Influence of substituents and ligands of various cobalt (II) porphyrin derivatives coordinately bonded to silica on the oxidation of mercaptan

Buck, T.; Bohlen, Heike; Wöhrle, Dieter; Schulz‐Ekloff, G.; Andreev, A.

doi:10.1016/0304-5102(93)85082-5

Cited by 75 publications

(30 citation statements)

References 28 publications

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“…Step (2) involves the formation of the precursor or adduct. Electron-withdrawing groups should favor step 2 since they should favor the formation of the adduct.…”

Section: Oxidation Of 2-mercaptoethanolmentioning

confidence: 99%

Effect of the Substituents on the Ligand of Iron Phthalocyanines Adsorbed on Graphite Electrodes on Their Activity for the Electrooxidation of 2-Mercaptoethanol

et al. 2002

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“…Step (2) involves the formation of the precursor or adduct. Electron-withdrawing groups should favor step 2 since they should favor the formation of the adduct.…”

Section: Oxidation Of 2-mercaptoethanolmentioning

confidence: 99%

Effect of the Substituents on the Ligand of Iron Phthalocyanines Adsorbed on Graphite Electrodes on Their Activity for the Electrooxidation of 2-Mercaptoethanol

et al. 2002

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“…The silica contains L0.8-12 lmol g -1 metal complex moieties. [117,148] Binding by Ionic Bonds Electrostatic binding occurs easily by ionic interactions between oppositely charged macromolecular carriers and phthalocyanines.…”

Section: Binding By Coordinative Bondsmentioning

confidence: 99%

“…The formation of Co(I)Pc after oxidation of the thiolate or even after adsorption of the thiol was analyzed by visible reflectance spectra. With regard to the redox potentials of all involved species (CoPc, thiol, O 2 ) in the first step, it is assumed that RS -coordinates at the Co(II) centers under formation of RS9, then RSSR9 -and Co(I) centers (Equation (24) [70,116,117,148,181,184] and for the catalytic oxidation of sulfide. [185] …”

Section: Catalytic Oxidations Of Sulfur Compoundsmentioning

confidence: 99%

“…Coordinative Binding of Different Porphyrins 1, 2, 3 at the Surface of Silica Modified by Imidazoyl Groups [117,148] Different types of silica dried at 200 8C under vacuum were supplied (see above) and placed in a 250 ml flask with 150 ml dry m-xylene. 2 g (10 mmol) 3-chloropropyltrimethyloxysilane and 1.4 g (20 mmol) imidazole were added, and the mixture was refluxed for 8 h. Excess imidazole was used to bind the hydrochloric acid formed.…”

Section: Type IVmentioning

confidence: 99%

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Phthalocyanines in Macromolecular Phases - Methods of Synthesis and Properties of the Materials

Wöhrle¹

2001

Macromol. Rapid Commun.

108

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Phthalocyanines (Pc) and related macrocycles in combination with organic or inorganic macromolecules are reviewed. From the structural point of view, the macrocyclic compounds in macromolecular phases are subdivided into five types. Syntheses are described in detail, and characteristic experimental procedures are given. The properties of the materials are discussed: conductivity and photoconductivity, electrical charge/discharge, electrocatalytic reductions, photocatalytic reductions/oxidations of and at thin film electrodes, catalytic and photocatalytic oxidations, photoinduced electron transfer.

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“…As regards the reactions of oxidation involving the dioxygen as the oxidizer, we find especially in the literature the use of cobalt phthalocyanine supported in oxidation of thiols to disulfures in oil distillates [12,13].…”

Section: Introductionmentioning

confidence: 99%

New Process of Catalytic Oxidation of Organic Pollutants from Water in Soft Conditions in Presence of Sulfonated Cobalt Phthalocyanines Supported on Activated Carbon

Goul

Mongi²

2017

Eco-Tech

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In the field of water treatment, catalytic oxidation has been developed around the Fenton reagent (hydrogen peroxide coupled with ferrous iron salt) but this oxidative system has drawbacks. In effect, this system only works in acidic pH. In addition, the Fenton reagent used at room temperature generally offers a partial oxidation of pollutants and is not accompanied by a significant removal of total organic carbon.The WPO process (Wet Peroxide Oxidation) that uses the catalytic activation of peroxide hydrogen at high temperature accelerates the kinetic of degradation reactions. But this method poses problems of cost due to the use of high temperatures reaching 140°C.In clean water, the oxygen is found mainly in the processes WAO (Wet Air Oxidation) which generates a huge investment because of high temperature and pressure (250 to 320 ° C -50 to 150 bar). This represents a major drawback in the industry.The catalytic oxidation reactions in the presence of métallophthalocyanines described in the literature involve KHSO 5 or H 2 O 2 which presents a disadvantage in a field of water depollution. Indeed, for the oxidation of trichlorophenol, adding an organic co-solvent is necessary: The reactions present the inconvenient to be conducted in a mixture acetonitrile / buffer (1 / 3, V / V) and not in an aqueous medium .Therefore, it appears that finding a method for oxidation catalysis involving transition metals and using oxygen under mild conditions of temperature and pressure is a particularly important challenge. During this work, we showed that the synthesis of a catalyst: phthaolocyanine cobalt sulfonated fixed on activated carbon is a simple process that takes place at room temperature. The action of these catalysts has been studied in the oxidation of hexanoic acid by oxygen in normal conditions (20 ° C, 1 atm.). We studied the reaction using two catalysts supported on activated carbon as grains, containing respectively 12 and 50 µmol / g cobalt. We showed that:https://doi.org/10.15626/Eco-Tech.2010.116Linnaeus ECO-TECH '10 Kalmar, Sweden, November 22-24, 2010 • the acid mineralization increases with the degree of grafting. In all cases, 97% of hexanoic acid is removed after 6h.• the behavior of catalysts has been studied through recycling. The catalyst with the lowest content in cobalt showed an increase of activity during the first four cycles. Such activity is stabilised with apparent values of the fall of total organic carbon (TOC) and chemical demand of oxygen (COD) of about 90 %. The increase of cobalt concentration enhances the rate of mineralization (expressed in relation to TOC eliminate d) from 45 % in the first cycle to 62 % at the third cycle. The loss of cobalt is very low. It is below 0,57 % after six cycles. We have also tested the catalytic action of this system in the succinic acid oxidation, oxalic acid and trichlorophenol. We obtain a quasi total fall of TOC and COD and an important rate of mineralization.All these consistent results, can validate this catalytic system. Especially s...

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Influence of substituents and ligands of various cobalt (II) porphyrin derivatives coordinately bonded to silica on the oxidation of mercaptan

Cited by 75 publications

References 28 publications

Effect of the Substituents on the Ligand of Iron Phthalocyanines Adsorbed on Graphite Electrodes on Their Activity for the Electrooxidation of 2-Mercaptoethanol

Effect of the Substituents on the Ligand of Iron Phthalocyanines Adsorbed on Graphite Electrodes on Their Activity for the Electrooxidation of 2-Mercaptoethanol

Phthalocyanines in Macromolecular Phases - Methods of Synthesis and Properties of the Materials

New Process of Catalytic Oxidation of Organic Pollutants from Water in Soft Conditions in Presence of Sulfonated Cobalt Phthalocyanines Supported on Activated Carbon

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