Epoxidation of Allyl Alcohol to Glycidol over Titanium-Silicalite Ti-Beta and Ti-MCM-41 Catalysts

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Agnieszka Wróblewska ◽  
Anna Fajdek ◽  
Joanna Wajzberg ◽  
Eugeniusz Milchert
Keyword(s):  
Hydrogen Peroxide ◽  
Atmospheric Pressure ◽  
Allyl Alcohol ◽  
Titanium Silicalite ◽  
Mcm 41

AbstractEpoxidation of allyl alcohol with 30% hydrogen peroxide over Ti-Beta and Ti-MCM-41 catalysts has been studied under atmospheric pressure in the presence of methanol as a solvent. The influence of the following parameters: temperature (20-60˚C), AA/H

Catalytic olefin epoxidation over cobalt(ii)-containing mesoporous silica by molecular oxygen in dimethylformamide medium

2014 ◽  
Vol 4 (6) ◽  
pp. 1820-1828 ◽  
Author(s):  
Susmita Bhunia ◽  
Sreyashi Jana ◽  
Debraj Saha ◽  
Buddhadeb Dutta ◽  
Subratanath Koner
Keyword(s):  
Schiff Base ◽  
Mesoporous Silica ◽  
Molecular Oxygen ◽  
Atmospheric Pressure ◽  
Allyl Alcohol ◽  
Schiff Base Complex ◽  
Olefin Epoxidation ◽  
Base Complex ◽  
Mcm 41

A cobalt(ii) Schiff base complex has been anchored onto the surface of Si–MCM-41 to prepare a new catalyst. The catalyst is capable of catalyzing epoxidation reactions of olefinic compounds, including styrene and allyl alcohol, with molecular oxygen at atmospheric pressure in DMF medium.

Liquid Phase Epoxidation of Allylic Compounds with Hydrogen Peroxide at Autogenic and Atmospheric Pressure over Mesoporous Ti- MCM-48 Catalyst

2009 ◽  
Vol 12 (2) ◽  
Author(s):  
Agnieszka Wróblewska ◽  
Eugeniusz Milchert
Keyword(s):  
Hydrogen Peroxide ◽  
Liquid Phase ◽  
Atmospheric Pressure ◽  
Allyl Alcohol ◽  
Molar Ratio ◽  
Technological Parameters ◽  
Liquid Phase Epoxidation

AbstractThe epoxidation of allylic compounds: allyl alcohol, methallyl alcohol and methallyl chloride to corresponding epoxides: glycidol, 2-methylglycidol and 2-methylepichlorohydrin with hydrogen peroxide over Ti-MCM-48 catalyst has been studied. The epoxidation was carried out with 30 wt% hydrogen peroxide in methanol as a solvent under autogenic pressure (in autoclave) and at atmospheric pressure in a glass reactor. The optimal technological parameters and regions of advantageous changes of: temperature, the molar ratio allylic compound/H

scholarly journals The new method of 1,2-epoxy-3-butanol production over titanium silicalite catalysts

2007 ◽  
Vol 9 (2) ◽  
pp. 49-52
Author(s):  
Joanna Wajzberg ◽  
Agnieszka Wróblewska
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compounds ◽  
Main Product ◽  
Chemical Compounds ◽  
New Method ◽  
Titanium Silicalite ◽  
Butanol Production ◽  
Optimal Parameters ◽  
The Individual ◽  
Mcm 41

The new method of 1,2-epoxy-3-butanol production over titanium silicalite catalysts The results of 1-butene-3-ol (1B3O) epoxidation over the titanium silicalite catalysts: TS-1, Ti-Beta, Ti-MCM-41 has been presented. The optimal parameters obtained for the individual catalyst were compared. The main functions describing the process were: the selectivity of transformation to 1,2-epoxy-3-butanol (1,2E3B) in relation to 1B3O consumed, the conversions of 1B3O and hydrogen peroxide and the selectivity of the transformation to organic compounds in relation to the H2O2 consumed. The main product of the epoxidation process was 1,2-epoksy-3-butanol, the chemical compounds having a lot of applications.

scholarly journals The oxidation of limonene at raised pressure and over the various titanium-silicate catalysts

2015 ◽  
Vol 17 (4) ◽  
pp. 82-87 ◽  
Author(s):  
Agnieszka Wróblewska ◽  
Edyta Makuch ◽  
Piotr Miądlicki
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Atmospheric Pressure ◽  
Perillyl Alcohol ◽  
Molar Ratio ◽  
Titanium Silicate ◽  
Butyl Hydroperoxide ◽  
Tert Butyl Hydroperoxide ◽  
Catalyst Content ◽  
Mcm 41

