Oxidation reactions catalyzed by osmium compounds. Part 4. Highly efficient oxidation of hydrocarbons and alcohols including glycerol by the H2O2/Os3(CO)12/pyridine reagent

RSC Advances ◽  
2013 ◽  
Vol 3 (35) ◽  
pp. 15065 ◽  
Author(s):  
Georgiy B. Shul'pin ◽  
Yuriy N. Kozlov ◽  
Lidia S. Shul'pina ◽  
Wagner A. Carvalho ◽  
Dalmo Mandelli
Keyword(s):  
Oxidation Reactions ◽  
Highly Efficient ◽  
Oxidation Of Hydrocarbons

scholarly journals Hierarchically skeletal multi-layered Pt-Ni nanocrystals for highly efficient oxygen reduction and methanol oxidation reactions

2021 ◽  
Vol 42 (4) ◽  
pp. 648-657
Author(s):  
Shibo Li ◽  
Zhi Qun Tian ◽  
Yang Liu ◽  
Zheng Jang ◽  
Syed Waqar Hasan ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Methanol Oxidation ◽  
Oxidation Reactions ◽  
Highly Efficient

scholarly journals Further investigations on the kinetics of gaseous oxidation reactions

1930 ◽  
Vol 129 (810) ◽  
pp. 284-299 ◽  
Keyword(s):  
Rate Of Change ◽  
Chain Mechanism ◽  
Oxidation Reactions ◽  
Chain Reactions ◽  
Oxidation Of Methane ◽  
Simple Order ◽  
Oxidation Of Hydrocarbons ◽  
Rate Of Reaction ◽  
A Chain ◽  
Kinetics Of

Investigation of the kinetics of the oxidation of ethylene and of benzene showed that these reactions are peculiar in the following respects. First, the relation between the rate of reaction and concentration is such that the reactions possess no simple “order,” though the nearest integral value for the order is about the third of fourth. The rate increases very rapidly with increasing hydrocarbon concentration, but is relatively little influenced by oxygen; under some conditions oxygen may have a retarding influence. Secondly, the reactions can be slowed down by increasing the surface exposed to the gases. This indicates that the oxidation occurs by a chain mechanism. Thirdly, the rate of change of pressure accompanying the oxidation only attains its full value after an induction period, during which evidently intermediate products are accumulating. Accepting the fact that the oxidations are probably chain reactions, the relation between rate and concentration shown that the chains are much more easily propagated when the intermediate active molecules encounter more hydrocarbon than when they encounter oxygen. Following the view of Egerton, and consistently with previous work on the combination of hydrogen and oxygen, the working hypothesis adopted is that some intermediate peroxidised substance is responsible for the propagation of the chains. This being so, the question arises whether the peculiarities found in the oxidation of hydrocarbons will also be found with substances already containing oxygen. To investigate, therefore, the influence of chemical configuration on the mechanism of oxidation reactions the following series of compounds has been studied CH 4 CH 3 OH HCHO which represent the stages through which Bone and others have shown the oxidation of methane to occur.

scholarly journals Heterogeneous catalysis with encapsulated haem and other synthetic porphyrins: Harnessing the power of porphyrins for oxidation reactions

2018 ◽  
Vol 16 (1) ◽  
pp. 763-789 ◽  
Author(s):  
Nicola A. Dare ◽  
Timothy J. Egan
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysis ◽  
Heterogeneous Catalysts ◽  
Organic Substrates ◽  
Oxidation Reactions ◽  
Highly Efficient ◽  
Protein Environment

AbstractEncapsulated metalloporphyrins have been widely studied for their use as efficient heterogeneous catalysts, inspired by the known catalytic activity of porphyrins in haemoproteins. The oxidation of organic substrates by haemoproteins is one of the well-known roles of these proteins, in which the haem (ferriprotoporphyrin IX = FePPIX) cofactor is the centre of reactivity. While these porphyrins are highly efficient catalysts in the protein environment, once removed, they quickly lose their reactivity. It is for this reason that they have garnered much interest in the field of heterogeneous catalysis of oxidation reactions. This review details current research in the field, focusing on the application of encapsulated haem, and other synthetic metalloporphyrins, applied to oxidation reactions.

A nickel-modified polyoxometalate towards a highly efficient catalyst for selective oxidation of hydrocarbons

2014 ◽  
Vol 2 (32) ◽  
pp. 12686 ◽  
Author(s):  
Lei Zhou ◽  
Juan Liu ◽  
Wenbin Ji ◽  
Hui Huang ◽  
Hailiang Hu ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Efficient Catalyst ◽  
Highly Efficient ◽  
Oxidation Of Hydrocarbons

scholarly journals Fast electrosynthesis of Fe-containing layered double hydroxide arrays toward highly efficient electrocatalytic oxidation reactions

2015 ◽  
Vol 6 (11) ◽  
pp. 6624-6631 ◽  
Author(s):  
Zhenhua Li ◽  
Mingfei Shao ◽  
Hongli An ◽  
Zixuan Wang ◽  
Simin Xu ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Small Molecule ◽  
Electrocatalytic Oxidation ◽  
Oxidation Reactions ◽  
Highly Efficient ◽  
Electrocatalytic Performance ◽  
Double Hydroxide

Fast electrosynthesis of Fe-containing layered double hydroxide arrays and their highly-efficient electrocatalytic performance toward small molecule oxidation reactions.

