Solid particle erosion of ceramics

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dc.contributor.advisorAllen, Colinen_ZA
dc.contributor.authorWellman, R Gen_ZA
dc.date.accessioned2016-03-28T14:21:31Z
dc.date.available2016-03-28T14:21:31Z
dc.date.issued1993en_ZA
dc.description.abstractThe zeolite ZSM-5 is well-known for its unique intersecting channel system. This channel system has a great bearing on the shape-selective properties and the long life-times of ZSM-5. In this study, ZSM-5 was modified in various ways to eliminate the external acidity of the catalyst to further improve these properties, and the success and effects of these modifications were investigated primarily using temperature programmed desorption techniques. The internal surface of ZSM-5, a medium pore zeolite, plays a major role in the shape selective properties of this catalyst, due to the diffusional restrictions imposed by the channel system on bulky molecules. Even though the number of acid sites on the external surface is small compared to the total number of acid sites, these easily accessible and non-shape selective acid sites may provide a high turnover rate for non-shape selective reactions. Furthermore, the main cause of deactivation of ZSM-5 is thought to be the formation of polyaromatic molecules on the external surface, which block access to the channels of the catalyst.en_ZA
dc.identifier.apacitationWellman, R. G. (1993). <i>Solid particle erosion of ceramics</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering. Retrieved from http://hdl.handle.net/11427/18219en_ZA
dc.identifier.chicagocitationWellman, R G. <i>"Solid particle erosion of ceramics."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1993. http://hdl.handle.net/11427/18219en_ZA
dc.identifier.citationWellman, R. 1993. Solid particle erosion of ceramics. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Wellman, R G AB - The zeolite ZSM-5 is well-known for its unique intersecting channel system. This channel system has a great bearing on the shape-selective properties and the long life-times of ZSM-5. In this study, ZSM-5 was modified in various ways to eliminate the external acidity of the catalyst to further improve these properties, and the success and effects of these modifications were investigated primarily using temperature programmed desorption techniques. The internal surface of ZSM-5, a medium pore zeolite, plays a major role in the shape selective properties of this catalyst, due to the diffusional restrictions imposed by the channel system on bulky molecules. Even though the number of acid sites on the external surface is small compared to the total number of acid sites, these easily accessible and non-shape selective acid sites may provide a high turnover rate for non-shape selective reactions. Furthermore, the main cause of deactivation of ZSM-5 is thought to be the formation of polyaromatic molecules on the external surface, which block access to the channels of the catalyst. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - Solid particle erosion of ceramics TI - Solid particle erosion of ceramics UR - http://hdl.handle.net/11427/18219 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18219
dc.identifier.vancouvercitationWellman RG. Solid particle erosion of ceramics. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18219en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Materials Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMaterials Engineeringen_ZA
dc.subject.otherApplied Scienceen_ZA
dc.titleSolid particle erosion of ceramicsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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