Abstract This work presents the studies on the oxidation of limonene with hydrogen peroxide and tert-butyl hydroperoxide (TBHP) in the presence of : TS-2, Ti-Beta, Ti-MCM-41 and Ti-MWW catalysts, at the autogenic pressure and atmospheric pressure. The examination were performed at the following conditions: the temperature of 140°C (studies in the autoclave) and 80°C (studies in glass reactor), the molar ratio of limonene/oxidant (H2O2 or WNTB) = 1:1, the methanol concentration 80 wt%, the catalyst content 3 wt%, the reaction time 3 h and the intensity of stirring 500 rpm. The analysis of the results showed that in process not only 1,2-epoxylimonene was formed but also: 1,2-epoxylimonene diol, carveol, carvone and perillyl alcohol but for 1,2-epoxylimonene obtaining the better method was the method at the autogenic pressure and in the presence of TBHP.

Enhanced Long-Term Color Stability of Teeth Treated with Hydrogen Peroxide and Non-Thermal Atmospheric Pressure Plasma Jets

2014 ◽  
Vol 11 (11) ◽  
pp. 1010-1017 ◽  
Author(s):  
Seoul Hee Nam ◽  
Hyun Wook Lee ◽  
Jin Woo Hong ◽  
Hae June Lee ◽  
Gyoo Cheon Kim
Keyword(s):  
Hydrogen Peroxide ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Color Stability ◽  
Plasma Jets ◽  
Pressure Plasma

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 The utilization of the mesoporous Ti-SBA-15 catalyst in the epoxidation of allyl alcohol to glycidol and diglycidyl ether in the water medium

2015 ◽  
Vol 17 (4) ◽  
pp. 23-31 ◽  
Author(s):  
Agnieszka Wróblewska ◽  
Edyta Makuch ◽  
Małgorzata Dzięcioł ◽  
Roman Jędrzejewski ◽  
Paweł Kochmański ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Allyl Alcohol ◽  
Water Solution ◽  
Reaction Medium ◽  
Diglycidyl Ether ◽  
Molar Ratio ◽  
Water Medium ◽  
Catalyst Content ◽  
Allyl Alcohol Epoxidation

Abstract This work presents the studies on the optimization the process of allyl alcohol epoxidation over the Ti-SBA-15 catalyst. The optimization was carried out in an aqueous medium, wherein water was introduced into the reaction medium with an oxidizing agent (30 wt% aqueous solution of hydrogen peroxide) and it was formed in the reaction medium during the processes. The main investigated technological parameters were: the temperature, the molar ratio of allyl alcohol/hydrogen peroxide, the catalyst content and the reaction time. The main functions the process were: the selectivity of transformation to glycidol in relation to allyl alcohol consumed, the selectivity of transformation to diglycidyl ether in relation to allyl alcohol consumed, the conversion of allyl alcohol and the selectivity of transformation to organic compounds in relation to hydrogen peroxide consumed. The analysis of the layer drawings showed that in water solution it is best to conduct allyl alcohol epoxidation in direction of glycidol (selectivity of glycidol 54 mol%) at: the temperature of 10–17°C, the molar ratio of reactants 0.5–1.9, the catalyst content 2.9–4.0 wt%, the reaction time 2.7–3.0 h and in direction of diglycidyl ether (selectivity of diglycidyl ether 16 mol%) at: the temperature of 18–33°C, the molar ratio of reactants 0.9–1.65, the catalyst content 2.0–3.4 wt%, the reaction time 1.7–2.6 h. The presented method allows to obtain two very valuable intermediates for the organic industry.

Synthesis of phosphomolybdic acid/nanocrystalline titanium silicalite-1 catalyst in the presence of hydrogen peroxide for effective adsorption-oxidative desulfurization

2022 ◽  
Author(s):  
Siyue Wang ◽  
Tong Huan ◽  
Haonan Li ◽  
Xin Shi ◽  
Di Liu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxidative Desulfurization ◽  
Phosphomolybdic Acid ◽  
Impregnation Method ◽  
Titanium Silicalite ◽  
Nanocrystalline Titanium

The phosphomolybdic acid (HPMo) supported on microporous nanocrystalline titanium silicalite-1 zeolite (Nano-TS-1) catalysts were prepared in the absence or presence of hydrogen peroxide via the impregnation method. The catalysts were...

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