2 edition of catalytic vapourphase oxidation of hydrocarbons on manganese dioxide. found in the catalog.
catalytic vapourphase oxidation of hydrocarbons on manganese dioxide.
Levente Laszlo Diosady
Written in English
|Contributions||Toronto, Ont. University.|
|The Physical Object|
|Pagination||v, 102 leaves.|
|Number of Pages||102|
The gas phase oxidation of toluene was studied as an alternative way to obtain benzaldehyde and benzoic acid. A traditional support (TiO2) and a . For oxidation by manganese dioxide, normalization of rate constants (to the 4-chloro congener) allowed correlation of phenol and aniline data from multiple sources to give one, unified.
The authors have synthesized nanofibrous aluminum oxyhydroxide (AlOOH), modified with different amounts of manganese ions (II), which is the precursor for methane deep oxidation catalysts. It was shown that the catalytic activity of the manganese-based system obtained depends on manganese amount and thermal activation conditions. It is approved that as the catalyst for deep oxidation Author: Olga I. Sidorova, Sergey Galanov, Elena N. Gryaznova, Ludmila N. Shiyan. Decomposition of Hydrogen Peroxide on MnO2/TiO2 Catalysts. Comparative study of supported CuOx and MnOx catalysts for the catalytic wet air oxidation of β-naphthol. Applied Surface Science, Vol. , No. 22 Experimental Assessment of Heterogeneous Catalysts for the Decomposition of Hydrogen by:
Variously treated samples of a low-cost MnO 2 –SiO 2 catalyst designed in the first instance for the complete vapour-phase oxidation of hydrocarbon and other vapours in pollution-control applications have been examined. The EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near-edge structure) characteristics of samples deliberately Cited by: Examples are nickel, such as Raney nickel for hydrogenation, and vanadium(V) oxide for oxidation of sulfur dioxide into sulfur trioxide by the so-called contact process. Many catalytic processes, especially those used in organic synthesis, require "late transition metals", such as palladium, platinum, gold, ruthenium, rhodium, or iridium.
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CATALYTIC OXIDATION OF HYDROCARBONS Marek (4)believes that a catalyst accelerating the first step will accelerate all the subsequent steps as well, since it is difficult to conceive a catalyst that would accelerate the oxidation of hydrocarbons and have no effect on the oxidation of formaldehyde to water and carbon by: Manganese oxide (MnO 2) plays an important role in the transformation of organic contaminants, such as polycyclic aromatic hydrocarbons (PAHs), in environmental compartments.
In this study, various MnO 2 polymorphs were prepared, and their catalytic activities were evaluated using anthracene (ANT) as a model molecule without light irradiation.
Carbon oxide methanation reactions 2 and 3 have also been used for various applications, such as hydrogen purification for use in ammonia synthesis and fuel cells, producing synthetic natural gas (SNG) and chemical storage of electricity (1) (2) (3) Significant quantities of carbon monoxide and carbon dioxide, present as undesirable byproducts, can inhibit commercialization of different processes, especially those involving the catalytic synthesis of by: 1.
Recent studies have shown that manganese dioxide (MnO2) can significantly accelerate the oxidation kinetics of phenolic compounds such as triclosan and chlorophenols by potassium permanganate (Mn(VII)) in slightly acidic solutions.
However, the role of MnO2 (i.e., as an oxidant vs catalyst) is still unclear. In this work, it was demonstrated that Mn(VII) oxidized triclosan Cited by: Chen J, Lin JC, Purohit V, Cutlip MB, Suib SL. Photoassisted catalytic oxidation of alcohols and halogenated hydrocarbons with amorphous manganese oxides.
Catal Today ;– Google Scholar. Segal SR, Suib SL, Tang X, Satyapal S. Photoassisted decomposition of dimethyl methylphosphonate over amorphous manganese Author: Simon Ristig, Niklas Cibura, Jennifer Strunk.
Manganese dioxide is one of the more stable species among the different oxidation states of manganese. Therefore, the aim of the present study was to check the catalytic ability of commercial manganese dioxide and to investigate the pH and temperature for the best catalytic activity of this catalyst.
Effect of pHFile Size: KB. Abstract. In the series of reagents used in heterogeneous oxidation reactions, active manganese dioxide has acquired a prominent place among such oxidants as copper oxide, mercury(II) oxide, silver oxide, lead dioxide, sodium bismuthate, 1–3 nickel peroxide, 4, 5 manganese(III) acetate, 6, 7 silver carbonate on Celite, 8 seloxcette 9 (chromic anhydride intercalated in graphite), and Cited by: Oxidation by Molecular Oxygen Any additive which could react with free radicals formed in such processes to yield stable adducts will inhibit the oxidation .
