Publications (2)13.37 Total impact
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Article: Kinetics of phenol oxidation over hypercrosslinked polystyrene impregnated with Pt nanoparticles
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ABSTRACT: Liqiud-phase catalytic wet-air oxidation (CWAO) of phenolic compounds is one of the most prospective methods of waste water purification at high concentrations of toxic phenolic compounds. In this work the synthesis and catalytic properties of mixed platinum-containing nanoparticles stabilized in polymeric matrix of hypercrosslinked polystyrene are discussed. The size of platinum nanoparticles was determined by transmission electron microscopy. Proposed catalytic system showed the high activity, selectivity and stability in the phenol CWAO. The optimal conditions of phenol oxidation leading to the selectivity of 98–99% at 99% conversion were determined and the kinetics of the process at various catalyst loadings, substrate concentrations, and temperatures was studied. Mathematical modelling of the process was carried out allowing the calculation of the reaction network model.Chemical Engineering Journal 01/2007; 134(1-3):256-261. · 3.46 Impact Factor -
Article: Platinum-containing hyper-cross-linked polystyrene as a modifier-free selective catalyst for L-sorbose oxidation.
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ABSTRACT: Impregnation of hyper-cross-linked polystyrene (HPS) with tetrahydrofuran (THF) or methanol (ML) solutions containing platinic acid results in the formation of Pt(II) complexes within the nanocavities of HPS. Subsequent reduction of the complexes by H2 yields stable Pt nanoparticles with a mean diameter of 1.3 nm in THF and 1.4 nm in ML. The highest selectivity (98% at 100% conversion) measured during the catalytic oxidation of L-sorbose in water is obtained with the HPS-Pt-THF complex prior to H2 reduction. During an induction period of about 100 min, L-sorbose conversion is negligible while catalytic species develop in situ. The structure of the catalyst isolated after the induction period is analyzed by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Electron micrographs reveal a broad distribution of Pt nanoparticles, 71% of which measure less than or equal to 2.0 nm in diameter. These nanoparticles are most likely responsible for the high catalytic activity and selectivity observed. The formation of nanoparticles measuring up to 5.9 nm in diameter is attributed to the facilitated intercavity transport and aggregation of smaller nanoparticles in swollen HPS. The catalytic properties of these novel Pt nanoparticles are highly robust, remaining stable even after 15 repeated uses.Journal of the American Chemical Society 11/2001; 123(43):10502-10. · 9.91 Impact Factor
