Copper/MCM-41 as catalyst for photochemically enhanced oxidation of phenol by hydrogen peroxide

2001 ◽  
Vol 68 (1-3) ◽  
pp. 129-133 ◽  
Author(s):  
Xijun Hu ◽  
Frank L.Y. Lam ◽  
Lok M. Cheung ◽  
Ka F. Chan ◽  
Xiu S. Zhao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidation Of Phenol ◽  
Enhanced Oxidation ◽  
Mcm 41

Hydroxylation of Phenol over Ti-MCM-41 and TS-1

1995 ◽  
Vol 60 (3) ◽  
pp. 451-456 ◽  
Author(s):  
Kornelia Kulawik ◽  
Günter Schulz-Ekloff ◽  
Jiří Rathouský ◽  
Arnošt Zukal ◽  
Jiří Had
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Rate ◽  
Hydroxylation Of Phenol ◽  
Oxidation Of Phenol ◽  
Mcm 41

In the oxidation of phenol by hydrogen peroxide over titanium containing MCM-41 materials, practically only para isomers are formed. The exclusive para selectivity is proposed to be due to the different strength of adsorption for the para and ortho isomers influencing the overall reaction rate or the faster polymerization of the ortho product. The former mechanism is more probable.

Preparation of Immobilized Chromium Schiff Base Complexes and their Catalytic Performance for Olefins Epoxidation

2014 ◽  
Vol 692 ◽  
pp. 240-244
Author(s):  
Gong De Wu ◽  
Xiao Li Wang ◽  
Zhi Li Zhai
Keyword(s):  
Hydrogen Peroxide ◽  
Schiff Base ◽  
Elemental Analysis ◽  
Catalytic Performance ◽  
Schiff Base Complexes ◽  
Metal Centers ◽  
Chemical Measurements ◽  
Physico Chemical ◽  
Immobilized Complexes ◽  
Mcm 41

A series of transition metal alanine-salicylaldehyde Schiff base chromium (III) complexes immobilized on MCM-41 were prepared and characterized by various physico-chemical measurements such as FIIR, XRD, HRTEM, N2 sorption and elemental analysis. The immobilized complexes were effective and stable catalysts for the epoxidation of styrene and cyclohexene with 30% hydrogen peroxide. Moreover, the metal centers were found to play important roles in the catalytic performance of immobilized complex catalysts.

scholarly journals Oxidative desulfurization of dibenzothiophene catalyzed by peroxotungstate on functionalized MCM-41 materials using hydrogen peroxide as oxidant

2015 ◽  
Vol 36 (8) ◽  
pp. 1205-1213 ◽  
Author(s):  
Dong Xie ◽  
Qihui He ◽  
Yangyang Su ◽  
Tongwei Wang ◽  
Renfu Xu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Desulfurization ◽  
Mcm 41

Homogeneous oxidation of phenols in aqueous solution with hydrogen peroxide and ferric ions

1997 ◽  
Vol 36 (2-3) ◽  
pp. 151-154 ◽  
Author(s):  
H. Grigoropoulou ◽  
C. Philippopoulos
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulphate ◽  
Ph Control ◽  
Chemical Oxidation ◽  
Ferric Ions ◽  
Experimental Conditions ◽  
Oxidation Rates ◽  
Homogeneous Oxidation ◽  
Oxidation Of Phenol ◽  
Ferrous Ammonium

The chemical oxidation of phenol and chlorophenols with hydrogen peroxide in the presence of soluble iron can be economically attractive at low oxidant consumption, leading then to intermediates that are more easily biodegradable. The homogeneous oxidation of phenol and chlorophenols in aqueous solutions with hydrogen peroxide is studied at oxidant : phenol ratio of about 4:1 and 16:1 (mol/mol) at various catalyst concentrations, at ambient temperature without pH control. Ferric chloride, ferric and ferrous sulphate and ferrous ammonium sulphate are used as oxidation catalysts. Ferric salts induce higher oxidation rates than ferrous ones and the nature of the anions present does not affect reaction rate. 4-Chlorophenol is found to be most resistant to oxidation and 2,4,6-Trichlorophenol is not attacked by hydrogen peroxide in the presence of ferric ions at the experimental conditions studied.

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