Catalyst For Oxidation Of Sulfides Research Articles

Correction to “Thermoresponsive Polymeric Nanoparticles as Efficient Pickering Interfacial Catalysts for Selective Oxidation of Sulfides”

Correction to “Thermoresponsive Polymeric Nanoparticles as Efficient Pickering Interfacial Catalysts for Selective Oxidation of Sulfides”

Thermoresponsive Polymeric Nanoparticles as Efficient Pickering Interfacial Catalysts for Selective Oxidation of Sulfides

Thermoresponsive Polymeric Nanoparticles as Efficient Pickering Interfacial Catalysts for Selective Oxidation of Sulfides

Natural bentonite/cellulose/vanadium novel complex nanopolymer complex catalyst: Synthesis, characterization, and oxidation activity of several organic compounds

The first bentonite catalyst for oxidation of sulfides and oxidative coupling of thiols was fabricated. This novel catalyst was included natural bentonite, extracted cellulose from wheat wastes, and vanadium complex (Cell/Bent@V nanocomposite). It was characterized using SEM, TEM, ICP, AFM, XRD, XPS, and FT-IR. Further, oxidation of primary and secondary of alcohols were considered to show its catalytic potential for the various substrates. High yield, excellent conversion, and selectivity were observed for oxidation reactions catalyzed by Cell/Bent@V nanocomposite. Cel/Ben/V nanocomposite was shown the excellent stability and activity confirming by SEM, XRD, and FT-IR of recycled catalyst. Finally, the effect of ultrasonic irradiation instead of stirring on the oxidation reaction was evaluated. The high yields and conversions in the less times were observed.

Nickel(II) unsymmetrical Schiff base complex immobilized into three dimensional mesoporous silica KIT-6: a novel and efficient catalyst for selective oxidation of sulfides to sulfoxides

Nickel(II) unsymmetrical Schiff base complex immobilized into three dimensional mesoporous silica KIT-6: a novel and efficient catalyst for selective oxidation of sulfides to sulfoxides

Catalysts based on nickel salt heteropolytungstates for selective oxidation of diphenyl sulfide

Abstract Nickel salts of Keggin heteropolytungstates with the general formula Ni x A y W12−y O39or40 (A = Si/P) were synthesized and studied as bulk catalytic materials or supported ones by deposition on modified and functionalized clay minerals (pillared layered clay and porous clay heterostructure). Characterizations by Raman, 31P and 29Si-NMR, and ESEM-EDS techniques showed that pure and supported systems preserved the Ni/W ratio and the expected structural properties of heteropolyanions. These materials were evaluated as catalysts in the selective oxidation of sulfides to sulfoxides or sulfones, using aqueous hydrogen peroxide and mild reaction conditions. The bulk materials, with a higher content of Ni, displayed a remarkable catalytic behavior in the oxidation of diphenyl sulfide (Ni3PW11NiO40H, 90% conversion in 15 min at 75°C, 100% sulfone selectivity in 3 h). Supported catalysts, particularly the non-functionalized PCH (Ni2SW12O40/PCH), showed excellent activity, with also being selective in the oxidation of sulfide to sulfoxide (87% conversion, 88.9% sulfoxide selectivity). The reuse of these materials was studied in the optimum reaction conditions, resulting in similar activity and selectivity.

Introducing Structural Diversity: Fe2(MoO4)3 Immobilized in Chitosan Films as an Efficient Catalyst for the Selective Oxidation of Sulfides to Sulfones

AbstractThis work reports how the immobilization of Fe2(MoO4)3 in chitosan films affects the oxidation reaction of sulfide derivatives to sulfates in the dark, resulting in good yields and excellent selectivity. As demonstrated, a variety of substituted sulfides were tolerated even in the presence of oxidative‐sensitive functional groups, leading to a regioselective application of the catalyst under mild reaction conditions and guaranteeing its reuse for at least 6 cycles without losing its catalytic performance. Specifically, films containing 1 mg of Fe2(MoO4)3 per ml of chitosan showed a yield and selectivity of 99 %. The key success of the selective oxidation was associated with the presence of the hydroxyl radical, ⋅OH, and the Fe3+/Fe2+ Fenton‐like process. As a proof of concept, the selective oxidation of sulfides to the corresponding sulfones was performed to demonstrate the synergistic effect between Fe2(MoO4)3 and chitosan. This work offers a design strategy for efficient catalysts that may extend to other semiconductors and oxidation processes.

