Federica Menegazzo
Ca' Foscari University of Venice
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Featured researches published by Federica Menegazzo.
Applied Catalysis A-general | 2001
Francesco Pinna; Federica Menegazzo; Michela Signoretto; Patrizia Canton; Giuliano Fagherazzi; N. Pernicone
Abstract Pd catalysts on different supports (active carbon, silica, alumina) were studied for the selective hydrogenation of benzaldehyde to benzyl alcohol. They were characterized by TPR, CO chemisorption and XRD. Batch hydrogenation tests were performed before and after sulfur poisoning. Strong metal–support interaction was found for Pd/alumina, giving high Pd dispersion. Chemisorption stoichiometry Pd/CO=2 was confirmed again. While Pd/C has the highest activity for benzaldehyde hydrogenation, a satisfactory selectivity to benzyl alcohol requires an oxidic carrier or proper sulfur poisoning of Pd/C.
Chemsuschem | 2008
Federica Menegazzo; Francesco Pinna; Michela Signoretto; Valentina Trevisan; F. Boccuzzi; Anna Chiorino; Maela Manzoli
Gold-loaded zirconia and sulfated zirconia catalysts were tested in the low-temperature water gas shift reaction. The samples were characterized by N2 adsorption analysis, temperature-programmed reduction, X-ray diffraction, pulse-flow CO chemisorption, FTIR spectroscopy, and high-resolution transmission electron microscopy. A reference catalyst, Au/TiO2, provided by the World Gold Council was investigated for comparison. CO chemisorption and FTIR data indicate the presence of only highly dispersed gold clusters on the sulfated sample and both small clusters and small particles on the non-sulfated sample. Both gold-zirconia catalysts are much more active than the Au/TiO2 reference sample over all the temperature range investigated. The sample prepared on sulfated zirconia exhibits higher stability than the catalyst on unmodified zirconia. The prominent role in the water gas shift reaction of gold clusters in close contact with the support was deduced.
Catalysis Letters | 2003
Patrizia Canton; Federica Menegazzo; Stefano Polizzi; Francesco Pinna; N. Pernicone; Pietro Riello; Giuliano Fagherazzi
A polydomain internal structure was evidenced by means of High Resolution Transmission Electron Microscopy (HRTEM) in palladium nanoparticles of two 5% Pd/SiO2 catalysts prepared by impregnation technique. Such poly-domain structure biased the line broadening analysis of the XRPD patterns, from which highly underestimated average diameters were obtained in comparison to those measured by means of Transmission Electron Microscopy (TEM).In both the investigated catalysts, a Pd/CO average chemisorption stoichiometry close to 2 was found, in good agreement with previous results obtained for Pd/C and Pd/γ-Al2O3 catalysts. The consistency of this result, in cases with different particle sizes and different support materials, suggests that such average stoichiometry is of general validity for palladium, when chemisorption measurements of CO are made using pulse flow technique.
Studies in Surface Science and Catalysis | 2002
Patrizia Canton; Federica Menegazzo; Michela Signoretto; Francesco Pinna; Pietro Riello; Alvise Benedetti; N. Pernicone
catalytic properties of zirconia supported Pd-Au samples Elena Ghedini, Michela Signoretto, Federica Menegazzo, Francesco Pinna, Giorgio Strukul, Maela Manzoli, b Flora Boccuzzi b a Dipartimento di Chimica, Università Cà Foscari Venez ia, and Consorzio INSTM, Dorsoduro 2137, 30123 Venezia, I taly. [email protected] ; b Dipartimento di Chimica IFM and NIS Centro di Eccellenza, Università di Torino, Italy
RSC Advances | 2016
Nicola Gemo; Federica Menegazzo; Pierdomenico Biasi; Anjana Sarkar; Ajaikumar Samikannu; Dilip G. Raut; Krisztian Kordas; Anne Riikka Rautio; Melinda Mohl; Dan Boström; Andrey Shchukarev; Jyri-Pekka Mikkola
The performance of Pd on titania support were evaluated in the direct synthesis of hydrogen peroxide. The equipment used was a high pressure, semi-batch apparatus equipped with a special injection ...
