4 edition of Alkane oxidations in a micellar/mitalloporphyrin catalytic system found in the catalog.
Alkane oxidations in a micellar/mitalloporphyrin catalytic system
Jason A. Peebles
Thesis (M.A.Sc.) -- University of Toronto, 1994.
|Series||Canadian theses = -- Thèses canadiennes|
|The Physical Object|
|Pagination||1 microfiche : negative. --|
Methane monooxygenases (MMOs) mediate the facile conversion of methane into methanol in methanotrophic bacteria with high efficiency under ambient conditions. Because the selective oxidation of methane is extremely challenging, there is considerable interest in understanding how these enzymes carry out this difficult chemistry. The impetus of these efforts is to learn from the microbes to. Hydrocarbons, in particular alkanes, are the main components of gas and oil and are a good example of such raw materials. The C–H bond(s) of these compounds can be transformed into C–OH or C=O groups that will lead to the production of high added value products with applications in fine chemistry.
Alkane metathesis is a class of chemical reaction in which an alkane is rearranged to give a longer or shorter alkane product. It is similar to olefin metathesis, except that olefin metathesis cleaves and recreates a carbon-carbon double bond, but alkane metathesis operates on a carbon-carbon single bond.. Examples and catalysts. Alkane metathesis is catalyzed by metal-containing compounds or. (c) Catalytic oxidation: (i) Lower alkanes are easily converted to alcohols and aldehydes under controlled catalytic oxidation. (ii) Higher alkanes on oxidation in presence of manganese acetate give fatty acids. CH 3 (CH 2) n CH 3 + 3O 2 CH 3 (CH 2) n COOH (d) Chemical oxidation: Tertiary alkanes are oxidized to tertiary alcohols by KMnO 4. 2.
Hydrocarbons comprise the simplest series of organic compounds. These compounds are composed of carbon and hydrogen atoms in single, double, and triple bonds. Depending on the type of central bond present, the hydrocarbon can be classified as an alkane (single bond), alkene (double bond), or alkyne (triple bond). A diene contains two double bonds. The diﬀerences in catalytic performance within the series clearly illustrate that the structural motif as the most popular descriptor in oxidation catalysis is not essential, since all MnWO 4 catalysts in the series under study exhibit the same bulk crystal structure and bulk chemical composition and are phase pure and homogenous.
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Oxidation of light alkanes with Eu(III) catalytic systems. The catalytic system composed of EuCl 3 / Zn powder / CH 3 CO 2 H / CH 2 Cl 2 (as solvent) was not appropriate for the oxidation of CH 4 to CH 3 OH because CH 3 Alkane oxidations in a micellar/mitalloporphyrin catalytic system book and CO 2 were produced mainly from CH 3 CO 2 H.
A novel class of catalysts for alkane oxidation with molecular oxygen was examined. N-Hydroxyphthalimide (NHPI) combined with Co(acac)n (n = 2 or 3) was found to be an efficient catalytic system for the aerobic oxidation of cycloalkanes and alkylbenzenes under mild conditions.
Cycloalkanes were successfully oxidized with molecular oxygen in the presence of a catalytic amount of NHPI and Cited by: Advances in Catalytic Technologies for Selective Oxidation of Lower Alkanes: /ch The main challenge for selective oxidation catalysis has always been achieving an economically viable selectivity.
In this chapter, the advances made aroundCited by: 1. A systematic gas phase-dependence of the electron work function, electron affinity, band bending and the high frequency electrical conductivity of the prospective oxidation catalyst MoVTeNbOx with orthorhombic M1 structure was identified under selective alkane oxidation conditions.
The conductivity measured in a fixed bed flow reactor at 1 bar with a noncontact microwave technique and the Cited by: Alkane oxidation reactions.
All the catalytic reactions were performed in 2-mL Wheaton ® vials sealed with teflon-faced silicon septa. Reactions were conducted under magnetic stirring, at 25 °C, for 90 min, according to procedures adapted from de Sousa et al. Oxidation was carried out in air; either PhI(OAc) 2 orCited by: 8.
These sacrificial oxidants, themselves the product of oxidation reactions, have been used in catalytic systems involving tailored transition-metal complexes in either a homogeneous state4,5,6.
The catalytic activity of a hybrid compound, [Cu(salen)-POM], (1) consisting of Cu (II)(salen)[H 2 salen= N,N′-bis(salicylidene)ethylenediamine] complex covalently linked to a Keggin type polyoxometalate (POM), K 8 SiW 11 O 39, was studied in the oxidation of various alkanes and alkenes in acetonitrile, using hydrogen peroxide as oxygen[Cu(salen)-POM] catalyst showed.
