Consorzio Interuniversitario Of Reattivita Chimica talisi Circc

Sammichele di Bari, Italy

Consorzio Interuniversitario Of Reattivita Chimica talisi Circc

Sammichele di Bari, Italy
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Turco R.,University of Naples Federico II | Turco R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Vitiello R.,University of Naples Federico II | Vitiello R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | And 6 more authors.
Topics in Catalysis | Year: 2017

In this paper, nine different catalysts have been used for the epoxidation of methyl oleate with hydrogen peroxide as oxidant. The prepared catalysts were mostly based on supported systems niobia–alumina and niobia–silica. Experimental runs were carried out in a lab-scale reactor, keeping constant operating parameters such as reaction temperature (80 °C) and time (5 h), and molar ratio between oxidant and methyl oleate (equal to 4). Runs aimed at the quantitative evaluation of system conversion, yield and selectivity. Nb2O5/SiO2 were found to be active in epoxidation reaction, in particular the catalyst with intermediate niobia loading (6% w/w) showed very high conversion (77%) even if with a very low selectivity to epoxides (30%). Instead, regarding the system based on Nb2O5/Al2O3, both better activity and selectivity were reached. In particular, the material containing 12% of Niobia yielded the highest values for conversion (83%) and selectivity (89%). The results have been critically discussed through the outcomes of a deep characterization of the catalytic materials, carried out through porosimetric, X-ray diffraction, ultra violet and visible diffuse reflection, and Raman microscopy analyses. The discussion highlighted the more relevant parameters able to influence the activity of niobia-based catalysts in the methylesters epoxidation. © 2017 Springer Science+Business Media New York


Vitiello R.,University of Naples Federico II | Vitiello R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Tesser R.,University of Naples Federico II | Tesser R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | And 7 more authors.
Chemical Engineering Journal | Year: 2017

In this work biolubricant synthesis, obtained by esterification reaction between fatty acids and several polyols using H2WO4/SiO2 as acid catalysts has been reported. Biolubricants in the last few years have generated a great interest in the scientific community and represent an alternative to the petrochemical lubricants. Their properties are similar to those of petrochemical lubricants but at the same time they are more degradable, less toxic and so less polluting with respect to mineral lubricants. The purpose of this work is to verify the catalytic activity and the catalyst stability in the esterification reaction by performing experiments in both batch and loop packed bed reactors. The results obtained for the synthesis of lubricants are very encouraging: high yields and a good stability of the catalyst. The collected data have been interpreted with a lumped kinetic model, obtaining satisfactory results for both the investigated systems. © 2017.


Esposito R.,University of Naples Federico II | Esposito R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Calvanese L.,CIRPe | Cucciolito M.E.,University of Naples Federico II | And 12 more authors.
Organometallics | Year: 2017

Platinum(II) olefin compounds [PtMe(N,N′-imino, amide)(η2-olefin)] have been found to dimerize spontaneously in solution, yielding dinuclear complexes through an oxidative coupling. The extended conjugation within the molecules produces an intense blue color, and the properties of the compounds have been investigated through NMR spectroscopy, optical measurements, and theoretical calculations. The solid-state structure of a representative compound has been solved. © 2017 American Chemical Society.


Ruffo F.,University of Naples Federico II | Ruffo F.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Bismuto A.,University of Naples Federico II | Carpentieri A.,University of Naples Federico II | And 5 more authors.
Inorganica Chimica Acta | Year: 2013

It is described the simple design of a series of N,N′,O,O′- chiral ligands (elpaN-salen-H2), which represent a subset of the elpaN-type library of ligands based on β-1,2-D-glucodiamine. The corresponding Mn(III) complexes were examined in the asymmetric epoxidation of styrenes with satisfactory results, e.g. cis-β-methylstyrene was functionalised in ees up to 88%. © 2013 Elsevier B.V. All rights reserved.


Benessere V.,University of Naples Federico II | Benessere V.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Cucciolito M.E.,University of Naples Federico II | Cucciolito M.E.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | And 9 more authors.
JAOCS, Journal of the American Oil Chemists' Society | Year: 2015

This work describes two sustainable methods for production and purification of azelaic acid (AA) to replace the current process of ozonolysis of oleic acid (OA). The first proceeds in two steps, coupling smooth oxidation of OA to 9,10-dihydroxystearic acid (DSA) with subsequent oxidative cleavage by sodium hypochlorite. An alternative methodology is also proposed, using a chemocatalytic system consisting of H2O2/H2WO4 for direct oxidative cleavage of the double bond of OA at 373 K. A convenient technique for separation and purification of azelaic acid is also proposed. © 2015 AOCS.


Vitiello R.,University of Naples Federico II | Vitiello R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Tesser R.,University of Naples Federico II | Tesser R.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | And 3 more authors.
Industrial and Engineering Chemistry Research | Year: 2016

A new class of catalysts promoting the hydrochlorination of glycerol to obtain selectively 1,3-dichlorohydrin has recently been discovered. These catalysts are acyl chlorides and prove to be much more active and sometimes more selective than the corresponding carboxylic acids, usually employed to promote this reaction. Many different kinetic runs have been performed to compare the performances of acetyl chloride and acetic acid, propanoyl chloride and propionic acid, adipoyl dichloride and adipic acid, succinyl dichloride and succinic acid, and malonyl dichloride and malonic acid, respectively. In all cases, the activity of the acyl chloride proved to be much higher. This behavior has been discussed and explained on the basis of a possible reaction mechanism. The reaction occurs rapidly even if glycerol is contaminated with NaCl. By adding a stoichiometric amount of an acyl chloride to glycerol, the hydrochlorination occurs in a short time, with a high selectivity, without any external supply of HCl, because acyl chlorides react promptly and quantitatively with glycerol forming HCl in situ. To avoid an excessive increase of the HCl pressure, acyl chlorides must be fed into a reactor containing glycerol with an opportune flow rate. The flow rate employed affects both the activity and the selectivity as has been demonstrated in two kinetic runs performed at two different flow rate levels of acetyl chloride. © 2016 American Chemical Society.


Benessere V.,University of Naples Federico II | Cucciolito M.E.,University of Naples Federico II | Cucciolito M.E.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Poggetto G.D.,University of Naples Federico II | And 10 more authors.
Catalysis Communications | Year: 2014

This work describes two strategies for immobilizing Zn(II) catalysts: anchorage of a [ZnCl2(N,N)] type complex on silica and decoration of PAMAM-G0-3 dendrimers with analogous metal pendants. Both types of catalysts were able to catalyze the trans-esterification of neutral and acid soybean oil, and could be easily recycled through filtration techniques. © 2014 Elsevier B.V.


Cucciolito M.E.,University of Naples Federico II | Cucciolito M.E.,Consorzio Interuniversitario Of Reattivita Chimica talisi Circc | Lega M.,Fater SPA | Papa V.,University of Naples Federico II | And 3 more authors.
Catalysis Letters | Year: 2016

Abstract: This study aimed to optimize the zinc-catalyzed trans-esterification, and pointed to assess the effect of the solvent, the catalyst, its loading and the nature of the substrate. The screening disclosed the remarkable ability of zinc(II) acetate to promote the reaction in refluxing toluene at low catalyst loading. A significant improvement ensued with respect to recently results on the same reactions, in terms of less restrictive conditions and more convenient catalyst precursors. Graphical Abstract: [Figure not available: see fulltext.] © 2016 Springer Science+Business Media New York

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