CuWO4 as a photocatalyst for room temperature aerobic benzylamine oxidation

2018 ◽  
Vol 54 (9) ◽  
pp. 1101-1104 ◽  
Author(s):  
Aaron D. Proctor ◽  
Shobhana Panuganti ◽  
Bart M. Bartlett
Keyword(s):  
Oxidative Coupling ◽  
Oxidation Reaction ◽  
Room Temperature ◽  
Photo Oxidation

We report the first example of a controlled photo-oxidation reaction on CuWO4, the aerobic oxidative coupling of benzylamine.

Stacking-induced different performance of mechanochromic luminescence and room-temperature phosphorescence based on two analogous AIEgens synthesized by a green photo-oxidation reaction

2021 ◽  
Author(s):  
Yue Yu ◽  
Jianai Chen ◽  
Sijie Tan ◽  
Changjiang Zhou ◽  
Weijun Li ◽  
...  
Keyword(s):  
Oxidation Reaction ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Aggregation State ◽  
Photo Oxidation ◽  
Mechanochromic Luminescence

We reported two similar AIEgens obtained by photo-oxidation reaction. They exhibited different luminescence behaviors in aggregation state due to the different stacking manners, especially the distance and overlapping areas between the molecules.

Room temperature selective oxidation of aniline to azoxybenzene over a silver supported tungsten oxide nanostructured catalyst

2015 ◽  
Vol 17 (3) ◽  
pp. 1867-1876 ◽  
Author(s):  
Shilpi Ghosh ◽  
Shankha S. Acharyya ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Silver Nanoparticles ◽  
Tungsten Oxide ◽  
Selective Oxidation ◽  
Oxidative Coupling ◽  
Room Temperature ◽  
Heterogeneous Catalysts ◽  
Nanostructured Catalyst ◽  
Important Chemical

Heterogeneous catalysts comprising silver nanoparticles supported on nanostructured tungsten oxide were applied for room temperature oxidative coupling of aniline to azoxybenzene, an important chemical intermediate and a chemical of industrial interest.

scholarly journals Characterization of iodine particles with Volatilization-Humidification Tandem Differential Mobility Analyser (VH-TDMA), Raman and SEM techniques

2006 ◽  
Vol 6 (1) ◽  
pp. 1481-1508 ◽  
Author(s):  
Z. D. Ristovski ◽  
C. Fletcher ◽  
B. D’Anna ◽  
G. R. Johnson ◽  
J. T. Bostrom
Keyword(s):  
Room Temperature ◽  
Stoichiometric Ratio ◽  
Hygroscopic Growth ◽  
High Solubility ◽  
Differential Mobility ◽  
Photo Oxidation ◽  
Mobility Diameter ◽  
Humidity Range ◽  
Scanning Electron

Abstract. Particles formed upon photo-oxidation of CH2I2 and particles of I2O5 and HIO3 have been studied using a Volatilisation and Humidification Tandem Differential Mobility Analyser (VH-TDMA) system. Volatilization and hygroscopic behaviour have been investigated as function of temperature (from 25 to 400°C), humidity (RH from 80 to 98%), initial aerosol sizes (from 27 to 100 nm mobility diameter) and in nitrogen or air as the sheath gasses. The volatility behaviour of particles formed upon photo-oxidation of CH2I2 is more similar to that of HIO3 particles in a filtered sheath air than in nitrogen, with the particle shrinkage occurring at 190°C and accompanied by hygroscopic growth. Despite its high solubility, HIO3 was found not to be hygroscopic at room temperature with no significant growth displayed until the thermodenuder temperature reached 200°C or above when the particles have transformed into I2O5. Diiodopentaoxide (I2O5) particles exhibit relatively low hygroscopic growth factors of 1.2–2 in the humidity range investigated. Scanning Electron Microscopy (SEM) of particles formed upon photo-oxidation of CH2I2 shows that their primary elemental components were iodine and oxygen in a stoichiometric ratio of approximately 1:2 with 10% error. Both Raman spectra and SEM show poor crystallinity for all the aerosols produced.

Rapid Nucleation of Reduced Graphene Oxide-Supported Palladium Electrocatalysts for Methanol Oxidation Reaction

2019 ◽  
Vol 19 (11) ◽  
pp. 7236-7243
Author(s):  
Jen Chao Ng ◽  
Chou Yong Tan ◽  
Boon Hoong Ong ◽  
Atsunori Matsuda ◽  
Wan Jefrey Basirun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Oxidation Reaction ◽  
Room Temperature ◽  
Methanol Oxidation Reaction ◽  
Ph Adjustment ◽  
Reduced Graphene ◽  
High Supersaturation ◽  
Supported Palladium

