Catalytic properties of silica supported titanium, vanadium and niobium oxide nanoparticles towards the oxidation of saturated and unsaturated hydrocarbons

Martínez-Méndez, Susana; Henríquez, Yurgenis; Domínguez, Olgioly; D'Ornelas, Lindora; Krentzien, Heinz

doi:10.1016/j.molcata.2006.02.041

Cited by 56 publications

(34 citation statements)

References 22 publications

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“…This includes the use of metal complexes, 196 metal oxides 197,198 metal nanoparticles, 199,200 and investigation of both liquid and gas phase systems. 201 For example, the oxidation of cyclohexane over MoO 3 in gas phase, investigated by means of EPR spin trapping in aerobic and anaerobic conditions, showed evidence of a Mars and Van Krevelen mechanism.…”

Section: Cyclohexane Oxidation: An Exploited Case Of Autoxidationmentioning

confidence: 99%

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Liu

Ryabenkova

Conte

2015

Phys. Chem. Chem. Phys.

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The activation and use of oxygen for the oxidation and functionalization of organic substrates is among the most important reactions in a chemist's toolbox. Nevertheless, despite the vast literature on catalytic oxidation, the phenomenon of autoxidation, an ever-present background reaction that occurs in virtually every oxidation process, is often neglected. In contrast, autoxidation can affect the selectivity to a desired product, to those dictated by pure freeradical chain pathways, thus affecting the activity of any catalyst used to carry out a reaction.This critical review compares catalytic oxidation routes by transition metals versus autoxidation, particularly focusing on the industrial context, where highly selective and "green" processes are needed. Furthermore, the application of useful tests to discriminate between different oxygen activation routes, especially in the area of hydrocarbon oxidation, with the aim of an enhanced catalyst design, is described and discussed. In fact, one of the major targets of selective oxidation is the use of molecular oxygen as ultimate oxidant, combined with the development of catalysts capable to perform the catalytic cycle in a real energy and cost effective manner on a large scale. To achieve this goal, insights from metallo-proteins that could find application in some areas of industrial catalysis are presented, as well as considering the physicochemical principles that are at the fundament of oxidation and autoxidation processes.3

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Section: Cyclohexane Oxidation: An Exploited Case Of Autoxidationmentioning

confidence: 99%

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Liu

Ryabenkova

Conte

2015

Phys. Chem. Chem. Phys.

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“…The products were characterized using 1 H-NMR, 13 C-NMR and FT-IR. The findings show that the oxidant was particularly selective toward cis double bonds.…”

Section: Resultsmentioning

confidence: 99%

“…They demonstrated that cis and trans epoxy carbon absorptions appeared at 55 and 58 ppm, respectively. Focusing on the 115-120 and 140-150 ppm regions in the 13 C-NMR spectra, we found that the vinyl carbons remained unchanged as a result of their low electron density. Accordingly, the vinyl microstructures reacted more slowly than did the cis and trans stereoiso- mers.…”

Section: H-nmr Spectramentioning

confidence: 90%

“…For example, although peracids appear to be more effective than peroxides in epoxidation reactions, they have harmful effects on human health and gives rise to environmental pollution [12]. Another drawback is that epoxidation reactions are accompanied by several side-reactions, undesired by-products, and the need for higher temperatures to obtain higher conversions [13]. In addition, it has been found that at high reaction temperatures and longer times, the formation of side-products increases [14].…”

Section: Introductionmentioning

confidence: 99%

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Nanoclay-Mediated Epoxidation of HTPB Using In-Situ-Generated Dimethyl Dioxirane

Nikje

Hajifatheali

2011

Designed Monomers and Polymers

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This paper reports on the epoxidation of hydroxyl-terminated polybutadiene (HTPB) using in-situ-generated dimethyl dioxirane (DMD) as an oxidant and nanoclay as a phase-transfer catalyst (PTC) at 25 • C. The aim was to consider in detail the functionality of isomeric C=C bonds under different reaction circumstances combining reaction time and different percentages of PTC/oxone (w/w). The data revealed the selectivity in the oxidation of cis double bonds in comparison with trans and vinyl ones. The products were characterized using 1 H-NMR, 13 C-NMR and FT-IR; no side-reactions were observed. In addition, it was found that the hydroxyl group of the polymer chain remained unaffected in the epoxidation reaction although no conditional controls were implemented. It was proven that this method is easy and convenient and that the reaction conditions are straightforward.

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“…In order to improve the conversion efficiency, various nano-textures have been studied so far: for example in ZnO and NbO x , nanotubes [14] [15], nanowires [16] [17], nanoparticles [18] [19], nanorods [20] [21] and so on [22]- [26]. To the best of the authors' knowledge, PECs with a nano-island structure have never been reported, where nano-islands are two-dimensionally and separately distributed on a substrate, and they are not in a stacking structure with nano-particles.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Photoelectrochemical Properties of Nano-Islands of Zinc and Niobium Oxides Deposited on Aluminum Thin Film by RF Magnetron Reactive Sputtering

Sajiki¹,

Benino²,

Nanba³

et al. 2015

MSA

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Zinc oxide (ZnO) and niobium oxide (NbO x ) with a nano-island structure were deposited by a sputtering method on Al-coated glass substrates. Cells with a (ZnO or NbO x )/Al/glass|KNO 3 aq.|Al/ glass structure were assembled, and electrochemical and photoelectrochemical properties were evaluated. The ZnO and NbO x electrodes had higher electrode potentials than the counter Al/glass electrode, and electron flows from the counter electrode to the ZnO and NbO x electrodes through the external circuit were commonly confirmed. In the ZnO-based cell, only faint photocurrent generation was seen, where Zn and Al elution from the ZnO electrode was found. In the NbO xbased cell, however, stable generation of electricity was successfully achieved, and electrode corrosion was not recognized even in microscopic observations. A photoelectrochemical conversion model was proposed based on potential-pH diagrams. In the case of nano-island structures formed at shorter NbO x deposition time, it was concluded that the photoelectrochemical reactions, which were proceeded in the immediate vicinity of the boundary among nano-islands, substrate, and electrolyte solution, were predominant for the photoelectrochemical conversion, and in the case of film structures with longer deposition time, the predominant reactions took place at the film surface.

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Catalytic properties of silica supported titanium, vanadium and niobium oxide nanoparticles towards the oxidation of saturated and unsaturated hydrocarbons

Cited by 56 publications

References 22 publications

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Catalytic oxygen activation versus autoxidation for industrial applications: a physicochemical approach

Nanoclay-Mediated Epoxidation of HTPB Using In-Situ-Generated Dimethyl Dioxirane

Electrochemical and Photoelectrochemical Properties of Nano-Islands of Zinc and Niobium Oxides Deposited on Aluminum Thin Film by RF Magnetron Reactive Sputtering

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