scholarly journals Effect of electric field in liquid phase oxidation of benzhydrol by aqueous hydrogen peroxide

2014 ◽  
Vol 7 (1) ◽  
Author(s):  
Amelia Boon Hoo ◽  
Hadi Nur
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Liquid Phase ◽  
Electric Field ◽  
Dye Adsorption ◽  
Organic Substrate ◽  
Conducting Surface ◽  
Aqueous Hydrogen Peroxide ◽  
Electrical Field ◽  
Phase Oxidation

Electric-field-induced oxidation of benzhydrol to benzophenone over conducting surface containing titanium dioxide has been carried out by usinghydrogen peroxide as oxidant. The results suggest the occurrence of synergistic effect of electric field and titania in which the interphase area between thetitania particles and conducting surface is the most active region for the reaction. The electrical field on the generation of surface charge to induce theadsorption of organic substrate has also been confirmed by dye adsorption experiments.

scholarly journals Metal-Organic Frameworks in Oxidation Catalysis with Hydrogen Peroxide

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 283
Author(s):  
Oxana Kholdeeva ◽  
Nataliya Maksimchuk
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Selective Oxidation ◽  
Metal Organic Frameworks ◽  
Short Review ◽  
Catalytic Performance ◽  
Oxidation Catalysis ◽  
Catalyst Stability ◽  
Aqueous Hydrogen Peroxide ◽  
Metal Organic

In recent years, metal–organic frameworks (MOFs) have received increasing attention as selective oxidation catalysts and supports for their construction. In this short review paper, we survey recent findings concerning use of MOFs in heterogeneous liquid-phase selective oxidation catalysis with the green oxidant–aqueous hydrogen peroxide. MOFs having outstanding thermal and chemical stability, such as Cr(III)-based MIL-101, Ti(IV)-based MIL-125, Zr(IV)-based UiO-66(67), Zn(II)-based ZIF-8, and some others, will be in the main focus of this work. The effects of the metal nature and MOF structure on catalytic activity and oxidation selectivity are analyzed and the mechanisms of hydrogen peroxide activation are discussed. In some cases, we also make an attempt to analyze relationships between liquid-phase adsorption properties of MOFs and peculiarities of their catalytic performance. Attempts of using MOFs as supports for construction of single-site catalysts through their modification with heterometals will be also addressed in relation to the use of such catalysts for activation of H2O2. Special attention is given to the critical issues of catalyst stability and reusability. The scope and limitations of MOF catalysts in H2O2-based selective oxidation are discussed.

Titanium Dioxide-Supported Sulfonated Low Rank Coal as Catalysts in the Oxidation of Styrene with Aqueous Hydrogen Peroxide

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
Mukhamad Nurhadi ◽  
Jon Efendi ◽  
Lee Siew Ling ◽  
Teuku Meurah Indra Mahlia ◽  
Ho Chin Siong ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Catalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Low Rank ◽  
Bet Surface Area ◽  
High Catalytic Activity ◽  
Low Rank Coal ◽  
X Ray Diffraction ◽  
Aqueous Hydrogen Peroxide

Titanium dioxide supported sulfonated low rank coal catalyst possesses high catalytic activity in liquid phase oxidation of styrene with aqueous hydrogen peroxide at room temperature. The catalysts were prepared by sulfonation with concentrated sulfuric acid and impregnation of titanium dioxide (500-2500 µmol). The effect of titanium dioxide impregnation and calcinations on the catalysts were studied by X-ray diffraction, UV-vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, BET surface area, field emission scanning electron microscopy and hydrophobicity measurement. The catalytic activity of the catalysts in the oxidation of styrene by aqueous H2O2 without calcination increased when the amount of titanium dioxide increased. Meanwhile, the catalytic activity of the catalyst calcined at 500oC for 2 h was lower than before calcination. It is suggested that the agglomeration of titanium dioxide and hydrophobicity play important role in the catalytic activity of titanium dioxide-supported sulfonated low rank coal in the oxidation of styrene with aqueous H2O2. 

Niobium peroxo compounds as catalysts for liquid-phase oxidation with hydrogen peroxide

2000 ◽  
Vol 153 (1-2) ◽  
pp. 103-108 ◽  
Author(s):  
Luis C. Passoni ◽  
M.Rafiq H. Siddiqui ◽  
Alexander Steiner ◽  
Ivan V. Kozhevnikov
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Liquid Phase Oxidation ◽  
Phase Oxidation

scholarly journals Liquid Phase Oxidation of Nitrous Acid by Hydrogen Peroxide.

1983 ◽  
Vol 37a ◽  
pp. 241-246 ◽  
Author(s):  
Hans T. Karlsson ◽  
Pekka Knuuttila ◽  
Steen Yde-Andersen ◽  
Eero Kemppinen ◽  
Ragnhild Seip ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Nitrous Acid ◽  
Liquid Phase Oxidation ◽  
Phase Oxidation

scholarly journals Keggin heteropolycompounds as catalysts for liquid-phase oxidation of sulfides to sulfoxides/sulfones by hydrogen peroxide

2011 ◽  
Vol 12 (8) ◽  
pp. 726-730 ◽  
Author(s):  
Gustavo P. Romanelli ◽  
Paula I. Villabrille ◽  
Cármen V. Cáceres ◽  
Patricia G. Vázquez ◽  
Pietro Tundo
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Liquid Phase Oxidation ◽  
Oxidation Of Sulfides ◽  
Phase Oxidation

Copper-doped alumina-pillared montmorillonites as catalysts for oxidation of toluene and xylenes with hydrogen peroxide

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 79-87 ◽  
Author(s):  
K. Bahranowski ◽  
M. Gąsior ◽  
A. Kielski ◽  
J. Podobiński ◽  
E. M. Serwicka ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Aromatic Ring ◽  
Catalytic Properties ◽  
Physicochemical Characterization ◽  
Methyl Groups ◽  
Significant Activity ◽  
Phase Oxidation ◽  
Pillared Montmorillonites

AbstractCatalytic properties of Cu-doped alumina-pillared montmorillonite samples have been tested in the liquid phase oxidation of toluene, o-, m-, and p-xylene with hydrogen peroxide. The results show that the clay samples possess significant activity for both the oxidation of methyl groups and hydroxylation of the aromatic ring. Physicochemical characterization of the catalysts using XRD, BET, ESR and ICP-AES techniques show that they are porous materials with Cu species located in the interlayer, present either as isolated Cu2+ ions anchored at alumina pillars or as patches of amorphous CuO. The dependence of the overall yields on the amount of Cu dopant is discussed and explained in terms of the catalyst structural properties.

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