Selectively Catalyzed Oxidation of Benzyl Alcohol by FeIII–TAML/Hydrogen Peroxide

2015 ◽  
Vol 723 ◽  
pp. 601-604 ◽  
Author(s):  
Ran Li ◽  
Ge Wang ◽  
Yan Chun Liu ◽  
Xiao Bin Chen ◽  
Zhi Min Sun ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Benzyl Alcohol ◽  
Reaction Temperature ◽  
Oxidation Reaction ◽  
Macrocyclic Ligands ◽  
Temperature Reaction ◽  
Oxidation Of Benzyl Alcohol ◽  
Catalyzed Oxidation

Benzyl alcohol was selectively oxidized to benzaldehyde with iron (III) complexed to tetra amido macrocyclic ligands (FeIII–TAML) as catalyst and 30% H2O2 as oxidant. The effect of reaction temperature, reaction time, solvent, amount of catalyst and oxidant on the reaction of catalyzed oxidation of benzyl alcohol were explored. The conversion and selectivity of this oxidation reaction were calculated from calibrated GC yields of benzyl alcohol and benzaldehyde. When oxidation reaction was conducted under the conditions: solvent NMMO: ethanol = 1: 1, n (H2O2): n (benzyl alcohol) = 2, n (catalyst): n (benzyl alcohol) = 1%, temperature 80 ̊C and reaction time 60 minutes, the conversion was 91.23% and the selectivity was 90.12%.

K5PW11NiO39-catalyzed oxidation of benzyl alcohol with hydrogen peroxide

2019 ◽  
Vol 4 (1) ◽  
pp. 302-310
Author(s):  
Nelson C. Coronel ◽  
Márcio J. da Silva ◽  
Sukarno O. Ferreira ◽  
Rene C. da Silva ◽  
Ricardo Natalino
Keyword(s):  
Hydrogen Peroxide ◽  
Benzyl Alcohol ◽  
Oxidation Of Benzyl Alcohol ◽  
Catalyzed Oxidation

scholarly journals Using High-Power UV-LED to Accelerate a Decatungstate-Anion-Catalyzed Reaction: A Model Study for the Quick Oxidation of Benzyl Alcohol to Benzoic Acid Using Molecular Oxygen

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1307
Author(s):  
Mamoru Hyodo ◽  
Hitomi Iwano ◽  
Takayoshi Kasakado ◽  
Takahide Fukuyama ◽  
Ilhyong Ryu
Keyword(s):  
Benzoic Acid ◽  
Benzyl Alcohol ◽  
Molecular Oxygen ◽  
High Power ◽  
Oxidation Reaction ◽  
Uv Led ◽  
Oxidation Of Benzyl Alcohol ◽  
Model Study ◽  
Catalyzed Oxidation ◽  
Led Irradiation

High-power UV-LED irradiation (365 nm) effectively accelerated the decatungstate-anion-catalyzed oxidation of benzyl alcohol 1 to benzoic acid 3 via benzaldehyde 2. As the power of the UV-LED light increased, both the selectivity and yield of benzoic acid also increased. The reaction was finished within 1 h to give 3 in a 93% yield using 2 mol% of decatungstate anion catalyst. The combination of a flow photoreactor and high-power irradiation accelerated the oxidation reaction to an interval of only a few minutes.

scholarly journals Catalytic Degradation of Chitosan by Supported Heteropoly Acids in Heterogeneous Systems

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1078
Author(s):  
Hang Zhang ◽  
Zhipeng Ma ◽  
Yunpeng Min ◽  
Huiru Wang ◽  
Ru Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Catalytic Activity ◽  
Activated Carbon ◽  
Reaction Time ◽  
High Molecular Weight ◽  
Reaction Temperature ◽  
Water Soluble ◽  
High Catalytic Activity ◽  
High Molecular Weight Chitosan