Hollow Ag/Mn(btc): As highly efficient catalyst for oxidation of sulfides to sulfoxides

Hollow Ag/Mn(btc): As highly efficient catalyst for oxidation of sulfides to sulfoxides

PH-controlled assembling of POM-based metal–organic frameworks for use as supercapacitors and efficient oxidation catalysts for various sulfides

Two 3D POM-based metal–organic frameworks were prepared, which can be applied as electrode materials for supercapacitors, as well as efficient heterogeneous catalysts for the selective oxidation of sulfides to their corresponding sulfoxides.

New pyrimidine-amide-tetrazole ligand derived polyoxometalate-based copper complexes as catalysts for sulfide-sulfoxide transformation and electrochemical sensors

A new organic ligand was constructed by linking pyrimidine and tetrazole group through amide bond and used to build POM-based metal–organic complexes that can be used as catalysts for the catalytic oxidation of sulfides and electrochemical sensors.

Decagram-scale synthesis of heterometallic Ag/Ti cluster as sustainable catalyst for selective oxidation of sulfides

Atomically precise heterometallic clusters constitute a new family of model catalysts for understanding the fundamental catalysis process widely occurred in supported nanocatalysts, however, their syntheses and structure/composition modulations are nonetheless daunting challenges. Herein, three novel heterometallic Ag/Ti clusters with different Ag-doping ratios, Ag4Ti14, Ag4Ti6 and Ag4Ti2, have been readily synthesized in decagram-scale quantities through ligand engineering strategy. Thereinto, Ag4Ti2 can be efficiently prepared within 3 h in a quite high yield > 95 %. More remarkably, Ag4Ti2 shows unprecedented catalytic activity (>90 % conversion within 1 min) and selectivity (nearly 100 %) towards oxidation of thioethers with a wide substrate scope even including notorious 2-chloroethyl ethyl sulfide (CEES) at room temperature (turnover frequency = 11,880 h−1), which is mainly attributed to its full-surface-exposure-doping Ag atoms (affinity for binding of substrate) on TiO support and their cooperativity, whereas the other two are not the same case. Moreover, the Ag4Ti2 is highly robust in catalysis process and can be readily recovered and reused at least six cycles without observable loss of activity and selectivity, enabling this cluster hold great promise in industrial applications. This work not only establishes a general method to scale-up synthesis of Ag/Ti clusters but also provides an atom-precise model catalyst to understand the structure–property correlations of real-world conventional nanocatalysts such as silver doped-TiO2 nanoparticles.

Anderson-type polyoxometalate-based sandwich complexes bearing a new “V”-like bis-imidazole-bis-amide ligand as electrochemical sensors and catalysts for sulfide oxidation

By introducing a new “V”-like semirigid bis-imidazole-bis-amide ligand, 4,4’-bis(1<i>H</i>-imidazole-4-carboxamide)phenylmethane (L), into a reaction system containing Anderson-type polyoxoanions, three polyoxometalate-based metal–organic complexes (POMOCs) with different metal ions were successfully synthesized under solvothermal conditions. The as-prepared POMOCs [Zn₂L₂(H₂O)₄][Zn(H₂O)₂(TeMo₆O₂₄)]·9H₂O (<strong>1</strong>), [Ni(H₂O)₆][Ni₂L₂(H₂O)₂[AlMo₆(OH)₆O₁₈]₂]·9H₂O (<strong>2</strong>), and [Co(H₂O)₆][Co₂L₂(H₂O)₂[AlMo₆(OH)₆O₁₈]₂]·11.5H₂O (<strong>3</strong>) show sandwich-like supramolecular structures. Complexes <strong>2</strong> and <strong>3</strong> are isostructural, having two [ML(H₂O)₂]²⁺ chains with [AlMo₆(OH)₆O₁₈]³⁻ polyoxoanions as pendants arranged in an interdigital mode to construct the sandwich-like architecture, whereas in complex <strong>1</strong> the anionic [Zn(H₂O)₂(TeMo₆O₂₄)]⁴⁻ chain is sandwiched by two cationic [ZnL(H₂O)₂]²⁺ chains to generate the supramolecular structure. POMOCs <strong>1</strong>–<strong>3</strong> display excellent electrochemical sensing behavior for Cr(VI), Fe(III), BrO₃⁻, and NO₂⁻ ions and efficient catalytic performance in sulfide oxidation. The effect of the central metal on the electrochemical sensing and sulfide oxidation performance and that of the special architecture of <strong>1</strong> on the detection ability are discussed.