scholarly journals The kinetics of the oxidation of gaseous benzene

1930 ◽  
Vol 127 (804) ◽  
pp. 218-227 ◽  
Keyword(s):  
High Ratio ◽  
Chain Mechanism ◽  
Homogeneous Reaction ◽  
Oxidation Reactions ◽  
High Concentration ◽  
Ethylene Concentration ◽  
Oxidation Of Hydrocarbons ◽  
Kinetics Of ◽  
Gaseous Benzene ◽  
Oxidation Of Benzene

The comparatively few exothermic gaseous oxidation reactions which have been investigated kinetically nearly all exhibit interesting peculiarities of behaviour connected with the existence of the “chain” mechanism. The oxidation of hydrocarbons is an example to which considerable attention is at present being given. The rate of oxidation is sometimes retarded by an increase in the surface of the containing vessel—a fact which points directly to the existence of reaction chains—and the relation between the rate and the concentrations of the gases is often a remarkable one. Thus ethylene is oxidised at a speed which is relatively little affected by the oxygen concentration but depends upon a high power of the ethylene concentration. Similar relations hold good for acetylene, It seemed, therefore, of interest to study the oxidation of gaseous benzene, partly to ascertain what would be the behaviour of a hydrocarbon of a quite different kind of structure, and partly because benzene is a substance of inherent chemical importance. The results indicate that the oxidation of benzene is a homogeneous reaction in which chains play a part, though not so important a part as, for example, in the combination of hydrogen and oxygen. Kinetically the reaction resembles the oxidation of ethylene in many respects. In particular, rapid oxidation both of benzene and ethylene is markedly favoured by a high concentration of the hydrocarbon, and, other things being equal, by a high ratio of hydrocarbon to oxygen. From this it appears that the primary product of oxidation gives rise to chains by reacting with more hydrocarbon, but not so readily by reacting with oxygen.

scholarly journals Biologically inspired oxidation catalysis using metallopeptides

2018 ◽  
Vol 47 (6) ◽  
pp. 1755-1763 ◽  
Author(s):  
Laia Vicens ◽  
Miquel Costas
Keyword(s):  
High Efficiency ◽  
Coordination Complexes ◽  
Oxidation Catalysis ◽  
Metal Coordination ◽  
Oxidation Reactions ◽  
Biologically Inspired ◽  
Promising Strategy ◽  
Oxidation Of Hydrocarbons

Metalloenzymes can catalyze the oxidation of hydrocarbons with high efficiency and selectivity. For this reason, they are taken as inspiration for the development of new catalyst. A promising strategy is the combination of metal coordination complexes and peptide chains. The use of metallopeptides in oxidation reactions is discussed.

Novel, benign, solid catalysts for the oxidation of hydrocarbons

2005 ◽  
Vol 363 (1829) ◽  
pp. 1001-1012 ◽  
Author(s):  
Paul Ratnasamy ◽  
Robert Raja ◽  
Darbha Srinivas
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Metal Ion ◽  
Copper Phthalocyanine ◽  
Zeolite Y ◽  
Copper Acetate ◽  
Porous Solids ◽  
Oxidation Reactions ◽  
Solid Catalysts ◽  
Oxidation Of Hydrocarbons

The catalytic properties of two classes of solid catalysts for the oxidation of hydrocarbons in the liquid phase are discussed: (i) microporous solids, encapsulating transition metal complexes in their cavities and (ii) titanosilicate molecular sieves. Copper acetate dimers encapsulated in molecular sieves Y, MCM-22 and VPI-5 use dioxygen to regioselectively ortho -hydroxylate l -tyrosine to l -dopa, phenol to catechol and cresols to the corresponding o -dihydroxy and o -quinone compounds. Monomeric copper phthalocyanine and salen complexes entrapped in zeolite-Y oxidize methane to methanol, toluene to cresols, naphthalene to naphthols, xylene to xylenols and phenol to diphenols. Trimeric μ 3 -oxo-bridged Co/Mn cluster complexes, encapsulated inside Y-zeolite, oxidize para -xylene, almost quantitatively, to terephthalic acid. In almost all cases, the intrinsic catalytic activity (turnover frequency) of the metal complex is enhanced very significantly, upon encapsulation in the porous solids. Spectroscopic and electrochemical studies suggest that the geometric distortions of the complex on encapsulation change the electron density at the metal ion site and its redox behaviour, thereby influencing its catalytic activity and selectivity in oxidation reactions. Titanosilicate molecular sieves can oxidize hydrocarbons using dioxygen when loaded with transition metals like Pd, Au or Ag. The structure of surface Ti ions and the type of oxo-Ti species generated on contact with oxidants depend on several factors including the method of zeolite synthesis, zeolite structure, solvent, temperature and oxidant. Although, similar oxo-Ti species are present on all the titanosilicates, their relative concentrations vary among different structures and determine the product selectivity.

Highly efficient base catalysis and sulfide oxidation reactions over new functionalized mesoporous polymers

RSC Advances ◽  
2012 ◽  
Vol 2 (16) ◽  
pp. 6464 ◽  
Author(s):  
Noor Salam ◽  
Paramita Mondal ◽  
John Mondal ◽  
Anupam Singha Roy ◽  
Asim Bhaumik ◽  
...  
Keyword(s):  
Sulfide Oxidation ◽  
Base Catalysis ◽  
Oxidation Reactions ◽  
Highly Efficient
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