Azoxybenzene

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Lei Wang - One of the best experts on this subject based on the ideXlab platform.

Rajaram Bal - One of the best experts on this subject based on the ideXlab platform.

  • low temperature catalytic oxidation of aniline to Azoxybenzene over an ag fe2o3 nanoparticle catalyst using h2o2 as an oxidant
    New Journal of Chemistry, 2019
    Co-Authors: Bappi Paul, Siddhartha Sankar Dhar, Sachin K Sharma, Shubhadeep Adak, Rubina Khatun, Gurmeet Singh, Dipak Das, Vedant Joshi, Sahil Bhandari, Rajaram Bal
    Abstract:

    An in situ modified hydrothermal synthesis of Ag/Fe2O3 nanoparticles (NPs) and studies of their catalytic activity as a simple, eco-friendly and recyclable catalyst for one-pot conversion of aniline to Azoxybenzene were performed. The as-synthesized nanostructured material was characterised by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), SEM-mapping, temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption isotherms (BET), Fourier transform infrared spectroscopy (FT-IR), inductively coupled plasma–atomic emission spectroscopy (ICP-AES), ultraviolet-visible spectroscopy (UV-vis) and vibrating sample magnetometer spectroscopy (VSM). The most active and recyclable catalyst with 2–5 nm diameters of the metallic Ag particles supported on 10–50 nm Fe2O3 nanoparticles was formed with a silver loading of 1.8 wt%. A high turnover number of ∼592 was achieved with 92% conversion of aniline and 94% selectivity towards the target product Azoxybenzene under atmospheric conditions. The effects of various reaction parameters including the reaction time, temperature and substrate to H2O2 molar ratio were screened and studied in detail. The results reveal the role of a synergistic effect between the surface Ag nanoparticles and Fe2O3 nanospheres for high catalytic activity.

  • room temperature selective oxidation of aniline to Azoxybenzene over a silver supported tungsten oxide nanostructured catalyst
    Green Chemistry, 2015
    Co-Authors: Shilpi Ghosh, Shankha S Acharyya, Takehiko Sasaki, Rajaram Bal
    Abstract:

    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. The catalytic protocol features high activity and selectivity to the target product Azoxybenzene with a turnover number of ∼368. The catalyst was characterized by XRD, XPS, ICP-AES, FT-IR, TGA, EXAFS, SEM and TEM. The silver-tungsten nanomaterial acts as an excellent catalyst for selective oxidation of aniline to Azoxybenzene using H2O2 as an oxidant. An aniline conversion of 87% with 91% selectivity of Azoxybenzene was achieved without the use of any external additives. Moreover, a high stability and recyclability of the catalyst is also observed under the investigated conditions.

  • catalytic oxidation of aniline to Azoxybenzene over cucr2o4 spinel nanoparticle catalyst
    ACS Sustainable Chemistry & Engineering, 2014
    Co-Authors: Shankha S Acharyya, Shilpi Ghosh, Rajaram Bal
    Abstract:

    Cationic surfactant cetyltrimethylammonium chloride-mediated hydrothermal preparation of CuCr2O4 spinel nanoparticles has been reported. This CuCr2O4 spinel nanoparticle catalyst has been characterized by XRD, XPS, SEM, TEM, TGA, and ICP-AES. Characterization results showed the formation of CuCr2O4 spinel nanoparticles with sizes between 25 and 50 nm. It was found that the catalyst can selectively convert aniline to Azoxybenzene with H2O2 as oxidant. The effect of different reaction parameters like reaction temperature, H2O2 to aniline molar ratio, reaction time, and so forth have been studied in detail. An aniline conversion of 78% with Azoxybenzene selectivity of 92% can be achieved over this catalyst at 70 °C. The catalyst did not show any leaching up to five reuses, showing the true heterogeneity of the catalyst. However, significant H2O2 decomposition occurs on the catalyst necessitating its usage in five-fold excess.

  • Catalytic Oxidation of Aniline to Azoxybenzene Over CuCr2O4 Spinel Nanoparticle Catalyst
    2014
    Co-Authors: Shankha S. Acharyya, Shilpi Ghosh, Rajaram Bal
    Abstract:

    Cationic surfactant cetyltrimethylammonium chloride-mediated hydrothermal preparation of CuCr2O4 spinel nanoparticles has been reported. This CuCr2O4 spinel nanoparticle catalyst has been characterized by XRD, XPS, SEM, TEM, TGA, and ICP-AES. Characterization results showed the formation of CuCr2O4 spinel nanoparticles with sizes between 25 and 50 nm. It was found that the catalyst can selectively convert aniline to Azoxybenzene with H2O2 as oxidant. The effect of different reaction parameters like reaction temperature, H2O2 to aniline molar ratio, reaction time, and so forth have been studied in detail. An aniline conversion of 78% with Azoxybenzene selectivity of 92% can be achieved over this catalyst at 70 °C. The catalyst did not show any leaching up to five reuses, showing the true heterogeneity of the catalyst. However, significant H2O2 decomposition occurs on the catalyst necessitating its usage in five-fold excess

Olivier Guillou - One of the best experts on this subject based on the ideXlab platform.

  • a new family of lanthanide based coordination polymers with Azoxybenzene 3 3 5 5 tetracarboxylic acid as ligand
    Inorganica Chimica Acta, 2019
    Co-Authors: Jinzeng Wang, Carole Daiguebonne, Yan Suffren, Thierry Roisnel, Stephane Freslon, Guillaume Calvez, Kevin Bernot, Olivier Guillou
    Abstract:

    Abstract Reactions by solvothermal methods of lanthanide nitrates and Azoxybenzene-3,3′,5,5′-tetracarboxylic acid (H4aobtc) lead to a family of isostructural lanthanide-based coordination polymers with general chemical formula [Ln(Haobtc)(H2O)2·2H2O]∞ with Ln = Nd − Er plus Y. The crystal structure has been solved on the basis of the Y3+-derivative. It crystallizes in the triclinic system, space group P-1 (n°2) with the following cell parameters: a = 6.6890(18) A, b = 10.052(3) A, c = 13.879(4) A,α = 75.756(9)°, β = 77.551(9)°, γ = 83.964(9)° and Z = 2. The crystal structure is two-dimensional (2D). Thermal properties and luminescent properties of the Nd3+-containing compound have been studied.

Jinzeng Wang - One of the best experts on this subject based on the ideXlab platform.

  • a new family of lanthanide based coordination polymers with Azoxybenzene 3 3 5 5 tetracarboxylic acid as ligand
    Inorganica Chimica Acta, 2019
    Co-Authors: Jinzeng Wang, Carole Daiguebonne, Yan Suffren, Thierry Roisnel, Stephane Freslon, Guillaume Calvez, Kevin Bernot, Olivier Guillou
    Abstract:

    Abstract Reactions by solvothermal methods of lanthanide nitrates and Azoxybenzene-3,3′,5,5′-tetracarboxylic acid (H4aobtc) lead to a family of isostructural lanthanide-based coordination polymers with general chemical formula [Ln(Haobtc)(H2O)2·2H2O]∞ with Ln = Nd − Er plus Y. The crystal structure has been solved on the basis of the Y3+-derivative. It crystallizes in the triclinic system, space group P-1 (n°2) with the following cell parameters: a = 6.6890(18) A, b = 10.052(3) A, c = 13.879(4) A,α = 75.756(9)°, β = 77.551(9)°, γ = 83.964(9)° and Z = 2. The crystal structure is two-dimensional (2D). Thermal properties and luminescent properties of the Nd3+-containing compound have been studied.

Takeo Konakahara - One of the best experts on this subject based on the ideXlab platform.