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 422 for “"hydrogenation"”.
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Catalytic hydrogenation using titanium complexes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1995.
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Asymmetric Transfer Hydrogenation of Secondary Allylic Alcohols
… tandem isomerization and asymmetric transfer hydrogenation reaction. This reaction is a one pot, two-step process, which utilizes the unique ability of a transition metal catalyst to effect a combined reduction of the C-C double bond and the carbonyl group in a selected class of secondary …
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Asymmetric hydrogenation catalysed by platinum and iridium
The enantioselective hydrogenation of α-ketoesters over supported platinum metal catalysts which have been modified by chiral molecules has been studied. The aim of this thesis was (a) to gain a greater understanding of the kinetics of asymmetric hydrogenation of methyl pyruvate (MeCOCOOMe) to …
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The hydrogenation of nitrobenzene over metal catalysts
The catalytic hydrogenation of nitrobenzene is an industrially important reaction used in the commercial production of aniline for use in the polyurethane industry. A mechanism for the reaction was first proposed by Haber in 1898 and has been widely accepted despite never being fully delineated. …
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Small Molecule Activation Using Transfer Hydrogenation Catalysts
… amount of acid was found to promote the hydrogenation of 1 to 1H(H). The rate of hydrogenation of 1 was found to be dependent on the identity of the acid. It was found that acids with a pKa three orders of magnitude more acidic than [Cp*Ir(H2)(TsDPEN)] + (pKa = 13.88 in MeCN) resulted in …
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Selective hydrogenation for industrial 1-hexene purification
Previous reports identified selective catalytic hydrogenation as a possible route to the purification of industrial 1-hexene streams. Even so, reported performance has been poor and, consequently, the principal aim of this study is to adjust operating conditions so as to improve process performance …
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Selective hydrogenation for industrial 1-hexene purification
Previous reports identified selective catalytic hydrogenation as a possible route to the purification of industrial 1-hexene streams. Even so, reported performance has been poor and, consequently, the principal aim of this study is to adjust operating conditions so as to improve process performance …
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The low pressure hydrogenation of Midlothian coal
… 1. Midlothian coal was 31.3 percent liquefied by hydrogenation at atmospheric pressure and 185°C after 72 hours of reaction in a tetralin vehicle and using stannous sulfide as a catalyst. 2. The liquid product of the hydrogenation of Midlothian coal consisted of approximately 50 percent light oil …
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Catalytic Hydrogenation and Hydrodesulfurization of Model Compounds
… dissertation describes two related studies on hydrogenation and hydrodesulfurization of heterocyclic S-containing compounds. Alkyl substituted thiophenes are promising candidates for hydrogen carriers as the dehydrogenation reactions are known to occur under mild conditions. Four types of …
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The high pressure hydrogenation of midlothian coal
The hydrogenation of coal to produce petroleum and petroleum products has been an accomplished fact for several years. The investigation in the United states has been carried to the point of constructing a full-scale plant to attempt to put the process on a commercial production basis. The volatile …
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Kinetics of ketone hydrogenation over supported Ru catalysts
… of y-valerolactone (GVL) via the aqueous phase hydrogenation of levulinic acid (LA) over supported Ru catalysts was carried out, in order to understand how to better design a hydrogenation catalyst for such biomass catalytic strategies. At temperatures representative of biomass processing, the …
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Alkene hydrogenation on reduced nickel A-zeolite catalysts.
The individual and competitive hydrogenation reactions of ethene, propene and isobutene over various nickel metal-loaded 4A zeolites have been investigated. The reaction kinetics were found to be similar to those found by other workers for alkene hydrogenation over pure nickel metal. Reactions were …
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Direct hydrogenation reactivity of high volatile bituminous coals
Includes bibliographical references.
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Selective catalytic hydrogenation for industrial 1-hexene purification
Linear alpha-olefins, including 1-hexene, are used mainly as co-monomers in the production of polymers. The very low tolerance of the polymerisation catalyst to highly unsaturated impurities makes removal of these impurities from the olefin feedstock crucial. In South Africa, linear alpha-olefins …
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Iron-Based Alloys as Catalysts for CO2 Hydrogenation
… An especially attractive use of CO2 is its hydrogenation to hydrocarbon fuels. If coupled with a source of renewably generated H2, this reaction could provide a source of carbon neutral energy that can be readily integrated with current infrastructure. This study looked at the performance of …
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Asymmetric hydrogenation of unfunctionalized trisubstituted and tetrasubstituted olefins
… reactive chiral catalyst for the asymmetric hydrogenation of aryl trisubstituted olefins was generated by combining the complex (EBTHI)MMe2 (EBTHI = ethylenebistetrahydroindenyl, M = Ti, Zr) with [PhMe2NH]+[(BC6F5)4]- under a hydrogen atmosphere. A number of unfunctionalized trisubstituted …
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Preparation, Separation, Characterization and Hydrogenation of Endohedral Metallofullerenes
… addresses the structural characterization and hydrogenation of EMFs. A family of novel large cage yttrium-based TNT EMFs Y₃N@C₂ₙ (n=40-44) was prepared, separated, and structurally characterized for the first time. The structure of Y₃N@C₂ₙ (n=40-44) is proposed by the experimental and …
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