A5101970416- Catalytic Processes in Materials Science
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Oxidative Organic Chemistry Reactions
- Mesoporous Materials and Catalysis
- Surface Chemistry and Catalysis
- Electrocatalysts for Energy Conversion
- Crystallography and molecular interactions
- Zeolite Catalysis and Synthesis
- Nanomaterials for catalytic reactions
- Asymmetric Hydrogenation and Catalysis
- Catalysts for Methane Reforming
- Free Radicals and Antioxidants
- Polyoxometalates: Synthesis and Applications
- Metal-Catalyzed Oxygenation Mechanisms
- Porphyrin and Phthalocyanine Chemistry
- Metal complexes synthesis and properties
- Gold and Silver Nanoparticles Synthesis and Applications
- Microfluidic and Capillary Electrophoresis Applications
- Collagen: Extraction and Characterization
- Magnetism in coordination complexes
- Petroleum Processing and Analysis
Cardiff University
2012-2024
Defence Science and Technology Laboratory
2009
King's College London
2009
Rutherford Appleton Laboratory
2004-2009
University of Bristol
2009
Kodak (United Kingdom)
2004
Monsanto (United States)
1960
Selective oxidation of primary carbon-hydrogen bonds with oxygen is crucial importance for the sustainable exploitation available feedstocks. To date, heterogeneous catalysts have either shown low activity and/or selectivity or required activated donors. We report here that supported gold-palladium (Au-Pd) nanoparticles on carbon TiO(2) are active in toluene and related molecules, giving high selectivities to benzyl benzoate under mild solvent-free conditions. Differences between catalytic...
A radical route from methane to methanol The conversion of into chemicals usually proceeds through high-temperature routes that first form more reactive carbon monoxide and hydrogen. Agarwal et al. report a low-temperature (50°C) in aqueous hydrogen peroxide (H 2 O ) for oxidizing high yield (92%). They used colloidal gold-palladium nanoparticles as catalyst. primary oxidant was ; isotopic labeling showed H activated methyl radicals, which subsequently incorporated . Science , this issue p. 223
Iron copper zeolite (Fe-Cu-ZSM-5) with aqueous hydrogen peroxide is active for the selective oxidation of methane to methanol. involved in activation carbon–hydrogen bond, while allows methanol form as major product. The catalyst stable, re-usable and activates giving >90 % selectivity 10 conversion a closed catalytic cycle (see scheme).
Direct and selective: Supported gold–palladium nanoparticles are active for the oxidation of methane, giving a high selectivity formation methyl hydroperoxide methanol, using hydrogen peroxide as oxidant (see picture). The optimal methanol is achieved by performing reaction in presence that has been generated situ from oxygen.
The reaction of glycerol with urea to form carbonate is mostly reported in the patent literature and date there have been very few fundamental studies mechanism. Furthermore, most previous involved homogeneous catalysts whereas identification heterogeneous for this would be highly beneficial. This a attractive that utilises two inexpensive readily available raw materials chemical cycle overall, results fixation CO2. also provides route up-grade waste produced large quantities during...
The development of a catalytic, one-step route for the oxidation methane to methanol remains one greatest challenges within catalysis. Of particular importance is need develop an efficient that proceeds under mild reaction conditions so as avoid deeper and economic limitations currently practiced syngas route. Recently, it was demonstrated copper- iron-containing zeolite catalyst such process. in question (Cu–Fe–ZSM-5) capable selectively transforming aqueous medium with hydrogen peroxide...
Abstract The partial oxidation of methane to methanol presents one the most challenging targets in catalysis. Although this is focus much research, until recently, approaches had proceeded at low catalytic rates (<10 h −1 ), not resulted a closed cycle, or were unable produce with reasonable selectivity. Recent research has demonstrated, however, that system composed an iron‐ and copper‐containing zeolite able catalytically convert turnover frequencies (TOFs) over 14 000 by using H 2 O as...
Fe- and Cu-containing zeolites have recently been shown to be efficient catalysts for the one-step selective transformation of methane into methanol in an aqueous medium at only 50 °C, using H2O2 as green oxidant. Previously, we observed that Fe species alone are capable catalyzing this highly transformation. However, further catalytic testing spectroscopic investigations demonstrate although these extra-framework active component catalyst, significant promotion is upon incorporation other...