Mechanism of Catalysis by Transition Metal Salts Ions of transition metals (homogeneously or in some cases supported on polymers ) also effectively catalyze the Size: 4MB.
The products of hydrocarbon oxidation in SCWO are carbon dioxide and water. Heteroatoms are converted to inorganic compounds, usually acids, salts, or oxides in high oxidation states.
Phosphorus is converted into phosphate, and sulphur to sulfate; nitrogen-containing compounds are oxidized to nitrogen gas. Manganese dioxide is probably most useful for the oxidation of allylic and benzylic alcohols. In a synthesis of polygalolide A, Adachi et al.
oxidized the allylic alcohol unit in 78 to give conjugated ketone 79 in 64% yield using manganese dioxide. The rate of oxidation of alcohols by MnO 2 is diminished by the steric hindrance around the carbon bearing the hydroxyl moiety. Finally, it is reported in the literature that manganese oxide catalysts, such as Mn 2O 3, exhibit high performances in the catalytic oxidation of VOCs.
The most active manganese oxide catalysts were those with the best redox properties and the highest oxygen mobility , .Cited by: Highly Enantioselective Oxidation of Spirocyclic Hydrocarbons by Bioinspired Manganese Catalysts and Hydrogen Peroxide. ACS Catalysis8 (3), DOI: /acscatal.7b Valeria Dantignana, Michela Milan, Olaf Cussó, Anna Company, Massimo Bietti, and Miquel by: Hydrocarbon oxyfunctionalization is a crucial industrial process.
Most metallic catalysts require higher temperatures and often show lower selectivities. One of the intellectual approaches is the mimicry for by: A novel domino oxidative Ugi-type three-component reaction of aromatic hydrocarbons (OU-3CR) has been investigated with aromatic hydrocarbons of petroleum naphtha using two biopolymer supported MnO 2 nanostructured catalysts, MnO 2 @cellulose–SO 3 H and MnO 2 @wool–SO 3 H, for the synthesis of α-amino amides, 3,4-dihydroquinoxalinamine, 4H.
Polycyclic Aromatic Hydrocarbons (PAHs) are a group of Volatile Organic Compounds (VOCs), which have serious health problems associated with their emission into the atmosphere.
Catalytic oxidation is an effective abatement process to control PAH emissions, and the types of catalysts investigated have been reviewed. possessed a superior catalytic activity to that of CuO and MnO x for the oxidation of CO, C 10H 8 and C 2H 4, while for the oxidation of CH 4, CuO was largely more active than noble metals, and MnO x as active as Pd and Pt.
Some mixed metal oxide-noble metal catalysts showed decreased activity. The OL-1 nanoflowers possess the highest concentration of oxygen vacancies or Mn3+, followed by the OL-1 nanowires and nanosheets. The result of catalytic tests shows that the OL-1 nanoflowers exhibit a tremendous enhancement in the catalytic activity for benzene oxidation as compared to the OL-1 nanowires and by: I.
3 Oxygenation of hydrocarbons catalyzed by manganese complexes of flexible and redox innocent ligands Manganese complexes of the tridentate macrocycle ligand 1,4,7-triazacyclononane (tacn) and in particular complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane (Me 3tacn) (1) have been studied extensively in oxidation chemistry.
Documents up-to-date developments in the study of catalysis and its applications to organic synthesis and industrial processes.
The text examines the area of homogenous and heterogenous catalysis for industrial and pharmaceutical chemicals, focusing on recent advances in asymmetric synthesis, environmental uses, acid-based synthesis, hydrogenation, oxidation, alkylation, 5/5(1).
Catalytic oxidation of polycyclic aromatic hydrocarbons (PAHs) over SBA supported metal catalysts Article in Journal of Industrial and Engineering Chemistry 17(2)– March. Manganese oxides are a highly promising class of materials as they are known to be catalytically active in several oxidation reactions such as the oxidation of CO [8,9], soot , or hydrocarbons.Catalytic structures are provided comprising octahedral tunnel lattice manganese oxides ion-exchanged with metal cations or mixtures thereof.
The structures are useful as catalysts for the oxidation of alkanes and may be prepared by treating layered manganese oxide under highly acidic conditions, optionally drying the treated product, and subjecting it to ion : Helge Jaensch, Wilfried J. Mortier.Manganese(IV) oxide.
Recent Literature. Manganese dioxide is employed as an in situ oxidant for the one-pot conversion of alcohols into imines. In combination with polymer-supported cyanoborohydride (PSCBH), a one-pot oxidation-imine formation-reduction sequence enables alcohols to be converted directly into both secondary and tertiary amines.