0104 chemical sciences Catalysis Nickel chemistry.chemical_compound Fuel Technology Hydrocarbon chemistry Chemical engineering Geochemistry and Petrology Ionic liquid |
| Zdroj: | Petroleum Chemistry. 59:518-528 |
| ISSN: | 1555-6239 0965-5441 |
| DOI: | 10.1134/s0965544119050098 |
| Popis: | The effect of precursor on the properties of nanosized sulfide catalysts prepared by the in situ decomposition of nickel–tungsten compounds is studied. Precursors are nickel-thiotungsten complexes [(Ph)3S]2Ni(WS4)2 in the hydrocarbon feedstock, [BMPip]2Ni(WS4)2 in the hydrocarbon feedstock and ionic liquid, and tungsten hexacarbonyl in the hydrocarbon feedstock; oil-soluble salt nickel(II) 2-ethyl hexanoate is used as a source of nickel. The synthesized catalysts are investigated by electron microscopy methods, X-ray powder diffraction, and X-ray photoelectron spectroscopy. Diffusion and chemical reactions in nanosystems are described by the methods of extended irreversible thermodynamics based on a postulate according to which additional variables are time derivatives of usual thermodynamic variables. It is shown that, as the size of nanoparticles decreases, the velocities of diffusion and oxidation chemical reaction in catalyst domains decline; as a result, the content of oxygen in the sample prepared in the hydrocarbon feedstock is lower than that in the sample prepared in the ionic liquid. |
| Databáze: | OpenAIRE |
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