scholarly journals Kinetic Studies of the Oxidation Reactions ofo-,m-, andp-Benzenediols with Tris(1,10-phenanthroline)iron(III). An Estimation of the Redox Potentials of the Organic Radicals by Application of the Marcus Theory

1981 ◽  
Vol 54 (6) ◽  
pp. 1699-1703 ◽  
Author(s):  
Masaru Kimura ◽  
Shinichi Yamabe ◽  
Tsutomu Minato
Keyword(s):  
Kinetic Studies ◽  
Marcus Theory ◽  
Organic Radicals ◽  
Redox Potentials ◽  
Oxidation Reactions

scholarly journals New Insights into the Electrocatalytic Mechanism of Methanol Oxidation on Amorphous Ni-B-Co Nanoparticles in Alkaline Media

Catalysts ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 749 ◽  
Author(s):  
Wu ◽  
Zhang ◽  
Zhang ◽  
Duan ◽  
Li ◽  
...  
Keyword(s):  
Methanol Oxidation ◽  
Amorphous Materials ◽  
Reaction Order ◽  
Chemical Reduction ◽  
Three Dimensional ◽  
Kinetic Studies ◽  
Alkaline Media ◽  
Methanol Oxidation Reaction ◽  
Oxidation Reactions ◽  
Co Nanoparticles

Despite an increased interest in sustainable energy conversion systems, there have been limited studies investigating the electrocatalytic reaction mechanism of methanol oxidation on Ni-based amorphous materials in alkaline media. A thorough understanding of such mechanisms would aid in the development of amorphous catalytic materials for methanol oxidation reactions. In the present work, amorphous Ni-B and Ni-B-Co nanoparticles were prepared by a simple chemical reduction, and their electrocatalytic properties were investigated by cyclic voltammetry measurements. The diffusion coefficients (D0) for Ni-B, Ni-B-Co0.02, Ni-B-Co0.05, and Ni-B-Co0.1 nanoparticles were calculated to be 1.28 × 10−9, 2.35 × 10−9, 4.48 × 10−9 and 2.67 × 10−9 cm2 s−1, respectively. The reaction order of methanol in the studied transformation was approximately 0.5 for all studied catalysts, whereas the reaction order of the hydroxide ion was nearly 1. The activation energy (Ea) values of the reaction were also calculated for the Ni-B and Ni-B-Co nanoparticle systems. Based on our kinetic studies, a mechanism for the methanol oxidation reaction was proposed which involved formation of an electrocatalytic layer on the surface of amorphous Ni–B and Ni-B-Co nanoparticles. And methanol and hydroxide ions could diffuse freely through this three-dimensional porous conductive layer.

Kinetic Studies in the Chemistry of Rubber and Related Materials. III. Thermochemistry and Mechanisms of Olefin Oxidation

1947 ◽  
Vol 20 (3) ◽  
pp. 617-626
Author(s):  
J. L. Bolland ◽  
Geoffrey Gee
Keyword(s):  
Kinetic Studies ◽  
Ethyl Linoleate ◽  
Oxidation Products ◽  
Oxidation Reactions ◽  
Olefin Oxidation ◽  
Primary Products ◽  
Resonance Energies ◽  
Oxidation Chain ◽  
Bond Strengths

Abstract A new estimate of the O—O bond strength in hydroperoxides is reported, based on a determination of the heats of oxidation of ethyl linoleate and linolenate. This value is employed, together with other known bond strengths and resonance energies, to estimate the heats of a number of alternative oxidation reactions of olefins. By considering the effects of the olefin structure on these heats of reaction, it is possible to see how structural differences can lead to the formation of different oxidation products. The discussion is confined to primary products of the oxidation chain, but, even so, a considerable diversity of behavior is shown to be possible. The final material may include simple monomeric hydroperoxides, polymers with varying amounts of oxygen incorporated in the chain, cyclic peroxides, and scission products. The very limited experimental evidence available falls generally into line with expectation.

Kinetic Studies of Acetate Exchange intrans-4-Acetoxy-[η3-(1,2,3)-cyclohexenyl]palladium Complexes. Relevance for Asymmetric 1,4-Oxidation Reactions

2002 ◽  
Vol 21 (16) ◽  
pp. 3367-3375 ◽  
Author(s):  
Hanna K. Cotton ◽  
Renzo C. Verboom ◽  
Lars Johansson ◽  
Bernd J. Plietker ◽  
Jan-E. Bäckvall
Keyword(s):  
Kinetic Studies ◽  
Palladium Complexes ◽  
Oxidation Reactions

Synthesis of amino-phenolate manganese complexes and their catalytic activity in carbon dioxide activation and oxidation reactions

2020 ◽  
pp. 1-7
Author(s):  
Ali I. Elkurtehi ◽  
Francesca M. Kerton
Keyword(s):  
Carbon Dioxide ◽  
Variable Temperature ◽  
Styrene Oxide ◽  
Aerobic Oxidation ◽  
Kinetic Studies ◽  
Cyclic Carbonate ◽  
Oxidation Reactions ◽  
Co Catalyst ◽  
Carbonate Formation ◽  
Solvent Free Conditions

Two manganese(III) compounds were studied as catalysts for the reaction of carbon dioxide with propylene oxide, styrene oxide, and cyclohexene oxide, and formed cyclic carbonate products selectively under solvent free conditions in the presence of an ionic co-catalyst such as TBAB or PPNCl. Variable temperature kinetic studies allowed the activation energy for propylene carbonate formation to be determined (64 kJ mol−1). The catalysts showed good stability in these reactions and overall turnover numbers (TON) of up to 6000 were observed. The complexes showed low activity for the aerobic oxidation of 4-methyoxybenzylalcohol to the corresponding aldehyde, achieving up to 40% conversion in 72 h. However, near quantitative conversion of 1,2-diphenyl-2-methoxyethanol to provide up to 90% yield of benzaldehyde could be achieved over the course of 5 days. Both complexes showed similar reactivity in the two catalytic processes, and this is likely due to the weakly coordinating nature of the pendant donor within the tetradentate ligand.

scholarly journals Applications of Microbial Laccases: Patent Review of the Past Decade (2009–2019)

Catalysts ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1023 ◽  
Author(s):  
Anastasia Zerva ◽  
Stefan Simić ◽  
Evangelos Topakas ◽  
Jasmina Nikodinovic-Runic
Keyword(s):  
Enzymatic Reaction ◽  
Biofuel Cells ◽  
Production Costs ◽  
Redox Potentials ◽  
Biotechnological Applications ◽  
Oxidation Reactions ◽  
Food Industries ◽  
The Past ◽  
Patent Review ◽  
High Production

There is a high number of well characterized, commercially available laccases with different redox potentials and low substrate specificity, which in turn makes them attractive for a vast array of biotechnological applications. Laccases operate as batteries, storing electrons from individual substrate oxidation reactions to reduce molecular oxygen, releasing water as the only by-product. Due to society’s increasing environmental awareness and the global intensification of bio-based economies, the biotechnological industry is also expanding. Enzymes such as laccases are seen as a better alternative for use in the wood, paper, textile, and food industries, and they are being applied as biocatalysts, biosensors, and biofuel cells. Almost 140 years from the first description of laccase, industrial implementations of these enzymes still remain scarce in comparison to their potential, which is mostly due to high production costs and the limited control of the enzymatic reaction side product(s). This review summarizes the laccase applications in the last decade, focusing on the published patents during this period.

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