Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite

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dc.contributor.advisorFletcher, Jacken_ZA
dc.contributor.advisorO'Connor, Cyril Ten_ZA
dc.contributor.advisorKojima, Masamien_ZA
dc.contributor.authorVan Niekerk, Milesen_ZA
dc.date.accessioned2016-10-20T03:38:54Z
dc.date.available2016-10-20T03:38:54Z
dc.date.issued1992en_ZA
dc.descriptionBibliography: pages 225-233.en_ZA
dc.description.abstractSAP0-34 and mordenite, catalysts with quite different pore structures, are known to be suitable for methanol conversion to light olefins and propene oligomerization to a distillate type product, respectively. In this study, these catalysts were modified in various ways and the effect of these modifications on the activity and selectivity of the above two reactions investigated. SAP0-34, a small-pore silicoaluminophosphate molecular sieve, is highly selective in the formation of ethene and propene from methanol, but deactivates rapidly due to coke formation. This catalyst was synthesized and modified in various ways in an attempt to increase the catalyst lifetime and selectivity to ethene. Mild hydrothermal conditions encountered during deep-bed calcination of SAP0-34 were found to increase the catalyst lifetime. A number of further modifications were made to this deep-bed calcined material in an attempt to increase further the lifetime of this material. These modifications were : (i) Silanization - in order to neutralize the acidity on the external surface of the crystallites and hence reduce pore-mouth blockage by coke species on the crystallite external surface; (ii) Steaming - to investigate the effect of more severe hydrothermal conditions than those encountered under deep-bed-calcination conditions; (iii) Acid site poisoning by ammonia - in an attempt to reduce the rate of coke formation which takes place readily on strong acid sites; (iv) Boron impregnation - in order to reduce the intercrystalline void volume and thereby sterically hinder the formation of bulky coke molecules within the SAP0-34 pores; (v) Acid and caustic treatments - in order to reduce the catalyst acidity and thereby limit the rate of the coke formation reaction.en_ZA
dc.identifier.apacitationVan Niekerk, M. (1992). <i>Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Catalysis Research. Retrieved from http://hdl.handle.net/11427/22223en_ZA
dc.identifier.chicagocitationVan Niekerk, Miles. <i>"Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Catalysis Research, 1992. http://hdl.handle.net/11427/22223en_ZA
dc.identifier.citationVan Niekerk, M. 1992. Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Van Niekerk, Miles AB - SAP0-34 and mordenite, catalysts with quite different pore structures, are known to be suitable for methanol conversion to light olefins and propene oligomerization to a distillate type product, respectively. In this study, these catalysts were modified in various ways and the effect of these modifications on the activity and selectivity of the above two reactions investigated. SAP0-34, a small-pore silicoaluminophosphate molecular sieve, is highly selective in the formation of ethene and propene from methanol, but deactivates rapidly due to coke formation. This catalyst was synthesized and modified in various ways in an attempt to increase the catalyst lifetime and selectivity to ethene. Mild hydrothermal conditions encountered during deep-bed calcination of SAP0-34 were found to increase the catalyst lifetime. A number of further modifications were made to this deep-bed calcined material in an attempt to increase further the lifetime of this material. These modifications were : (i) Silanization - in order to neutralize the acidity on the external surface of the crystallites and hence reduce pore-mouth blockage by coke species on the crystallite external surface; (ii) Steaming - to investigate the effect of more severe hydrothermal conditions than those encountered under deep-bed-calcination conditions; (iii) Acid site poisoning by ammonia - in an attempt to reduce the rate of coke formation which takes place readily on strong acid sites; (iv) Boron impregnation - in order to reduce the intercrystalline void volume and thereby sterically hinder the formation of bulky coke molecules within the SAP0-34 pores; (v) Acid and caustic treatments - in order to reduce the catalyst acidity and thereby limit the rate of the coke formation reaction. DA - 1992 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1992 T1 - Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite TI - Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite UR - http://hdl.handle.net/11427/22223 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22223
dc.identifier.vancouvercitationVan Niekerk M. Methanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordenite. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Catalysis Research, 1992 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22223en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Catalysis Researchen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherCatalysis Researchen_ZA
dc.titleMethanol conversion to olefins and propene oligomerization over modified SAPO-34 and dealuminated mordeniteen_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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