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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Studies on molecular Oxo and Imido complexes of the group 6 metals and supported chromium oxide polymerisation catalysts

Dyer, Philip William January 1993 (has links)
This thesis describes studies directed towards the preparation of bis (imido) complexes of the Group 6 metals containing olefin, phosphine, acetylene, and alkyl ligands with particular emphasis on their relationship with Group 4 bent metallocenes. The polymerisation mechanism of the Phillips catalyst (CrO(_3)/SiO(_2)) is examined using XPS (X-Ray Photoelectron Spectroscopy) and in situ mass spectroscopy. Chapter 1 highlights properties of some of the important ligand classes that are used throughout the remainder of this thesis. Chapter 2 describes a high yield one-pot synthesis of molybdenum bis (imido) complexes of the type Mo(NR')(NR")Cl(_2).DME. In addition a number of attempts to extend this strategy to other metals are described, including a novel synthesis of the chromium complex [Cr(_2)Cl(_9)] [NHEt(_3)](_3). Chapter 3 describes the synthesis, characterisation, and reactivity of the bis (imido) bis (phosphine) complexes Mo(NAr)(_2)(PMe(_3))(_2) and [Mo(N(^t)Bu)(µ-N(^t)Bu)(PMe(_3))](_2). Further studies on bis (imido) olefin complexes of the type Mo(NAr)(_2)(PMe(_3))2(η(^2)-C(_2)H (_2)) and Mo(N(^t)Bu)(_2)(PMe(_3))(η(^2)-C(_2)H(_4)) was undertaken and concentrated on their structural relationship to Group 4 metallocene species. Chapter 4 describes the preparation, structure, and reactivity of some bis (imido) acetylene complexes Mo(NR)(_2)(PMe(_3)) (PhC=CR’) (R= Ar, (^t)Bu; R'= Ph, H). Preparation of bis (imido) alkyls was undertaken in attempts to generate benzyne and alkylidene derivatives. Chapter 5 studies the Phillips polymerisation catalyst using XPS and mass spectroscopy. Model systems were used to probe reactive surface species their use reveals a number of features that are difficult to observe with the actual catalyst. Aspects of molecular chemistry have been examined which are believed to relate directly to the heterogeneous system allowing a possible polymerisation mechanism to be postulated. Chapter 6 gives experimental details for Chapters 2-5. Philip William Dyer (November 1993)
112

Experimental studies in the isomerism and structural variations in molybdenum and rhenium halo-compounds / Ian Robert Anderson.

Anderson, Ian Robert January 1968 (has links)
Includes bibliography. / 111 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1968
113

Kinetics of carbide dissolution in chromium + molybdenum steels during oxidation /

Susanto, Laurensius Benny. January 2004 (has links)
Thesis (Ph. D.)--University of New South Wales, 2004. / Also available online.
114

Experimental studies in the isomerism and structural variations in molybdenum and rhenium halo-compounds /

Anderson, Ian Robert. January 1968 (has links) (PDF)
Thesis (Ph.D.) -- University of Adelaide, Dept. of Physical and Inorganic Chemistry, 1968.s. / Includes bibliography.
115

Azotobacter vinelandii nitrogenase : role of the MoFe protein [alpha]-subunit histidine-195 residue in catalysis /

Kim, ChulHwan, January 1994 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 157-184). Also available via the Internet.
116

Oxidation stability and activity of bulk, supported and promoted molybdenum carbide catalysts for methane reforming

Darujati, Anna Rini Sekar, January 2005 (has links) (PDF)
Thesis (Ph.D.)--Washington State University. / Includes bibliographical references.
117

Molybdenum amounts in deficient and healthy plants and methods of detecting and correcting deficiencies.

Hagstrom, Gerow Richard, January 1964 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1964. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 115-122).
118

Characterization and investigation of molybdenum carbides on activated carbon as hydrogenation catalysts

Clark, Christopher H. January 2005 (has links)
Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains viii, 76 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 54-57).
119

Syntheses and reactivities of some organophosphine complexes of chromium, molybdenum, and manganese

Wong, Wai-Kwok. January 1978 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references.
120

The effects of molar flux, pressure, and product gases on the stability of molybdenum carbide during steam methane reforming

McCauley, Robert Lowry, January 2005 (has links) (PDF)
Thesis (M.S. in chemical engineering)--Washington State University, December 2005. / Includes bibliographical references.

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