Formation of Cu-supported mesoporous silicates and aluminosilicates and liquid-phase oxidation of benzene catalyzed by the Cu-mesoporous silicates and aluminosilicates

Okamura, Junji; Nishiyama, Satoru; Tsuruya, Shigeru; Masai, Mitsuo

doi:10.1016/s1381-1169(97)00298-7

Cited by 92 publications

(42 citation statements)

References 22 publications

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“…In several other studies, iron was replaced by other redox metals. Thus, studies have been performed in the presence of Cu-supported zeolites, [22] Cu-supported MCM-41 catalysts, [23] and CuOAl 2 O 3 [24] but yields obtained were still lower than 1%. Higher yields of phenol are also reported when iron is replaced by vanadium catalysts.…”

Section: Direct Hydroxylation Of Aromatic Compoundsmentioning

confidence: 99%

Oxidation and Ammoxidation of Aromatics

Lücke¹,

Narayana²,

Martin³

et al. 2004

Adv Synth Catal

131

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An overview of the state of the art in the direct oxygen or nitrogen insertion to aromatic rings and side-chains by hydroxylation, acetoxylation, partial oxidation and ammoxidation is presented. The influence of a variety of catalysts and oxidants on the yields of hydroxylated products of aromatic species is discussed in more detail. The survey is also focussed on the usage of H 2 O 2 as an effective oxidising agent for hydroxylation reactions. Acetoxylation of methyl-substituted aromatic compounds to their corresponding esters in a single step is indeed an interesting area from an industrial point of view. Hence, the topics covering benzylic acetoxylation, although they are under a developmental stage for commercial exploitation, are also reviewed. The present contribution also covers the main directions of selective oxidation/ammoxidation of aromatic compounds to useful products, surveys recent developments and provides an updated discussion of the state of the art in the field of oxidation and ammoxidation of aromatics. Additionally, a comparative study of the vapour phase oxidation and ammoxidation of different alkyl aromatics to their corresponding aldehydes and nitriles using various heterogeneous catalysts is presented.Besides, the achievements and limitations of the catalysts/processes are emphasised. Furthermore, the present article includes a discussion of common features and differences in mechanistic steps of oxidation and ammoxidation reactions investigated by in situ FITR spectroscopy. The influence of acid-base properties of catalyst surfaces in connection with electronic effects of the substituents on the performance of the catalysts is also described.

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Section: Direct Hydroxylation Of Aromatic Compoundsmentioning

confidence: 99%

Oxidation and Ammoxidation of Aromatics

Lücke¹,

Narayana²,

Martin³

et al. 2004

Adv Synth Catal

131

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“…4 Copper complexes have been studied for the hydroxylation of benzene and the oxidation of phenol to 1,4-quinone. 2 Okamura et al 5 have reported the liquid phase oxidation of benzene to phenol, with molecular oxygen and Cu-MCM as the catalyst. However, phenol yields are low, a large amount of supported Cu is required, and ascorbic acid is used as a stoichiometric coreductant.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and benzene oxidation promoted by a new mononuclear copper(II) complex, [Cu(BTMEA)2Cl]Cl

Esmelindro

Oestreicher

Caovilla

et al. 2006

J. Braz. Chem. Soc.

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O objetivo deste trabalho é apresentar a síntese, estrutura cristalina, atividade eletroquímica, propriedades espectroscópicas (IV-TF e UV-Vis) e atividade catalítica frente à oxidação do benzeno do novo complexo mononuclear de cobre ( I redox couple and with a coupled reaction involving the chloride ligand. The catalytic activity of 1 was evaluated through benzene oxidation reaction, using hydrogen peroxide as oxidant. Reaction products (phenol and pbenzoquinone) were identified by gas chromatography.

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“…The incorporation of copper into MCM-41 has been investigated and the catalytic activity of the resulting material studied. It was found that Cu-MCM-41 can be used as a catalyst for various homogeneous oxidation reactions such as the oxidation of phenol, [12,13] benzene, [14] trimethylphenol, [15] and alcohols, [16] and it is also active for NO decomposition and NO reduction by CO. [17,18] However, all the Cu-MCM-41 materials reported in the literature were prepared by i) impregnation, ii) ion-exchange, or iii) hydrothermal methods, and the reported copper content was lower than 5 wt.-%, which limits the application of the materials. We have prepared a series of copper-containing MCM-41s, with a copper content ranging from 5 to 30 wt.-%, in the presence of cetyltrimethylammonium bromide (CTABr) using a sol±gel method at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Structure of MCM‐41 Samples with a High Copper Content

Kong

Zhu

Yang

et al. 2004

Adv Funct Materials

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A series of MCM‐41s with a high copper content were synthesized at room temperature from sodium metasilicate (Na2SiO3) as the silicon source, tetraamminecopper(II) nitrate [Cu(NH3)4(NO3)2] as the copper source and cetyltrimethylammonium bromide (CTABr) as the template. The resulting material was characterized by using the following characterization techniques: X‐ray diffraction (XRD), N2‐adsorption isotherms, high‐resolution transmission electron microscopy (HRTEM), inductively coupled plasma (ICP), temperature‐programmed reduction (H2‐TPR), X‐ray photoelectron spectroscopy (XPS), Fourier‐transform infrared spectroscopy (FTIR), UV‐vis spectroscopy, electron‐spin resonance (ESR) and 29Si magic‐angle sample spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The characterization techniques demonstrated the following: i) the copper atoms are incorporated into the framework of MCM‐41 and ii) the copper species in the samples are in a distorted octahedral coordination environment, with between four and six oxygen atoms in the first coordination sphere. The maximum copper content determined by ICP was 26 wt.‐% in the ordered mesoporous sample with a surface area of 525 m2 g–1 and an average pore diameter of 3.1 nm. The synthesized materials exhibited a high activity for nitrogen monoxide (NO) reduction by carbon monoxide (CO).

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Formation of Cu-supported mesoporous silicates and aluminosilicates and liquid-phase oxidation of benzene catalyzed by the Cu-mesoporous silicates and aluminosilicates

Cited by 92 publications

References 22 publications

Oxidation and Ammoxidation of Aromatics

Oxidation and Ammoxidation of Aromatics

Synthesis, characterization and benzene oxidation promoted by a new mononuclear copper(II) complex, [Cu(BTMEA)2Cl]Cl

Investigation of the Structure of MCM‐41 Samples with a High Copper Content

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