The use of mesoporous molecular sieves containing niobium for the synthesis of vegetable oil-based products

Feliczak, Agnieszka; Walczak, Katarzyna; Wawrzyńczak, Agata; Nowak, Izabela

doi:10.1016/j.cattod.2008.07.012

Cited by 28 publications

(14 citation statements)

References 23 publications

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“…Niobium(V)-containing mesoporous silica catalysts in epoxidation reactions, indeed, comply with the main guidelines of Green and Sustainable Chemistry: they do not require hazardous corrosive reactants, avoiding the use of peroxoacids; they circumvent tedious separation and recovery techniques, thanks to their heterogeneous nature, and, by exploiting the oxidizing properties of hydrogen peroxide, only water and dioxygen, in the case of its decomposition, are formed [36][37][38]. Moreover, niobium-silica catalysts displaying a network of mesopores, either ordered or non-ordered, proved to be suitable solid catalysts where the epoxidation of bulky vegetable oil FAMEs can be carried out, thanks to the easy steric accessibility of their mesoporous channels to substrate molecules [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Epoxidation of Karanja (Millettia pinnata) Oil Methyl Esters in the Presence of Hydrogen Peroxide over a Simple Niobium-Containing Catalyst

et al. 2019

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The synthesis, characterization and catalytic performance of a conceptually simple, novel NbOx-SiO2 catalyst are here described. The niobium(V)-silica catalyst was prepared starting from cheap and viable reactants, by alkaline deposition of NH4Nb(C2O4)2·H2O in the presence of fructose as a stabilizer and subsequent calcination. The NbOx-SiO2 solid (0.95 Nb wt.%) was tested in the liquid-phase epoxidation with aqueous hydrogen peroxide of methyl oleate, as a model substrate. It was then tested in the epoxidation of a mixture of methyl esters (FAMEs) obtained by transesterification with methanol and purification of karanja oil, extracted from the autochthonous Indian variety of Millettia pinnata tree. The catalyst showed a promising performance in terms of methyl oleate conversion (up to 75%) and selectivity to epoxide (up to 82%). It was then tested on the FAME mixture from karanja oil, where interesting conversion values were attained (up to 70%), although with lower selectivities and yields to the mixture of desired epoxidized FAMEs. The solid withstood four catalytic cycles overall, during which a non-negligible surface reorganization of the Nb(V) sites was observed. However, this restructuring did not negatively affect the performance of the catalysts in terms of conversion or selectivity.

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Section: Introductionmentioning

confidence: 99%

Epoxidation of Karanja (Millettia pinnata) Oil Methyl Esters in the Presence of Hydrogen Peroxide over a Simple Niobium-Containing Catalyst

et al. 2019

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“…Particularly, these Nb-PMOs almost quantitatively converted unsaturated fatty acid methyl esters. In addition, Ti-PMOs and Nb-PMOs were excellent catalysts for the ammoximation of cyclic ketones 251 and the oxidation of stearic acid, 250 respectively. Cr-PMOs have also been prepared by using either BTEE or BTEE/TEOS 252 In general, the more hydrophobic character (i.e., organic content), the higher activity per metal center, and so metalsubstituted PMOs are usually more active and selective than their silica counterparts.…”

Section: Catalysis By Metal Sites In Pmosmentioning

confidence: 99%

“…Ti-PMOs were found to be moderately active toward the selective epoxidation of a-pinene 246 and 1-octene 247 with 30% H 2 O 2 and TBHP, respectively. Also, Sn 248 and V-substituted 249 ethane-PMOs and Nb-substituted ethane-and octane-PMOs 250 were used as catalysts in the epoxidation of different olefins with H 2 O 2 as oxidant. Particularly, these Nb-PMOs almost quantitatively converted unsaturated fatty acid methyl esters.…”

Section: Catalysis By Metal Sites In Pmosmentioning

confidence: 99%

Periodic Mesoporous Organosilicas: from simple to complex bridges; a comprehensive overview of functions, morphologies and applications

et al. 2013

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Periodic Mesoporous Organosilicas (PMOs) were developed in 1999 and are basically ordered templated mesoporous organosilicas, prepared by the combination of a surfactant as template and a silsesquioxane as the organosilica precursor. They were one of the first examples of the so-called "hybrid" organic/inorganic materials. In the years that followed, an amazing variety of functional groups, morphologies and applications has been developed. Some of these high-end applications, like low-k buffer layers in microelectronics, chiral catalysts, chromatographic supports, selective adsorbents and light-harvesting devices, have clearly shown their potential. In this review, we will give a comprehensive overview of all these different functionalities and applications that have been created for Periodic Mesoporous Organosilicas.

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“…Recently, the catalysts containing niobium have drawn much attention in the field of the oxidation reactions. Mesoporous Nb-containing silicates obtained by various procedures have been active catalysts for epoxidation of olefins in the presence of hydrogen peroxide as an oxidizing agent (Nowak et al, 2003 ; Kilos et al, 2005 ; Nowak and Ziolek, 2005 ; Feliczak et al, 2009 ; Feliczak-Guzik and Nowak, 2009 ; Selvaraj et al, 2009 ; Nowak, 2012 ; Gallo et al, 2013 ; Tiozzo et al, 2014 , 2015 ; Ivanchikova et al, 2015 ; Thornburg et al, 2015 ; Turco et al, 2015 ).…”

Section: Catalysis On Niobium-containing Mesoporous Silicatesmentioning

confidence: 99%

Toward Exploiting the Behavior of Niobium-Containing Mesoporous Silicates vs. Polyoxometalates in Catalysis

2018

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Classification of polyoxometalates (POMs) is based on their chemical composition, basically represented by two general formulae: a) [MmOy]p− b) [XxMmOy]q−, where M is the main transition metal, O is the oxygen atom and X can be a non-metal atom such as Si. Additionally, in the most cases, the structure of the polyoxometalates is derived from a combination of octahedral units MO6 with a central metal atom M and the oxygen atoms placed at their corners. In such octahedra, oxygen atoms allow the condensation between two octahedral units, while one oxygen atom (or max. two atoms) makes double bond with the central metal atom and is not shared with other metal atoms within the complex (terminal oxygens). On the other hand, niobium-containing mesoporous silicates contain mainly MO4 tetrahedra and reveal superior activity in heterogeneous catalysis. Thus, the proper coordination of niobium is crucial for the catalytic activity and will be deeply discussed. The similarity in the catalytic behavior of niobium-polyoxometalates and heterogeneous niobium single-site catalysts in selective oxidations will be demonstrated.

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The use of mesoporous molecular sieves containing niobium for the synthesis of vegetable oil-based products

Cited by 28 publications

References 23 publications

Epoxidation of Karanja (Millettia pinnata) Oil Methyl Esters in the Presence of Hydrogen Peroxide over a Simple Niobium-Containing Catalyst

Epoxidation of Karanja (Millettia pinnata) Oil Methyl Esters in the Presence of Hydrogen Peroxide over a Simple Niobium-Containing Catalyst

Periodic Mesoporous Organosilicas: from simple to complex bridges; a comprehensive overview of functions, morphologies and applications

Toward Exploiting the Behavior of Niobium-Containing Mesoporous Silicates vs. Polyoxometalates in Catalysis

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