Tribromide immobilized on surface of magnetic nanoparticles modified tris(triazine-triamine): A versatile and highly active catalyst for oxidation of sulfides and oxidative coupling of thiols

In this article, we show that tribromide heterogenized on the surface of silica-coated magnetic nanoparticles modified with N2,N4,N6-tris(aminomethyl)-1,3,5-triazine-2,4,6-triamine [Fe3O4@SiO2-tris(triazine-triamine)-Br3] is a novel and efficient reusable nanocatalyst for the oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides using hydrogen peroxide as green oxidant. The structure of the as-fabricated Fe3O4@SiO2-tris(triazine-triamine)-Br3 was characterized by a series of spectroscopic techniques including FT-IR spectroscopy, SEM, TEM, EDX, VSM, XRD and TGA techniques. TEM and SEM analysis confirmed that the typical silica shell thickness was assessed to be around 20 nm. Recycling studies revealed that the Fe3O4@SiO2-tris(triazine-triamine)-Br3 could be easily recovered by a simple magnetic separation and recycled at least 6 times without deterioration in catalytic activity.

Hepta-Zr-Incorporated Polyoxometalate Assembly.

Driven by the synergistic-directing effect of the lacunary fragments, [B-α-GeW9O34]10- and [B-α-GeW11O39]8-, an unprecedented hepta-Zr-substituted polyoxometalate (POM) assembly K2Na6H10(Hpy)3[SbZr7O6(OH)4(B-α-GeW9O34)2(B-α-GeW11O39)2]·28H2O (1) was made under hydrothermal condition and structurally characterized. Of which, a unique hepta-Zr cluster, [SbZr7O6(OH)4]15+ core, was built by two trilacunary [B-α-GeW9O34]10- fragments and two monolacunary [B-α-GeW11O39]8- fragments and further arranged in a mode of a vertical cross and formed a pseudo-tetrahedron geometry. Compound 1 features the first Zr7-cluster-substituted POM. Moreover, 1 is an effective heterogeneous catalyst for the catalytic oxidation of sulfides into the corresponding sulfones with H2O2, manifesting distinguished conversion, excellent yield, and desired recyclability.

A highly efficient heterogeneous catalyst for selective oxidation of sulfides derived from an open-framework copper borovanadate containing a unique crown-shaped anion.

A novel 3D open-framework copper borovanadate with a unique crown-shaped anion [(VIVO)8(VVO)4B32O64(OH)8]12- and the largest ratio of Cu2+/borovanadate anions (6/1) has been successfully synthesized and systematically studied. The compound not only possesses high stability in a wide pH range of 3.2-10.8 (DMF solution), but also exhibits excellent catalytic activities for selective oxidation of sulfides.

Fabrication of La (III) supported on CoFe2O4 MNPs: a novel and efficient heterogeneous catalyst for selective oxidation of sulfides and synthesis of symmetrical disulfides

Fabrication of La (III) supported on CoFe2O4 MNPs: a novel and efficient heterogeneous catalyst for selective oxidation of sulfides and synthesis of symmetrical disulfides

Selectivity adjustment of Fe3O4 MNPs based silver catalyst in oxidation of sulfides with classical and ultrasonic methods and synthesis of 5-substituted 1H-tetrazoles from aryl nitriles in water

The surface of the Fe3O4 has been functionalized with 3-chloropropyltrimethoxysilane, which undergoes an SN2 substitution reaction of the chloro group with the nitrogen of ligand (creatinine), offering the Fe3O4@Creatinine. A new recyclable Ag attached Fe3O4 MNPs (Fe3O4 @Creatinine@Ag) has been produced through a post-synthetic method. FT-IR (Fourier Transforms Infrared), TGA (Thermogravimetric Analysis), XRD (X-ray Diffraction), EDS (Energy-Dispersive X-ray Spectroscopy) and VSM (Vibrating Sample Magnetometer) confirm the effectiveness of the performed chemical modification to synthesize the catalyst. This catalyst displays high catalytic performance in the synthesis of 5-substituted 1H-tetrazoles in water and the selective oxidation of sulfides. In the presence of nano- Fe3O4 @Creatinine@Ag as an efficient heterogeneous nano-catalyst, the corresponding 5-substituted 1H-tetrazoles and sulfoxide were afforded under the mild condition in good to excellent yields. A wide variety of sulfides furnished the corresponding sulfoxide with classical and ultrasonic methods. The results show that ultrasonic is an appropriate method for the oxidation of sulfides to the related sulfoxide. The catalyst can be separated by simple recovery and reused for several periods without any remarkable decrease in the catalysis activity and selectivity.In the synthesis of this catalyst, the environmentally friendly ligand is used to stabilize the eco-friendly active site on the desired support. What distinguishes this catalyst and this research is its high eco-friendliness in several respects. The structure of this catalyst and also, the reaction are based on green chemistry. At a relatively low temperature compared to the reported work, tetrazole derivatives are prepared in water solvent with good efficiency.

