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Showing 1 to 20 of 58 for “"Selective Oxidation"”.
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Selective Oxidation Reactions: A Chemical Looping Approach
… hence investigated in this Dissertation for two selective oxidation reactions: (i) the epoxidation of ethylene to ethylene oxide, and (ii) the oxidative dehydrogenation (ODH) of ethane to ethylene. CL approach depends on the redox cycling of a solid oxygen carrier, typically a metal oxide, which …
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SELECTIVE OXIDATION OF CYCLOHEXANE TO K-A OIL USING HETEROGENEOUS CATALYSTS
… of innovative heterogeneous catalysts for the selective oxidation of cyclohexane to KA oil. Among the materials employed, supported and unsupported catalytic systems containing Fe, Co, Au, Cu, Ce and/or Zr were prepared and tested. The prepared materials were tuned through preparation and …
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Selective oxidation of cyclohexane to k-a oil using heterogeneous catalysts
… of innovative heterogeneous catalysts for the selective oxidation of cyclohexane to KA oil. Among the materials employed, supported and unsupported catalytic systems containing Fe, Co, Au, Cu, Ce and/or Zr were prepared and tested. The prepared materials were tuned through preparation and …
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The aerobic, water-assisted selective oxidation of methane over platinum-based catalysts
The selective oxidation of methane to C1-oxygenates such as methanol, formaldehyde and dimethylether remains one of the grand challenges of catalysis chemistry, due to the difficulty in attaining high selectivities at high methane conversions. This has been attributed to the higher reactivity of …
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Selective oxidation of methane in a trickle bed reactor over a platinum-based catalyst
… gas-phase, homogeneous liquid partial oxidation and heterogeneous catalytic partial oxidation, none of them were deemed successful for commercialization due to either the use of expensive reagents such as H2O2 and H2SO4, low yields and conversions, or inefficient system requirements. …
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Experimental and DFT study on selective oxidation of 5-Hydroxymethyl furfural over cadmium sulfide catalyst
… reduce dependency on conventional fossil fuels. Oxidation of 5-hydroximethyl furfural (HMF) is considered one of the most important biomass conversions, which resulted into value added 2,5-diformylfuran (DFF), 2,5-furandicarboxylic acid (FDCA), 5-hydroxymethyl-2-furancarboxylic acid (HMFCA), and …
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Reaction and Transport Coupling in Multi-Functional Catalysts for Selective Oxidation of Ammonia to Nitrogen
… and Cu or Fe-exchanged zeolite is utilized for selective oxidization of NH3 to N2 in the diesel engine emission control system. Pt catalyzes the oxidation of NH3 to four products (N2, N2O, NO, NO2) while the metal-exchanged zeolite concurrently catalyzes the selective catalytic reduction of …
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Selective oxidation of aluminum bearing III-V semiconductors with applications to quantum well heterostructure lasers
In the present work, a water vapor oxidation process is used to convert high Al-composition $\rm Al\sb{x}Ga\sb{1-x}As\ and\ In\sb{0.5}(Al\sb{x}Ga\sb{1-x})\sb{0.5}P$ to stable, device-quality native oxides. The insulating and low-refractive-index properties of the native oxide prove useful in the …
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Tuning the properties of titania and polymeric carbon nitride photocatalysts for total and selective oxidation reactions
En la Tesis Doctoral titulada "Fotocatalizadores basados en dióxido de titanio y nitruro de carbono polimérico en reacciones de oxidación total y selectiva", se han estudiado las reacciones de fotodegradación de contaminantes emergentes y fotooxidación selectiva de compuestos orgánicos a moléculas …
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Synthesis and Investigation of Phase-pure M1 MoVTeNbOx Catalysts for Selective Oxidation of Propane to Acrylic Acid
… von MoVTeNb-oxid Katalysatoren in der direkten Oxidation von Propan zu Acrylsäure in Verbindung gebracht wird. Andere Phasen, die gebildet werden, sind z. B. die orthorombische M2 Phase (isostrukturell mit KW3O9), Mo5O14, V0.95Mo0.97O5 und TeMo5O16. Wie mittels SEM/EDX gezeigt, zeichnen sich …
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Selective Oxidation of Aluminum-Bearing Iii-V Semiconductors: Properties and Applications to Small-Volume Quantum Well Heterostructure Lasers
"The same IILD + oxidation process is used to fabricate a two-dimensional active photonic lattice that is comprised of $\sim$9-$\mu$m microdisk lasers that are arranged in a triangular (hexagonal close-packed) lattice arrangement. The disks are closely spaced (11-$\mu$m center-to-center spacing) …
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Selective oxidation of aluminum-bearing III-V semiconductors: Properties and applications to small-volume quantum well heterostructure lasers
"In this work, the water-vapor oxidation of Al-bearing III-V compound semiconductors is used to fabricate small-volume semiconductor light-emitting devices. The oxidized material, native to the crystal, is mechanically and chemically stable. In addition, it is electrically insulating and has a low …
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Selective oxidation of aluminum-bearing III-V semiconductors: Properties and applications to quantum well heterostructure lasers and transistor devices
In this work, the water vapor oxidation of Al-bearing III-V compound semiconductors is used to fabricate light-emitting and electronic devices. High Al-composition heterostructure crystals such as Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As (x $\sbsp{\sim}{>}$ 0.5) are converted into a stable native oxide at …
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Selective Oxidations by Metalloporphyrins and Metallocorroles
… as well as in many useful metal-catalyzed oxidations. Many transition metal catalysts are designed for biomimetic studies of the predominant oxidation catalysts in Nature, the cytochrome P450 enzymes. In this work, a series of metalloporphyrin and metallocorrole complexes have been …
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Oxygen Atom Transfer Reactions Catalyzed by Molybdenum and Tungsten Oxo Transferase Mimics
The ability to mimic enzymatic oxidation reactions with synthetic catalysts is essential for advancing selective and sustainable chemical transformations. Nature employs molybdenum and tungsten enzymes to mediate oxygen atom transfer (OAT) reactions, which are critical in biological redox …
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Interactions between catalysts and oxygen carriers in chemical looping processes
… looping has been investigated for a variety of selective oxidation reactions, either with the metal oxide oxygen carrier acting as both an oxygen reservoir and a catalyst for selective oxidation, or, by preparing particles composed of a metal catalyst supported on an oxygen carrier. During …
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TOWARDS SUSTAINABLE CATALYSIS: DESIGN OF EARTH-ABUNDANT METAL COMPLEXES FOR WASTE VALORIZATION
… in homogeneous catalysis. First chapter: selective oxidation of alcohols using iron(III) pyclen ligand complexes as catalyst and hydrogen peroxide as oxidant. Application and mechanistic insights. Structural and spectroscopical investigation of oxo-bridged iron complexes by XRD and Raman …
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THE STUDY OF PYRENEDIONE AS A PHOTOREDOX CATALYST AND A FLUOROMETRIC PROBE FOR VISUAL DETECTION AND QUANTIFICATION OF TRYPTOPHAN
… via C-H activation is disclosed. Finally, the selective oxidation of tryptophan and cysteine, among other amino acids by 1,8-PYD is presented. An easy and sensitive method for the visual detection and quantification of tryptophan in soy sauce has been developed using 1,8-PYD as a turn-on …
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Oxygen atom transfer with manganese-exchanged metal-organic frameworks
… continued interest in the discovery of new selective oxidation catalysts from both a fundamental and applied perspective. Metal-organic frameworks (MOFs) are an attractive platform for catalysis because they enable access to unique coordination environments and reactivities; this is due in …
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