Some properties of silica-supported nickel catalysts

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dc.contributor.advisorLinder, Peter Wen_ZA
dc.contributor.authorFirer, Colinen_ZA
dc.date.accessioned2016-03-21T19:25:00Z
dc.date.available2016-03-21T19:25:00Z
dc.date.issued1970en_ZA
dc.description.abstractA literature survey has been made of earlier work on factors which have been found to influence the catalytic activity of supported metal catalysts. In particular an interaction has been shown to exist between the metal and its support in these catalysts. Two of the important factors which were shown to affect activity are the average metal crystallite size and the fraction of the metal present in a non-metallic form (for example as metal ions) in the catalyst. The earlier work consists almost exclusively of kinetic studies of heterogeneously catalyzed reactions. It is suggested that the conclusions are of a limited value owing to the widespread existence of the compensation effect, the fact that different test reactions may give contrasting results as to the relative activities of a series of catalysts and the belief that only a small fraction of the surface sites of a catalyst is generally involved in a given heterogeneous reaction. The work described in this thesis consists of an investigation of the effects of various factors on the isosteric heat of adsorption of an adsorbate per unit metal area on supported metal catalysts. The heat of adsorption per unit metal area provides a measure of the strength of the bond between the adsorbate and the surface atoms of the adsorbent. It was felt that this approach would give further insight into the factors affecting catalytic activity because the disadvantages, mentioned above, of kinetic studies would be eliminated.en_ZA
dc.identifier.apacitationFirer, C. (1970). <i>Some properties of silica-supported nickel catalysts</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/18112en_ZA
dc.identifier.chicagocitationFirer, Colin. <i>"Some properties of silica-supported nickel catalysts."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1970. http://hdl.handle.net/11427/18112en_ZA
dc.identifier.citationFirer, C. 1970. Some properties of silica-supported nickel catalysts. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Firer, Colin AB - A literature survey has been made of earlier work on factors which have been found to influence the catalytic activity of supported metal catalysts. In particular an interaction has been shown to exist between the metal and its support in these catalysts. Two of the important factors which were shown to affect activity are the average metal crystallite size and the fraction of the metal present in a non-metallic form (for example as metal ions) in the catalyst. The earlier work consists almost exclusively of kinetic studies of heterogeneously catalyzed reactions. It is suggested that the conclusions are of a limited value owing to the widespread existence of the compensation effect, the fact that different test reactions may give contrasting results as to the relative activities of a series of catalysts and the belief that only a small fraction of the surface sites of a catalyst is generally involved in a given heterogeneous reaction. The work described in this thesis consists of an investigation of the effects of various factors on the isosteric heat of adsorption of an adsorbate per unit metal area on supported metal catalysts. The heat of adsorption per unit metal area provides a measure of the strength of the bond between the adsorbate and the surface atoms of the adsorbent. It was felt that this approach would give further insight into the factors affecting catalytic activity because the disadvantages, mentioned above, of kinetic studies would be eliminated. DA - 1970 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1970 T1 - Some properties of silica-supported nickel catalysts TI - Some properties of silica-supported nickel catalysts UR - http://hdl.handle.net/11427/18112 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18112
dc.identifier.vancouvercitationFirer C. Some properties of silica-supported nickel catalysts. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1970 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18112en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemistryen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemistryen_ZA
dc.titleSome properties of silica-supported nickel catalystsen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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