Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production

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dc.contributor.advisorVan Steen, Ericen_ZA
dc.contributor.authorFung, Wing-Kinen_ZA
dc.date.accessioned2016-08-11T09:49:08Z
dc.date.available2016-08-11T09:49:08Z
dc.date.issued2012en_ZA
dc.description.abstractAmmonia oxidation is used in the production of nitric acid. The process is either run at high pressure or low pressure, with the latter requiring larger equipment. Platinum gauze is typically used as a catalyst operating at high temperatures (in the range of 810-940 ᵒC). The platinum based catalyst is highly active and highly selective in producing the desired NOₓ products, with some formation of the undesired byproducts, i.e. N₂, N₂O and N₂O₄. However, a significant amount of platinum is lost during the process due to platinum volatilisation resulting in plant operating times varying between 2-12 months. Furthermore, the loss of platinum is the 2nd largest expense of the operation. Platinum loss can only be minimised but not eliminated, thus a variety of metal oxide catalysts for oxidation of ammonia to nitrogen oxides have been studied. Cobalt oxide seems to be the most promising alternative for platinum exhibiting a high activity and selectivity towards NO. The aim of this study is to explore the use of a supported cobalt Co₃O₄ on silica catalyst for ammonia oxidation and compare some of the results with a commercial catalyst consisting of a pure, unsupported Co₃O₄.en_ZA
dc.identifier.apacitationFung, W. (2012). <i>Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering. Retrieved from http://hdl.handle.net/11427/21175en_ZA
dc.identifier.chicagocitationFung, Wing-Kin. <i>"Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2012. http://hdl.handle.net/11427/21175en_ZA
dc.identifier.citationFung, W. 2012. Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Fung, Wing-Kin AB - Ammonia oxidation is used in the production of nitric acid. The process is either run at high pressure or low pressure, with the latter requiring larger equipment. Platinum gauze is typically used as a catalyst operating at high temperatures (in the range of 810-940 ᵒC). The platinum based catalyst is highly active and highly selective in producing the desired NOₓ products, with some formation of the undesired byproducts, i.e. N₂, N₂O and N₂O₄. However, a significant amount of platinum is lost during the process due to platinum volatilisation resulting in plant operating times varying between 2-12 months. Furthermore, the loss of platinum is the 2nd largest expense of the operation. Platinum loss can only be minimised but not eliminated, thus a variety of metal oxide catalysts for oxidation of ammonia to nitrogen oxides have been studied. Cobalt oxide seems to be the most promising alternative for platinum exhibiting a high activity and selectivity towards NO. The aim of this study is to explore the use of a supported cobalt Co₃O₄ on silica catalyst for ammonia oxidation and compare some of the results with a commercial catalyst consisting of a pure, unsupported Co₃O₄. DA - 2012 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 T1 - Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production TI - Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production UR - http://hdl.handle.net/11427/21175 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21175
dc.identifier.vancouvercitationFung W. Low pressure ammonia oxidation over supported cobalt catalyst for nitric acid production. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Chemical Engineering, 2012 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21175en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Chemical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherChemical Engineeringen_ZA
dc.titleLow pressure ammonia oxidation over supported cobalt catalyst for nitric acid productionen_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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