Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"Dehydration reactions"”.
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Dehydration Reactions in the Organic Solid State
Made available in DSpace on 2014-12-13T20:10:14Z (GMT). No. of bitstreams: 1 7804068.pdf: 8143118 bytes, checksum: 7d0ae49ea45529c2590e386ae1deed04 (MD5) Previous issue date: 1977
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Studies of an alkali impregnated cobalt-molybdate catalyst for the water-gas shift and the methanation reactions
… the water-gas shift, methanation, and ethanol dehydration reactions, we can make the following conclusions: 1. The cesium-impregnated "Aldridge" catalyst is highly active for the water-gas shift reaction under sulfur tolerant conditions. 2. The activity of this catalyst is strongly dependent …
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Síntese in situ da liga de FeCo altamente estável encapsulada em carbono a partir do etanol
… at temperatures of 400, 500, 600 and 700ºC. The reactions were studied by Gas Chromatography (GC), from gas aliquots collected at predetermined times. From the ethanol dehydrogenation and dehydration reactions, it is transformed into an encapsulated binder and, for comparative purposes, it is …
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Mapping, petrological and geochemical explorations of the Massabesic Gneiss Complex in New Hampshire
… melting episodes in which muscovite and biotite dehydration reactions contribute to magmas that the mobilize and accumulate to produce the migmatite and rock textures observed during the mapping phase of this project. Geochemically the metasedimentary rocks, the migmatites and granites have two …
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Intensive parameters of a sulfide and aluminosilicate-bearing granite, Hancock County, Maine
… reequilibration with a fluid at about 400°C. Dehydration reactions within the Ellsworth schist probably resulted in the release of metal bearing fluids from the Ellsworth schist and redeposition into the adjacent fine-grained granite.
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Fluid Budget of Metasedimentary Rocks from a Tertiary Accretionary Prism and Connections to Seismicity, Olympic Peninsula, Northwest Washington State
<p>Metamorphic dehydration reactions and fluid movement in accretionary prisms have been linked to the recently discovered episodic tremor and slip (ETS) earthquake events along subduction zones, but prior studies lack the detail to effectively test the hypothesis that fluid flow triggers ETS …
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Selective dehydration of polyols over solid acids and metal-acid bifunctional catalysts: Towards a catalytic toolbox for rational catalyst design
… of sorbitol to isosorbide). Both types of reactions are called dehydration reactions, as they lead to the removal of water. Since most polyols can undergo either reaction, and since either reaction may be desired for a given polyol in order to reach different products from the same reagent, …
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The Fraser Lakes Zone B U-Th-REE deposit and its host rocks : implications for pegmatite- and leucogranite-hosted U-Th-REE deposits in northern Saskatchewan, Canada
… to have formed by partial melting (via biotite-dehydration reactions) of U-, Th- and REE-enriched rocks similar to the Wollaston Group at depth. The melts migrated upwards to the emplacement level within and along major structural zones, including sheared fold limbs, metamorphic foliations, and …
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Base stable and basic ionic liquids for catalysis
… recovered but were unable to catalyse subsequent reactions.<br/><br/>Heterogenisation of [Pyrr1,4][NTf2]x[OiPr]1-x and [Pyrr1,4][NTf2]x[OH]1-x ionic liquids was achieved through the preparation of SILPS, gels, silica spheres. Heterogenisation of [P6,6,6,6][C8SO3]x[OiPr]1-x ionic liquids was …
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The study of the asymmetric synthesis of lignans
… of lignans by approaches such as Diels-Alder reactions, asymmetric alkylation reactions, and intramolecular oxidative coupling reactions. In addition to developing asymmetric synthetic methodologies for chiral lignans, an investigation of chirality in arylnaphthalene lignans which lack …
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Cucurbiturils, tetrahedral capsules, and porous systems: synthesis, functionalization, and applications
… as a nanoreactor for the realization of dehydration reactions in water for synthesis of nitrones. During the second year a new supramolecular system was developed capable of adsorbing a significant amount of carbon dioxide. This system was developed starting from the cucurbit[6]uril, …
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Almacenamiento de energía mediante ciclos termoquímicos de CaO
… storage systems based on the use of reversible reactions at high temperature using CaO. The work developed within the framework of this Thesis is focused on the use of the carbonation/calcination of CaO/CaCO3 and hydration/dehydration of CaO/Ca(OH)2 as energy storage systems in conventional …
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Investigation of Reactions Occurring in Municipal Solid Waste Residues
… (MSW) is generated in the U.S. Understanding the reactions occurring in waste during disposal, transport, and storage is important to move towards an integrated waste management strategy. Recently some landfills in the U.S. have been reported to exceed the regulatory temperature range, causing …
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Promotion of Heterogeneous Acid and Base Catalysts for Biomass Upgrading
… to be active for a wide variety of chemical reactions useful in converting bio-based substrates to existing and novel chemicals; however, the costly separations associated with homogeneous catalysts have necessitated the study of solids with similar properties to fulfill the same role. …
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Mechanistic studies of class II lanthipeptide synthetases and yeast surface display of lanthipeptide leader peptides
… bifunctional synthetase that catalyzes both dehydration and cyclization of the lanthipeptides. Its 30 substrate peptides (ProcAs) have a high level of conservation in the N-terminal leader region and hypervariability in the C-terminal core region. A chimeric peptide with a ProcA leader …
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Co-pyrolysis of torrefied biomass and coal : product evaluation and reaction modelling
… to the course of primary and secondary pyrolysis reactions being interwoven, clear limitations of knowledge still exist in the field of modelling, specifically for torrefied biomass. The aim of this thesis was to investigate the yields and composition of products derived during co-pyrolysis of …
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Mechanistic, Biochemical, and Theoretical Studies of Phototoxicity and Photobluing
… fate relates to O-transfer and H<sub>2</sub>O dehydration reactions for new insight to the biosynthesis of dihydrobenzofuran natural products.</p> <p>Chapter 3 discusses the selectivity of product formation by controlling the philicity of the reaction surface. Although silica surfaces have been …
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Simultaneous production of methanol and dimethylether from synthesis gas
… over a copper based catalyst and subsequent dehydration of methanol to DME over an acidic catalyst. Alternatively, DME can be produced in an one-step (direct) process using a hybrid (bifunctional) catalyst system that permits both methanol synthesis and dehydration in a single process unit. …