Solvent-free selective oxidation of toluene over metal-doped MCM-22

2019 ◽  
Vol 43 (11) ◽  
pp. 4406-4412 ◽  
Author(s):  
Maaz Nawab ◽  
Sunita Barot ◽  
Rajib Bandyopadhyay
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Selective Oxidation ◽  
Physicochemical Characterization ◽  
Solvent Free ◽  
Reaction Parameters ◽  
Metal Doping ◽  
Metal Doped

The synthesis of MCM-22, subsequent metal doping, and physicochemical characterization of the products are reported. The solvent-free catalytic oxidation of toluene using hydrogen peroxide is explored, and the reaction parameters are optimized. A possible reaction mechanism is also described.

Physicochemical Characterization of Oxidatively Degraded Calcium Lignosulfonate via Alkaline Hydrogen Peroxide

2014 ◽  
Vol 887-888 ◽  
pp. 575-580 ◽  
Author(s):  
Li Hong Hu ◽  
Jing Zhou ◽  
Cai Ying Bo ◽  
Bing Chuan Liang ◽  
Yong Hong Zhou
Keyword(s):  
Hydrogen Peroxide ◽  
Phenolic Resin ◽  
Physicochemical Characterization ◽  
Oxidative Degradation ◽  
Alkaline Condition ◽  
Alkaline Hydrogen Peroxide ◽  
Phenolic Contents ◽  
H Nmr ◽  
Ft Ir

In order to increase the application prospect of calcium lignosulfonate in phenolic resin, Calcium lignosulfonate was oxidatively degraded by Hydrogen peroxide under alkaline condition. Both lignins were characterized by FT-IR, 1H NMR, UV, GC-MS and GPC. The optimal degradation conditions are: lignosulfonate:water=1:1, wt/wt, pH=10, temperature 60 °C, reaction time 2 h, and H2O2 dosage 6 wt% (based on weight of lignosulfonate). The results show that the degraded resultant is higher in phenolic contents, and lower in methoxyl content. Number molecular weight (Mn) of calcium lignosulfonate sharply decreases to 2294, versus 17774 before oxidative degradation.Guaiacly monoer content increased and kinds of phenolic compounds occurre in oxidative degradation fractions, mainly due to β-O-4 and β-5 cleavage. And reactive activity of the oxidatively degraded compounds is sharply increased.

An Efficient Solvent-Free Catalytic Oxidation of Sulfides to Sulfoxides with Hydrogen Peroxide Catalyzed by a Binaphthyl-Bridged Schiff Base Titanium Complex.

ChemInform ◽  
2007 ◽  
Vol 38 (1) ◽  
Author(s):  
Margherita De Rosa ◽  
Marina Lamberti ◽  
Claudio Pellecchia ◽  
Arrigo Scettri ◽  
Rosaria Villano ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Schiff Base ◽  
Catalytic Oxidation ◽  
Solvent Free ◽  
Titanium Complex ◽  
Oxidation Of Sulfides

The reaction mechanism of catalytic oxidation with hydrogen peroxide and ozone in aqueous solution

2003 ◽  
Vol 47 (1) ◽  
pp. 179-184 ◽  
Author(s):  
J.S. Park ◽  
H. Choi ◽  
K.H. Ahn
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Catalytic Oxidation ◽  
Catalytic Ozonation ◽  
Sorption Behavior ◽  
Model Compounds ◽  
Reaction Characteristics ◽  
Hydrophobic Portion ◽  
Bicarbonate Addition

The sorption and catalytic oxidation of model compounds (pCBA and phenanthrene) and NOM on FeOOH were investigated using hydrogen peroxide and ozone, respectively. After oxidation with ozone, the hydrophobic, transphilic, and hydrophilic NOM fractions were isolated using XAD-8 and -4 resins to analyze the reaction characteristics. The sorption of pCBA was strongly dependent upon the pH, but phenanthrene exhibited a sorption behavior that was independent of the pH. In the case of NOM, the hydrophobic portion showed higher sorption affinity than hydrophilic and transphilic at pH 7.2. The concentrations of model compounds and oxidants were measured during the oxidations and the efficiency was compared for tests done with ozone alone and those using catalytic ozonation. Through the comparison of the sorption and decomposition of the model compounds, along with the effects of bicarbonate addition, mechanisms for catalytic oxidation with hydrogen peroxide or ozone were proposed, respectively.

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.

An efficient solvent free catalytic oxidation of sulfides to sulfoxides with hydrogen peroxide catalyzed by a binaphthyl-bridged Schiff base titanium complex

2006 ◽  
Vol 47 (40) ◽  
pp. 7233-7235 ◽  
Author(s):  
Margherita De Rosa ◽  
Marina Lamberti ◽  
Claudio Pellecchia ◽  
Arrigo Scettri ◽  
Rosaria Villano ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Schiff Base ◽  
Catalytic Oxidation ◽  
Solvent Free ◽  
Titanium Complex ◽  
Oxidation Of Sulfides
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