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15 results on '"Vitiello, Rosa"'

8. Chromatographic reactor modelling

Author

Russo, Vincenzo, primary, Tesser, Riccardo, additional, Rossano, Carmelina, additional, Vitiello, Rosa, additional, Turco, Rosa, additional, Salmi, Tapio, additional, and Di Serio, Martino, additional

Published
2019
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9. Branched alkyldimethylamine oxide surfactants: An effective strategy for the design of high concentration/low viscosity surfactant formulations

Author

Fabozzi, Antonio, primary, Russo Krauss, Irene, additional, Vitiello, Rosa, additional, Fornasier, Marco, additional, Sicignano, Luca, additional, King, Stephen, additional, Guido, Stefano, additional, Jones, Christopher, additional, Paduano, Luigi, additional, Murgia, Sergio, additional, and D'Errico, Gerardino, additional

Published
2019
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14. Influence of preparation methods and structure of niobium oxide-based catalysts in the epoxidation reaction

Author

Luciana Minieri, Rosa Vitiello, Martino Di Serio, Riccardo Tesser, Pasquale Pernice, Rosa Turco, Antonio Aronne, Paolo Carniti, Antonella Gervasini, Turco, Rosa, Aronne, Antonio, Paolo, Carniti, Antonella, Gervasini, Minieri, Luciana, Pasquale, Pernice, Tesser, Riccardo, Vitiello, Rosa, and DI SERIO, Martino

Subjects
Materials science, Inorganic chemistry, General Chemistry, Heterogeneous catalysis, Catalysis, chemistry.chemical_compound, chemistry, Niobium oxide, Hydrogen peroxide, Selectivity, Dispersion (chemistry), Natural bond orbital, Sol-gel
Abstract

The catalytic activity of niobium oxide-based materials, containing the same amount of Nb 2 O 5 (∼15 wt%) and prepared by different methods, with that of pure Nb 2 O 5 in the epoxidation of methyl oleate with hydrogen peroxide was compared. The catalytic performances of the catalyst prepared by impregnation do not differ substantially from the ones of Nb 2 O 5 . The performances of Nb-supported catalysts prepared by sol–gel can be modulated by controlling the process parameters. The high dispersion of the active NbO x species obtained by this preparation method gives very higher selectivity than in the case of pure Nb 2 O 5 . Morphologic and structural characterization of the catalysts helped justifying the obtained catalytic results in terms of activity and selectivity.

Published
2015
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15. Chromatographic reactor modelling

Author

Carmelina Rossano, Tapio Salmi, Riccardo Tesser, Vincenzo Russo, Martino Di Serio, Rosa Turco, Rosa Vitiello, Russo, Vincenzo, Tesser, Riccardo, Rossano, Carmelina, Vitiello, Rosa, Turco, Rosa, Salmi, Tapio, and Di Serio, Martino

Subjects
Chemical substance, Materials science, Intraparticle diffusion, General Chemical Engineering, Methyl acetate, Mass-transfer, 02 engineering and technology, 010402 general chemistry, Thermal diffusivity, 01 natural sciences, Chemical reaction, Modelling, Industrial and Manufacturing Engineering, chemistry.chemical_compound, Mass transfer, Environmental Chemistry, Chemical Engineering (all), Chemical reaction engineering, Chromatography, Chemistry (all), General Chemistry, Chromatographic reactor, 021001 nanoscience & nanotechnology, Ester hydrolysi, 0104 chemical sciences, chemistry, Chemical equilibrium, 0210 nano-technology, Dispersion (chemistry)
Abstract

Reactive chromatography is a special topic in chemical reaction engineering, consisting of the combination of chemical reaction and chromatographic separation. The main idea is to avoid a further separation unit, by performing reaction and separation in one unique equipment, allowing process intensification. This technology is usually applied in hydrolysis (or esterification) reactions, that undergoes through the reaching of chemical equilibrium. The chromatographic reactor application would lead to complete conversion, by separating reactants and products as the reaction proceeds. Modelling is certainly a delicate issue for chromatographic reactor to optimize the operation conditions, thus different approaches were published. The aim of the present work is to show a novel chromatographic reactor model, were all the physical and chemical phenomena involved and described by a rigorous approach. The fluid-dynamics was treated by axial dispersion approach, and the Peclet number values were obtained from dedicated experiments. The external fluid-solid mass transfer was calculated from existing correlations, demonstrating to be negligible for the modelled chromatographic reactor. The intraparticle mass diffusion was assumed to be the sum of two parallel contributions, i.e. porous and surface diffusivity. The model was tested on literature data for methyl acetate hydrolysis experiments with satisfactory results, obtaining reliable values of the surface diffusivity. A sensitivity analysis was conducted highlighting that the model can predict complete ester conversion and product separation.

Published
2019
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