Results 211 to 220 of about 248,548 (257)
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Science, 2017
Catalysis The hydrogenation of carbon dioxide is a key step in the industrial production of methanol. Catalysts made from copper (Cu) and zinc oxide (ZnO) on alumina supports are often used. However, the actual active sites for this reaction—Zn-Cu bimetallic sites or ZnO-Cu interfacial sites—are debated. Kattel et al.
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Catalysis The hydrogenation of carbon dioxide is a key step in the industrial production of methanol. Catalysts made from copper (Cu) and zinc oxide (ZnO) on alumina supports are often used. However, the actual active sites for this reaction—Zn-Cu bimetallic sites or ZnO-Cu interfacial sites—are debated. Kattel et al.
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Oxidation on Metal Oxide Surfaces
1968The redn. of transition metal oxides and of SnO2 + Sb2O3 by 1-butene and butadiene was investigated. A single parameter Qo, defined as the heat necessary to dissociate 0.5 O2 from the oxide, detd. the type of reaction. Starting from Q0 = 17 (MnO2) and proceeding to Q0 = 70 (SnO2), the redn. produces; CO2 -> (oxygenated products) -> butadiene ->
Simons, T.G.J. +3 more
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Monolithic Metal Oxide Transistors
ACS Nano, 2015We devised a simple transparent metal oxide thin film transistor architecture composed of only two component materials, an amorphous metal oxide and ion gel gate dielectric, which could be entirely assembled using room-temperature processes on a plastic substrate. The geometry cleverly takes advantage of the unique characteristics of the two components.
Yongsuk, Choi +6 more
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Parabolic oxidation of metals to metal deficit oxides
Oxidation of Metals, 1969A stepwise mechanism is outlined for diffusion-controlled oxidation of a metal Me to a metal deficit oxide Me3−zO, where z is the normal valence of Me in Me3−zO and may equal either 1 or 2. Specifically, oxidation is postulated to occur by (1) chemisorption of a singly ionized oxygen atom O− on the oxide surface with the concomitant formation of an ...
D. W. Bridges, W. M. Fassell
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Science, 2002
Metal oxidation is often unwanted--for example, in the case of corrosion--but under controlled conditions the oxidation of metals can be beneficial for the manufacture and performance of advanced materials9. In their Perspective, Over and Seitsonen provide a brief overview of the complex oxidation behavior of metal surfaces.
Over, H, Seitsonen, A P
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Metal oxidation is often unwanted--for example, in the case of corrosion--but under controlled conditions the oxidation of metals can be beneficial for the manufacture and performance of advanced materials9. In their Perspective, Over and Seitsonen provide a brief overview of the complex oxidation behavior of metal surfaces.
Over, H, Seitsonen, A P
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Metal oxide monolithic columns
Journal of Chromatography A, 2005Metal oxide monoliths composed of ZrO2 and HfO2 have been synthesized in situ inside capillary columns. The material shows globular-like structure and through pores. Capillary electrochromatography and capillary liquid chromatography were performed in a monolithic column with the HfO2 material. Separation of a simple sample mixture showed the potential
David C, Hoth +2 more
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Half-metallic transition metal oxides
Journal of Magnetism and Magnetic Materials, 2004Abstract We present an application of the self-interaction corrected local spin density approximation to study the electronic structure of half-metallic double perovskites Ba 2 FeMoO 6 , Ca 2 FeMoO 6 , Sr 2 FeMoO 6 , Ca 2 FeReO 6 , and charge order in Fe 3 O 4 .
Szotek, Z. +5 more
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Surface Metal-Oxide-Silicon-Oxide-Metal Picosecond Photodetector
1982Recently there has been increased effort on the development of high speed photodetectors with ultimate response time down to the picosecond range. We have recently implemented a metaloxide-silicon-oxide-metal junction photodetector having a surface structure as shown diagrammatically in Figure la [1].
S. Thaniyavarn, T. K. Gustafson
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Metal-catalyzed asymmetric oxidations
Medicinal Research Reviews, 1999Recent advances in enantioselective metal-catalyzed oxidations are presented. Two transformations are discussed in detail: (a) asymmetric Baeyer-Villiger reactions of racemic and prochiral cyclic ketones giving optically active lactones, and (b) sulfide oxidations affording enantiomerically enriched sulfoxides.
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Semiconducting transition metal oxides
Journal of Physics: Condensed Matter, 2015Open shell transition metal oxides are usually described as Mott or charge transfer insulators, which are often viewed as being disparate from semiconductors. Based on the premise that the presence of a correlated gap and semiconductivity are not mutually exclusive, this work reviews electronic structure calculations on the binary 3d oxides, so to ...
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