scholarly journals Oxidative cleavage of cycloalkenes using hydrogen peroxide and a tungsten-based catalyst: towards a complete mechanistic investigation

2021 ◽  
Vol 45 (1) ◽  
pp. 235-242
Author(s):  
Tony Cousin ◽  
Gregory Chatel ◽  
Bruno Andrioletti ◽  
Micheline Draye
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Oxidative Cleavage ◽  
Mechanistic Investigation ◽  
By Products

The identification of intermediates and by-products issuing from the oxidative cleavage of cycloolefins allows proposing of a reaction mechanism.

scholarly journals Transformation of Contaminants of Emerging Concern (CECs) during UV-Catalyzed Processes Assisted by Chlorine

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1432
Author(s):  
Edyta Kudlek
Keyword(s):  
Hydrogen Peroxide ◽  
Water Samples ◽  
Water Environment ◽  
Toxicity Assessment ◽  
Contaminants Of Emerging Concern ◽  
Post Processing ◽  
Processing Water ◽  
Living Organisms ◽  
Trace Concentrations ◽  
By Products

Every compound that potentially can be harmful to the environment is called a Contaminant of Emerging Concern (CEC). Compounds classified as CECs may undergo different transformations, especially in the water environment. The intermediates formed in this way are considered to be toxic against living organisms even in trace concentrations. We attempted to identify the intermediates formed during single chlorination and UV-catalyzed processes supported by the action of chlorine and hydrogen peroxide or ozone of selected contaminants of emerging concern. The analysis of post-processing water samples containing benzocaine indicated the formation of seven compound intermediates, while ibuprofen, acridine and β-estradiol samples contained 5, 5, and 3 compound decomposition by-products, respectively. The number and also the concentration of the intermediates decreased with the time of UV irradiation. The toxicity assessment indicated that the UV-catalyzed processes lead to decreased toxicity nature of post-processed water solutions.

Kinetics Studies for Catalytic Oxidation of Methyl Orange over the Heterogeneous Fe/Beta Catalysts

2013 ◽  
Vol 807-809 ◽  
pp. 361-364
Author(s):  
Fang Guo ◽  
Jun Qiang Xu ◽  
Jun Li
Keyword(s):  
Activation Energy ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Methyl Orange ◽  
Incipient Wetness Impregnation ◽  
Kinetics Studies ◽  
Optimum Reaction ◽  
Catalyst Dosage ◽  
Oxidation Degradation ◽  
Degradation Of Methyl Orange

The Fe/Beta catalysts were prepared by conventional incipient wetness impregnation. The catalysis oxidation degradation of methyl orange was carried out in catalyst and H2O2 process. The results indicated that the catalyst and hydrogen peroxide were more benefit to degradation of methyl orange. The reaction condition was optimized. The optimum reaction process was as follow: iron amount of catalyst was 1.25%, the catalyst dosage and H2O2 concentration was 1 mg/L and 1.5 mg/L, and reaction temperature was 70 °C. The apparent activation energy (65 KJ/mol) was obtained according to the arrhenius formula, which was benefit to study the reaction mechanism.

scholarly journals Reaction Mechanism of Aqueous Benzene with Hydrogen Peroxide by Transient Absorbance Spectra

2004 ◽  
Vol 20 (09) ◽  
pp. 1112-1117 ◽  
Author(s):  
Zhu Cheng-Zhu ◽  
◽  
Zhang Ren-Xi ◽  
Zheng Guang-Ming ◽  
Ouyang Bin ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Transient Absorbance ◽  
Absorbance Spectra

scholarly journals L-TARTARIC ACID: PRODUCTION TECHNOLOGY, ECONOMIC GROWTH AND QUALITY CONTROL

2018 ◽  
Vol 15 (30) ◽  
pp. 12-18
Author(s):  
G. D. LEIROSE ◽  
M-F GRENIER-LOUS TALOT ◽  
A. H. OLIVEIRA
Keyword(s):  
Economic Growth ◽  
Hydrogen Peroxide ◽  
Quality Control ◽  
Quality Assurance ◽  
Tartaric Acid ◽  
Molecular Formula ◽  
Natural Substances ◽  
By Products ◽  
Final Consumer

Natural substances are the basis of many types of industries and represent a growing market. The study of these products and the development of analytical methods should accompany this growth to ensure quality and provenance to consumers. An example to be discussed is the L(+)-Tartaric acid, an organic compound of molecular formula C4H6O6. This organic acid is widely applied in wine, food and pharmaceutical industry. It is obtained naturally through the fermentation of fruits, especially grape and tamarind. Synthetically, there are two ways of obtaining L(+)-tartaric acid on industrial scale. It can be synthesized by the reaction of maleic anhydride with hydrogen peroxide, which is derived from petroleum by-products. And by biotechnological synthesis, in which cis-epoxy succinic acid, also derived from petroleum, is converted into L(+)-tartaric acid by hydrolase enzyme. The market for tartaric acid is growing and is considered promising. Currently, there is a lack of legislation and specific rules that allow classification of tartaric acid according to its origin. This legal vacuum precludes quality assurance for the consumer. This lack of safety is a matter of great concern as applications of tartaric acid come directly to final consumer.

Reaction mechanism of 1,2-hydrogen migration of hydrogen peroxide

1990 ◽  
Vol 68 (5) ◽  
pp. 666-673 ◽  
Author(s):  
Enric Bosch ◽  
José M. Lluch ◽  
Juan Bertrán
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Water Molecule ◽  
Energy Barrier ◽  
Electron Distribution ◽  
Reaction Path ◽  
Bifunctional Catalyst ◽  
Reaction Coordinate ◽  
Intrinsic Reaction Coordinate ◽  
Hydrogen Migration

The 1,2-hydrogen migration of hydrogen peroxide has been investigated by abinitio methods and the Intrinsic Reaction Coordinate (IRC) has been constructed. An analysis of the evolution of the electron distribution along the reaction path has shown that the shifting hydrogen behaves as a proton. This transferring proton polarizes the O—O bond of the hydrogen peroxide that becomes broken at the transition state. If a water molecule is allowed to participate in the reaction, the energy barrier is noticeably lowered, this water molecule acting as a bifunctional catalyst. Keywords: 1,2-hydrogen migration, hydrogen peroxide, proton transfer, bifunctional catalyst, Intrinsic Reaction Coordinate.

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