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 20 of 64 for “"Ethene"”.
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Bulky cyclopentadienyl chromium complexes as ethene trimerisation catalyst precursors
The process of ethene trimerisation to 1-hexene, has recently attracted considerable interest, in light of the usefulness of 1-hexene industrially. In this project the process of catalytic ethene trimerisation, using bulky cyclopentad ienyl chromium complexes was investigated. Firstly, a series of …
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Development of new late transition metal catalysts for the oligomerisation of ethene
The oligomerisation of ethene to linear l-alkenes is an important industrial process. The recent discovery of iron and cobalt bisiminopyridyl and nickel and palladium a-diimine catalysts for the polymerisation and oligomerisation of l-alkenes has stimulated interest in the use of late transition …
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Evaluating the sustainability of monitored natural attenuation in groundwater at chlorinated ethene contaminated sites
… sites is the existence of a mature chlorinated ethene groundwater plume and the use of MNA as the long-term remediation strategy. Constituent specific NAC values were quantified and statistically examined to determine past performance of MNA at the sites. A conceptual decision model was …
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A Matrix Isolation Spectroscopic Investigation of the Reaction Products of Transition Metal Centres With Ethene and Water
… products of thermally generated atomic V with ethene and ethene isotopomers have been investigated by matrix isolation ultraviolet visible and Fourier transform infrared (FTIR) spectroscopy. When V is deposited into matrices of pure Ar, evidence for V and V2 are present in the UV-visible …
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Studies on conducting polymers : the synthesis and anodic electropolymerisation of novel B-functionalised thiophenes
… derivatives viz; trans-l,2-bis(3 ’-thienyl)ethene, [1]; trans-l-(l ‘-pyrenyl)-2-(3’’-thienyl)ethene, [2]; trans-l-(p-N,N-dimethylaminophenyl)-2-(3 ‘-thienyl)ethene, [3]; trans-l-(ferrocenyl)-2-(3 ‘-thienyl)ethene, [4]; (E,E)-3,4-bis-(2 ‘-ethenylferrocenyl)thiophene, [5]; l-(ferrocenyl)-3-(3 …
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Microbial Growth On Anthropogenic Compounds By Reductive Dehalogenation Or Oxidation
… these compounds and, in the case of tetrachloroethene (PCE), detoxify it by producing ethene. Its genome contains a putative prophage, which could inhibit its ability to grow to high densities and cause phage mediated cell death. This phage was evaluated by genomic comparisons and electron …
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Improvement of propylene yield via butene metathesis
… few years without the concomitant growth in the ethene demand, One of the technologies available is 1-butene metathesis, which describes a one-step process where isomerisation of 1-butene to 2-butene followed by cross-metathesis taking place. Products of the cross metathesis are propene and …
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Type 3 porous liquids: compressibility and gas and liquid separations
… of porous liquids to separate ethane and ethene. A range of porous solids selected according to their ability to adsorb ethane and ethene would be synthesized and characterized. Subsequently, formulated porous liquids were fully characterized and evaluated for their potential in …
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The Microbubble Assisted Bioremediation of Chlorinated Ethenes
… dehalogenate tetrachloroethylene all the way to ethene and ethane. A continuous flow system, consisting of six anaerobic soil column bioreactors, inoculated with sediments from Virginia Tech's Duck Pond, was used for this study. Two columns received microbubbles containing hydrogen and carbon …
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Cometabolic and Growth-Linked Biodegradation of Vinyl Chloride Under Aerobic Conditions
… manner, or cometabolize VC rapidly when grown on ethene or ethane.
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The Feasibility of Bioaugmentation for the Remediation of Chlorinated Solvents: A Microcosm Study
… to be capable of completely degrading PCE to ethene. The aqueous ethene concentration was monitored over time. It is clear from the results that bioaugmentation successfully increased the degree of reductive dechlorination over their static counterpart. Without innoculation, shallow static …
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Transition Metal Organosilicon Compounds, Activation of Si-H and Si-C Bonds by Organometallic Complexes
… (tmed) gives the tungsten ethene/hydride complex [Li(tmed)]3[WH(C 2H4)4].
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Isolation and Ecology of Bacterial Populations Involved in Reductive Dechlorination of Chlorinated Solvents
… complete reductive detoxification of chlorinated ethenes and are widely distributed in anoxic sediments and aquifers, including non-contaminated (pristine) environments. Careful examination of enrichment culture dechlorination kinetics, 16S rRNA gene based analyses, and reductive dehalogenase gene …
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Fundamental studies of mixed gas plasmas in ICP-MS
… proved unsuccessful. The addition of ethene to the nebulizer gas has been used to remove many of the polyatomic interferences encountered in ICP-MS, including those based on Na, S and P. Ethene addition was as effective as, and usually better than, the addition of both methane and …
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A Matrix Isolation Spectroscopic Investigation Into the Reaction Products of Vanadium Metal Atoms With Propene
… mechanism for the similar reaction involving ethene. The mechanistic identification of the hydrogenation of propene is shown as a generalization of the previous reaction involving ethene. Photochemistry of reactants and intermediates trapped in the matrix are investigated. Irradiation of …
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