Kin Man Ho. / Thesis (M.Ph.)--Chinese University of Hong Kong, 1988. / Bibliography: leaves 61-65.

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Three nickel based catalysts were prepared by the impregnation method (Ni/Al2O3 and Ni/SiO2) and co-precipitation method (Ni/ZnO). The catalysts were characterized by XRD, ICP-OES, BET-surface area and pore volume, SEM, TEM, TPR, NH3-TPD and in-situ XRD reduction. The catalytic activity of the catalysts in the liquid phase hydrogenation of octanal was studied at 110 °C and 50 bar. The effect of water as a co-feed on the catalytic activity of the catalysts was also investigated. Generally, all the catalysts were crystalline materials. The Ni/Al2O3 and Ni/ZnO catalysts contained NiO species that were “hard” to reduce, whereas the Ni/SiO2 catalyst was the easiest to reduce, according to the TPR and in-situ XRD reduction studies. The total acidity (μmol NH3/gcatal.) of the catalysts decreased in the following sequence: Ni/Al2O3 > Ni/ZnO > Ni/SiO2. The Ni/SiO2 and Ni/ZnO catalysts had intermediate and strong acidic sites, respectively, while the Ni/Al2O3 catalyst had weak-intermediate and strong acidic sites. The BET-surface area and pore volume of the catalysts decreased in the following order: Ni/Al2O3 > Ni/SiO2 > Ni/ZnO. The conversion of octanal for all the catalysts was ca. 90 %. The Ni/SiO2 and Ni/ZnO catalysts had octanol selectivities of over 99 % and the Ni/Al2O3 catalyst had 95 % octanol selectivity. The alumina support was observed to catalyze the formation of heavy products (C24 acetal, dioctyl ether and 2-hexyl-1-decanol). The water present in the feed poisoned the alumina sites that were responsible for the formation of heavy products thereby, making the catalyst more selective (> 99 %) to octanol. For the Ni/SiO2 catalyst the presence of water in the feed caused the octanal conversion to decrease with time-on-stream. The deactivation of the Ni/SiO2 catalyst, when water was used as a co-feed, was caused by the mechanical failure of the catalyst and also by the leaching of nickel metal during the reaction. / Thesis (M.Sc.)--University of KwaZulu-Natal, Durban, 2010.

Thesis (M.S.)--Rochester Institute of Technology, 2009. / Typescript. Includes bibliographical references (leaves 99-101).

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Kinetics of the Dissolution of Copper in Aqueous Aliphatic Amines. An investigation was made of the dissolution of copper metal in aqueous solutions of methyl, ethyl and n-butyl amine and ammonia, as well as in solutions of their aminium and ammonium ions, under oxygen pressure. Study of the kinetics of the dissolution was carried out over a wide range of concentrations. It was observed that there are two regions of oxygen pressure dependency of the rate. The range of oxygen pressure, where rate is independent of oxygen pressure, was investigated in detail. The rate process has been established to obey the relation R = [formula omitted] [k₂(A) + k₃ (AH⁻⁺)] for all the systems studied. A mechanism for the dissolution reaction has been proposed. Catalytic Reduction of Nickel Ion by Molecular Hydrogen. The rate of precipitation of nickel from salt solution by molecular hydrogen in the presence of catalyst has been investigated over a wide range of concentrations. The variables studied are concentration of nickel, hydrogen pressure, amount of catalyst, concentration of- hydrogen ion and temperature. The rate of reduction is found to obey an equation of the form: [formula omitted] = -k₁[S][PH₂]½[Ni⁺⁺] + k₂[S][H⁺] The activation energy is found to be 25±2 kcal/mol. The equilibrium constant k for the reaction Ni⁺⁺ H2 Ni° + H₂ ⇌ Nº + 2 H⁺ is found to be 4.65 x 10⁻⁶ atm⁻¹ at 140°C. / Applied Science, Faculty of / Mining Engineering, Keevil Institute of / Graduate

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 232-249).

Thesis (M.S.)--West Virginia University, 2010. / Title from document title page. Document formatted into pages; contains xiii, 130 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 125-129).