Several kinds of composite materials with phosphotungstic acid (PTA) as the catalyst were prepared with activated carbon as support, and their structures were characterized. According to the Box–Behnken central combination principle, the mathematical model of the heterogeneous system is established. Based on the single-factor experiments, the reaction temperature, the reaction time, the amount of hydrogen peroxide and the loading capacity of PTA were selected as the influencing factors to study the catalyzed oxidation of hydrogen peroxide and degradation of high molecular weight chitosan. The results of IR showed that the catalyst had a Keggin structure. The results of the mercury intrusion test showed that the pore structure of the supported PTA catalyst did not change significantly, and with the increase of PTA loading, the porosity and pore volume decreased regularly, which indicated that PTA molecules had been absorbed and filled into the pore of activated carbon. The results of Response Surface Design (RSD) showed that the optimum reaction conditions of supported PTA catalysts for oxidative degradation of high molecular weight chitosan by hydrogen peroxide were as follows: reaction temperature was 70 ℃, reaction time was 3.0 h, the ratio of hydrogen peroxide to chitosan was 2.4 and the catalyst loading was 30%. Under these conditions, the yield and molecular weight of water-soluble chitosan were 62.8% and 1290 Da, respectively. The supported PTA catalyst maintained high catalytic activity after three reuses, which indicated that the supported PTA catalyst had excellent catalytic activity and stable performance compared with the PTA catalyst.

Study on Synthesis of the High Aspect Ratios Nesquehonite Whiskers

2011 ◽  
Vol 239-242 ◽  
pp. 1118-1122 ◽  
Author(s):  
Ping Ke Yan ◽  
Bin Wang ◽  
Yu Juan Gao
Keyword(s):  
Aqueous Solution ◽  
Reaction Time ◽  
Low Temperature ◽  
Growth Mechanism ◽  
Reaction Temperature ◽  
Solution Method ◽  
Temperature Reaction ◽  
Aspect Ratios ◽  
Whisker Length ◽  
Aqueous Solution Method

In this paper, nesquehonite whiskers were synthesized by low-temperature aqueous solution method, and the impacts of reaction temperature, reaction time and surfactant dosage and other factors on the maximum whisker length and high aspect ratios of nesquehonite whiskers were also investigated. Results showed that under the conditions that the reaction temperature was 40 – 50 °C the reaction time was 50 – 60min and the amount of surfactant dosage was 1% (by mass), high aspect ratios nesquehonite whisker products can be synthesized. On this basis, growth mechanism of the nesquehonite whiskers was discussed.

scholarly journals Continuous Heterogeneously Catalyzed Oxidation of Benzyl Alcohol Using a Tube-in-Tube Membrane Microreactor

2015 ◽  
Vol 54 (16) ◽  
pp. 4183-4189 ◽  
Author(s):  
Gaowei Wu ◽  
Achilleas Constantinou ◽  
Enhong Cao ◽  
Simon Kuhn ◽  
Moataz Morad ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Oxidation Of Benzyl Alcohol ◽  
Catalyzed Oxidation

Highly selective oxidation of benzyl alcohol to benzaldehyde with hydrogen peroxide by biphasic catalysis

2010 ◽  
Vol 162 (2) ◽  
pp. 738-742 ◽  
Author(s):  
Yuanyuan Yu ◽  
Bin Lu ◽  
Xiaoguang Wang ◽  
Jingxiang Zhao ◽  
Xuanzhang Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Benzyl Alcohol ◽  
Selective Oxidation ◽  
Biphasic Catalysis ◽  
Oxidation Of Benzyl Alcohol

scholarly journals Influence of low-temperature reaction time on morphology and phase composition of short calcium phosphate whiskers

2019 ◽  
Vol 13 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Monika Biernat ◽  
Zbigniew Jaegermann ◽  
Paulina Tymowicz-Grzyb ◽  
Gustaw Konopka
Keyword(s):  
Hydrogen Peroxide ◽  
Phase Composition ◽  
Reaction Time ◽  
Calcium Phosphate ◽  
Biphasic Calcium Phosphate ◽  
Calcium Pyrophosphate ◽  
Temperature Reaction ◽  
Test Results ◽  
Lower Temperature ◽  
Hydrothermal Methods

The present work shows the results of the synthesis of multiphasic calcium phosphate whiskers from a mixture of biphasic calcium phosphate (?-tricalcium phosphate (?-TCP) and calcium pyrophosphate (CPP)) in the hydrogen peroxide solution-mediated process carried out in different time ranges. The process was performed at considerably lower temperature than typical hydrothermal methods used for obtaining of whiskers. Test results show that using the above-mentioned procedure triphasic calcium phosphate consisting of hydroxyapatite (HA),(?-TCP) and CPP can be obtained, where the whiskers are formed mainly from hydroxyapatite. It was found that morphology, phase composition and specific surface area of the reaction product can be controlled by changing the reaction time. The obtained triphasic HA/?-TCP/CPP short whiskers may be considered as a promising biocompatible and resorbable reinforcement in composites for bone tissue engineering with a faster resorption rate than that of HA.

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