Small sized electrocatalysts, which can be obtained by rapid nucleation and high supersaturation are imperative for outstanding methanol oxidation reaction (MOR). Conventional microwave synthesis processes of electrocatalysts include ultrasonication, stirring, pH adjustment, and microwave irradiation of the precursor mixture. Ethylene glycol (EG), which serves as a reductant and solvent was added during the ultrasonication or stirring stage. However, this step and pH adjustment resulted in unintended multi-stage gradual nucleation. In this study, the microwave reduction approach was used to induce rapid nucleation and high supersaturation in order to fabricate small-sized reduced graphene oxide-supported palladium (Pd/rGO) electrocatalysts via the delayed addition of EG, elimination of the pH adjustment step, addition of sodium carbonate (Na2CO3), prior microwave irradiation of the EG mixed with Na2CO3, and addition of room temperature precursor mixture. Besides its role as a second reducing agent, the addition of Na2CO3 was primarily intended to generate an alkaline condition, which is essential for the high-performance of electrocatalysts. Moreover, the microwave irradiation of the EG and Na2CO3 mixture generated highly reactive free radicals that facilitate rapid nucleation. Meanwhile, the room temperature precursor mixture increased supersaturation. Results showed improved electrochemically active surface area (78.97 m2 g−1, 23.79% larger), MOR (434.49 mA mg−1, 37.96% higher) and stability.

Ecofriendly approach for detection of phenols in water using laccase from different fungi

2012 ◽  
Vol 66 (2) ◽  
pp. 385-393 ◽  
Author(s):  
Mazaahir Kidwai ◽  
Arti Jain ◽  
Abha Sharma ◽  
Ramesh Chander Kuhad
Keyword(s):  
Oxidative Coupling ◽  
Present Method ◽  
Oxidation Reaction ◽  
Laccase Activity ◽  
Environmental Concerns ◽  
Coupling Reactions ◽  
Substituted Phenols ◽  
Pycnoporus Cinnabarinus ◽  
Simple Phenol ◽  
Oxidative Coupling Reactions

Laccase-initiated oxidative coupling reactions of phenol and its derivatives with 4-aminoantipyrene using air as an oxidant has been investigated. The oxidation reaction of phenols and 4-aminoantipyrene is getting a lot of attention due to environmental concerns. Oxidation of simple phenol and 4-aminoantipyrene as a benchmark reaction enabled us to rank the relative oxidation ability of various laccases. Among the laccases tested, laccase from Pycnoporus cinnabarinus successfully yielded 72% antipyrilquinoneimine dye. The present method can also be used to determine p-substituted phenols and chlorophenols. In this work, the influence of mediators on laccase activity has also been studied.

Reactions of 7-azaindole with niobium and tantalum pentachlorides and coupling to the azaindolyl-azaindolium cation

1994 ◽  
Vol 72 (7) ◽  
pp. 1675-1683 ◽  
Author(s):  
Jacques Poitras ◽  
André L. Beauchamp
Keyword(s):  
Infrared Spectroscopy ◽  
Nmr Spectroscopy ◽  
Crystal Structures ◽  
Infrared Spectra ◽  
Oxidative Coupling ◽  
Room Temperature ◽  
H Nmr ◽  
Counter Ion ◽  
Distorted Octahedral ◽  
Complex Salts

The reaction of NbCl5 and TaCl5 with 7-azaindole (Haza) at room temperature in benzene or dichloromethane yielded MCl5(Haza) addition compounds. Under more severe conditions, the same compound was obtained with TaCl5. For NbCl5, some reduction to Nb(IV) was observed and NbCl5(Haza), NbCl4(Haza)2, and the (H2aza)+ ion were identified in the reaction mixture by infrared spectroscopy. Oxidative coupling of two azaindole units via N7—C6 also took place during the reaction, since the 7-(azaindol-6-yl)azaindolium cation was found as counter-ion in the crystal structures of two complex salts. In the crystals of (H2aza-aza)[NbOCl4(Haza)]•0.5CH2Cl2([Formula: see text]a = 7.255 Å, b = 12.412 Å, c = 14.277 Å, α = 89.03°, β = 85.60°, γ = 76.66°, Z = 2, R = 0.062), the anion is the roughly octahedral [NbOCl4(azaindole)]− species containing a neutral N7-coordinated azaindole trans to the Nb=O bond. The [NbOCl5]2− salt ([Formula: see text]a = 7.527 Å, b = 10.168 Å, c = 10.467 Å, α = 66.41°, β = 84.07°, γ = 85.51°, Z = 1, R = 0.037) contains the distorted octahedral [NbOCl5]2− ion disordered over two orientations. The infrared spectra suggest monomeric octahedral structures for the MCl5(Haza) and NbCl4(Haza)2 complexes. 1H NMR spectroscopy shows that NbCl5(Haza) is not dissociated in CD2Cl2.

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