Topics in Catalysis | 2018
Federica Menegazzo; Maela Manzoli; Alessandro Di Michele; Elena Ghedini; Michela Signoretto
Gold nanoparticles prepared by sol immobilization using PVA as protecting agent were supported over different oxides (CeO2, ZrO2 and TiO2). The activity of the gold catalysts was tested in the oxidative esterification of furfural by an efficient and sustainable process. The samples supported on ceria and zirconia (AuCe and AuZr) have shown complete conversion and selectivity under mild reaction conditions. The catalytic performances are better than those obtained with the reference commercial AuTiWGC. The DR UV–Vis spectroscopic results indicate that gold nanoparticles that give rise to similar plasmonic band, as in the case of AuCe and AuZr, are very active and highly selective. The extent of crystallinity of the gold particles seems to have no influence on the activity of the sol immobilized catalysts. The null selectivity of the catalyst supported on titania is probably due to the presence of residual sulphate groups. The effect of the oxygen pressure on the furfural conversion is almost negligible for all the samples and, despite of the oxygen pressure lowering, it is possible to obtain always high conversion and selectivity. The selectivity of the process is unaffected by using air instead of oxygen, even at very low pressures. On the contrary, the presence of PVA seems to influence the conversion when working in air at low pressures, due to a dilution effect of the oxidant atmosphere. This is confirmed by the results obtained for a sample synthesized by deposition precipitation of gold on zirconia, where the high metal dispersion and the absence of the protecting agent allowed to reach high conversion even in low air pressure.
Molecules | 2018
Federica Menegazzo; Elena Ghedini; Michela Signoretto
The present paper reviews recent advances on the direct synthesis of 5-hydroxymethylfurfural (HMF) from different kinds of raw biomasses. In particular, in the paper HMF production from: (i) edible biomasses; (ii) non-edible lignocellulosic biomasses; (iii) food wastes (FW) have been reviewed. The different processes and catalytic systems have been reviewed and their merits, demerits and requirements for commercialisation outlined.
Cardiovascular Pathology | 2014
Elena Ghedini; Cristina Pizzolitto; G. Albore; Federica Menegazzo; Michela Signoretto; L. Operti; G. Cerrato
In the present contribution a versatile and sustainable strategy for the formulation of a drug delivery system for the controlled release of antibiotics for topical administration was developed. Silver sulfadiazine (AgSD), an antimicrobial agent for preventing infections on burn wounds, was selected as model drug. The drug delivery system was formulated by an effective one-pot sol–gel approach by using chitosan and silica alkoxides as organic and inorganic precursor, respectively, in order to obtain a hybrid material. Different silica alkoxides, characterized by different functionalities of the organic chain, and a series of synthetic parameters (water/precursor ratio, excipients, and drug amount) were evaluated. The composition of the hybrid gel was selected to achieve the optimal synergy between the physico-chemical features and the gel texture taking into great account the final application, i.e., a topical administration. Drug delivery tests were performed in vitro with a Franz vertical diffusion cell. The new drug delivery system reaches the therapeutic concentration in the same time of a commercial sample and allows the complete release of even 2.5 wt% AgSD. The drug delivery is totally controlled and gradual over 48 h and the formulated is stable in time. Such innovative organic–inorganic hybrid material is therefore an efficient drug delivery system for acute skin infections treatment by controlled delivery.Graphical Abstract
Applied Catalysis B-environmental | 2012
Valentina Nichele; Michela Signoretto; Federica Menegazzo; Alessandro Gallo; Vladimiro Dal Santo; Giuseppe Cruciani; G. Cerrato
Journal of Catalysis | 2006
S. Melada; Riccardo Rioda; Federica Menegazzo; Francesco Pinna; Giorgio Strukul