Alkanes can be oxidized to carbon dioxide and water via a free‐radical mechanism. The energy released when an alkane is completely oxidized is called the heat of combustion.
For example, when propane is oxidized, the heat of combustion is kilocalories per mole. Identifying surface-active sites and reaction pathways is of great significance in heterogeneous catalysis.
However, even for the simplest catalytic reaction, there could exist a myriad of possible active sites and reaction intermediates, rending exhaustive computational and experimental investigations of all possible reaction pathways difficult. For the oxychlorination of C3H8 over CeO2.
Catalytic oxidations. The oxidations of hydrocarbons were carried out in MeCN at 25 °C in air in thermostated Pyrex cylindrical vessels with vigorous stirring.
The total volume of the reaction solution was 5 mL. Initially, a portion of solid MCPBA (“Fluka”) was added to the solution of the catalyst, co-catalyst and substrate. This report describes a highly catalytic bimetallic system for the low temperature selective oxidation of methane, ethane, and butane with dioxygen as the oxidant.
The catalytic system consists of a mixture of copper chloride and metallic palladium and operates in a mixture (v/v) of trifluoroacetic acid and water in the presence of dioxygen and carbon monoxide. Methane was selectively.
The characteristic properties of the catalytic materials prepared are shown in Table surface area of the samples varies from 43 to m 2 /g. This large variation is mainly due to the initial difference in the surface area of the supports used ( m 2 /g for TiO 2 and m 2 /g for Al 2 O 3).The MoO x theoretical surface coverage of the molybdenum-containing samples was.
In organic chemistry, an alkene is an unsaturated hydrocarbon that contains a carbon–carbon double rated hydrocarbons containing two or more double bonds are known as alkadienes, alkatrienes, alkatetraenes, and so on. The words alkene and olefin are often used interchangeably (see nomenclature section below).
Acyclic alkenes, with only one double bond and no other functional. Conversion of light alkanes into industrial chemical olefins via oxidative dehydrogenation (ODH) is a promising route because of favorable thermodynamic and kinetic characteristics, but encounters difficulties in selectivity control for olefins because of over-oxidation reactions that produce a substantial amount of undesired carbon oxides.
Compared to widely-developed metal oxide-based. For PDF Notes and best Assignments visit @ To support me in my journey you can donate ([email protected] ) or Alakh Pande. oxidation of alkanes to alkenes, catalytic oxidation of alkanes, controlled oxidation of alkanes Oxidation of alkanes by Rashid Sir.
Category Education; Show more Show less. Since this is accompanied by an increasing catalytic activity and selectivity, it indicates that vanadyl oxygen is actively involved in the selective oxidation of the alkane.
View Show abstract. Alkanes: Oxidation Introduction to Alkanes Alkenes: Nomenclature Alkenes: Catalytic Addition of Hydrogen Alkenes: Addition of Carbenes Removing #book# from your Reading List will also remove any bookmarked pages associated with this title.
The kinetic characteristics of the oxidizing species generated by the catalytic system Cu(II) complex–H 2 O 2 in CH 3 CN were obtained from the dependence of the alkane oxidation. Indeed, Cu(ii)/O 2, Fe(iii)/O 2 and polyoxometallate [H 3 PMo 9 V 3 O 40]/O 2 can act as effective oxidants for alkane oxidations.
43 Periana discovered that SO 3 or H 2 SO 4 is an active oxidant for the catalytic oxidation of methane to methyl bisulfate in high yields. The ability of the complex to catalyze oxidation of several alkanes and alkenes has been investigated by using CH 3 COOH/H 2 O 2 () as an oxidative system.
Moderate activity in cyclohexane oxidation (TOF = 33 h –1) and good activity in cyclohexene oxidation .The analysis of catalytic partial oxidation of light alkanes indicates that processes involving this group proceed via the formation and consecutive transformations of free radicals.
Depending on the properties of the catalytic system and reaction conditions the same primary radical can give different final products, olefins, oxygenated organic substances and carbon oxides.Catalytic oxidation of benzylic C–H bonds could be efficiently realized using IBS as a catalyst which was generated in situ from the oxidation of sodium 2-iodobenzenesulfonate (1b) by Oxone in the presence of a phase-transfer catalyst, tetra-n-butylammonium hydrogen sulfate, in anhydrous acetonitrile at 60 °.