Tungstate supported on magnetic ionic liquid-modified graphene oxide as an efficient and recyclable catalyst for the selective oxidation of sulfides

An effective and recyclable catalyst based on tungstate ion immobilization on magnetic ionic liquid modified graphene oxide (WO4@Fe3O4/GO-IL) has been synthesized in this research. The catalyst was characterized by various techniques such as Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, electron microscopy transmission and scanning, and vibrating sample magnetometer. Also, for the selective oxidation of sulfides to the corresponding sulfoxides, the as-synthesized catalyst was investigated. Additionally, the WO4@Fe3O4/GO hybrid was used to study the role of ionic liquid in this transformation and, the observed yield of methyl phenyl sulfoxide was remarkably inferior. Also, by using an external magnet, the catalyst can be quickly retrieved and recycled successfully in five following reaction cycles without any significant reduction in activity and selectivity of the catalyst.

Decavanadate‐based Transition Metal Hybrids as Bifunctional Catalysts for Sulfide Oxidation and C—C Bond Construction

Main observation and conclusionThe development of bifunctional catalysts has drawn much attention in realizing efficient and feasible catalytic systems to meet the diverse demand of potential industrial applications. Design of stable and powerful bifunctional catalysts for various catalysis systems is highly desirable yet largely unmet. Here, three kinds of decavanadate‐based transition metal hybrids (DTMH) (i.e., Co‐DTMH, Ni‐DTMH and Ag‐DTMH) have been successfully synthesized through a pH tuning strategy and further characterized. Specifically, the rare MO5N six‐coordinated transition metal coordination modes have been detected in Co‐DTMH and Ni‐DTMH, while Ag atoms in Ag‐DTMH exhibited three‐ and five‐coordinated geometries with the tuning of specially selected imidazole ligands. Thus‐obtained clusters can serve as powerful bifunctional catalysts for both sulfide oxidation and C—C bond construction. Remarkably, Ag‐DTMH demonstrated excellent heterogeneous bifunctional catalytic properties in the selective oxidation of sulfides and construction of C—C bond (yields up to 99%), which enable successful recycling for three cycles with remained catalytic activities and structure stability. The newly designed decavanadate‐based transition metal hybrids with bifunctional property hold high promise in the practical applications like continuous catalysis or flow bed reactions.

Dysprosium (III) Supported on CoFe2O4 MNPs as a Heterogeneous Catalyst for the Selective Oxidation of Sulfides and Synthesis of Symmetrical Disulfides

A magnetic catalyst based on immobilization of dysprosium ions on the surface of CoFe2O4 nanoparticles has been reported and used as an efficient magnetic nanocatalyst for the selective oxidation of organic sulfides and synthesis of symmetrical disulfides containing aromatic and aliphatic sulfides and thiols. The magnetic solid catalyst has been identified using TGA, FT-IR, VSM, ICP, SEM, and XRD. Moreover, the catalyst can also be separated with an external magnet and recycled several times without any remarkable decrease in its catalyst activity.

Surface decorated magnetic nanoparticles with Mn-porphyrin as an effective catalyst for oxidation of sulfides

Mn-porphyrin complex was anchored coordinatively to silica-coated surface of magnetic nanoparticles (SMNP). Afterward, a heterogeneous nanocatalyst (Fe3O4@SiO2-MnTCPP) has been characterized by Fourier transform infrared (FT-IR), ultraviolet-visible (UV-vis) spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA), and transmission electron microscope (TEM). A thermal stability up to around 350[Formula: see text]C was verified for prepared nanocatalyst based on thermogravimetric analysis. Finally, the catalytic performance of magnetically recoverable Mn-catalyst was exploited in the green oxidation of different sulfides with urea hydrogen peroxide (UHP) in the presence of imidazole as co-catalyst in ethanol under heterogeneous conditions. The eco-friendly property of ethanol strongly induced us to employ it as the reaction solvent in this oxidation system. Complete conversion ([Formula: see text]99) of sulfides to the corresponding sulfoxide or sulfones was obtained for ethyl phenyl sulfide, phenyl vinyl sulfide, diallyl sulfide, thiocyanatoethane, 2-ethyl mercaptoethanol and tetrahydrothiophene. Moreover, the recovered catalysts keep constant conversion yield up to at least three cycles.