Ein Eisen-Kupfer-Zeolith (Fe-Cu-ZSM-5) katalysiert die selektive Oxidation von Methan zu Methanol mit wässrigem Wasserstoffperoxid. Das Eisen aktiviert Kohlenstoff-Wasserstoff-Bindung, während das Kupfer dafür sorgt, dass als Hauptprodukt gebildet wird. Der Katalysator ist stabil und wiederverwendbar >90 % Selektivität 10 Umsatz in einem geschlossenen Katalysezyklus (siehe Schema). Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents...
The synthesis of a series rhenium fac tricarbonyl bisimine complexes and their application as lumophores in fluorescence imaging yeast human adenocarcinoma cells is reported. A wide range are synthesised with varying charges lipophilicities, all which have photophysical properties make them suitable cell agents. After attempts to apply these agents various strains showed limited uptake, an investigation was undertaken applications mammalian cells. In general the uptake high short-term...
Au-Pd nanoparticles having a mean particle size of 3–4 nm and supported on titania (see figure; scale bar 2 nm) exhibit high activity in the selective oxidation aromatic hydrocarbons using tert-butyl hydroperoxide as an oxidant. The stabilize surface-bound radicals.
Iron and copper containing ZSM-5 catalysts are effective for the partial oxidation of ethane with hydrogen peroxide giving combined oxygenate selectivities productivities up to 95.2% 65 mol kgcat(-1) h(-1), respectively. High conversion (ca. 56%) acetic acid 70% selectivity) can be observed. Detailed studies this catalytic system reveal a complex reaction network in which gives range C2 oxygenates, sequential C-C bond cleavage generating C1 products. We demonstrate that ethene is also formed...
Selective oxidation of methane using AuPdCu/TiO<sub>2</sub> catalysts.
Direkt und selektiv: Trägerfixierte Gold-Palladium-Nanopartikel sind aktiv in der Oxidation von Methan zeigen mit Wasserstoffperoxid als Oxidationsmittel eine hohe Selektivität bei Bildung Methylhydroperoxid Methanol (siehe Bild). Die optimale für die Methanolbildung wird erreicht, wenn Reaktion Gegenwart Wasserstoffperoxid, das situ aus Wasserstoff Sauerstoff entsteht, ausgeführt wird.
The particulate produced by internal combustion engines has a complex composition that includes large proportion of porous soot within which condensed and adsorbed organic molecules are trapped. However, many studies the catalytic based on assumption commercially carbon can be used as reliable mimic engine soot. Here we show removed from diesel filter is rich in polyaromatic precursors solid particulate. Through combination solvent extraction evolved gas analysis, have been able to track...
Heat treating Fe/ZSM-5 under hydrogen leads to high dispersion of Fe species and higher alcohol selectivity in the oxidation alkanes, as compared oxygen treated catalysts.
Molybdenum blue (MB), a multivalent molybdenum oxide with nano-ring morphology is well-known in analytical chemistry but, to date it has been largely ignored other applications.
Abstract Giant neural cell systems (dendrites, bodies, and axons) are present among more usual structures in the retina optic nerve of small whale (dolphin) Tursiops truncatus retina. body dimensions range up to 75 μm diameter. Nuclei cells frequently larger (>20 μm) than nearby ganglion, bipolar, receptor bodies. The presence giant system elements fiber layer agree with unusually broad spectrum dolphin where 6% axons >15 Smaller size distribution typical found terrestrial mammals....
The rates of catalytic oxidative decontamination the chemical warfare agent (CWA) sulfur mustard (HD, bis(2-chlororethyl) sulfide) and a range (chloroethyl) sulfide simulants variable lipophilicity have been examined using hydrogen peroxide-based microemulsion system. SANS (small-angle neutron scattering), SAXS X-ray PGSE-NMR (pulsed-gradient spin-echo NMR), fluorescence quenching, electrospray mass spectroscopy (ESI-MS) were implemented to examine distribution HD, its simulants, their...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis of halodisilanes and the formation insertion reactions chlorosilylene fluorosilyleneR. L. Jenkins, A. J. Vandersielen, S. P. Ruis, R. Gird, M. RingCite this: Inorg. Chem. 1973, 12, 2968–2972Publication Date (Print):December 1, 1973Publication History Published online1 May 2002Published inissue 1 December 1973https://pubs.acs.org/doi/10.1021/ic50130a046https://doi.org/10.1021/ic50130a046research-articleACS PublicationsRequest reuse...