The deactivation of silico-aluminophosphate catalysts during methanol conversion reactions

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dc.contributor.authorCornel, Veronica May
dc.date.accessioned2018-04-05T10:52:41Z
dc.date.available2018-04-05T10:52:41Z
dc.date.issued1993
dc.descriptionA dissertation submitted to the Faculty of Science, University of the Wtlwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Scienceen_ZA
dc.description.abstractThis dissertation focusses on the deactivation of SAP0-34 and modified SAPOs during methanol conversion under various conditions, in comparison to H-ZSM-5. SAPO-34 was found to deactivate rapidly during methanol conversdon. This was shown by the decrease in activity, surface area and pore volume of the catalyst. The deposited "coke" was analysed by in situ diffuse reflectance infra-red Fourier Transform spectroscopy,solid-state magic angle spinning nuclear magnetic resonance, gas chromatography mass spectroscopy (GCMS) of the HF- and dichloromethane-extracted to "coke"; and GCMS of the organic specfes released during regeneration of the catalyst and trapped in resin capillary inlet tubes.The "coke" consisted of alkylated aromatics and naphthalenes which probably formed on the surface or in the large cavities of SAPO-34. The amount of "coke" deposited during methanol conversion increased with reaction temperature, decreased with dilution of the methanol with water or nitrogen. and decreased with increased pressure, Incorporation of Ni into the SAPO framework did not decrease the rate of deactivation, but the "coke" that Has deposited was less bulky than that deposited in SAPO-34. Modification of the SAPO-34 with trlmethyl silylchloride decreased the rate at deactivation of the catalyst.en_ZA
dc.description.librarianAC 2018en_ZA
dc.identifier.urihttps://hdl.handle.net/10539/24277
dc.language.isoenen_ZA
dc.subjectCatalysisen_ZA
dc.subjectChemistry, Physical and theoreticalen_ZA
dc.subjectCatalyst poisoning.en_ZA
dc.subjectMethanolen_ZA
dc.titleThe deactivation of silico-aluminophosphate catalysts during methanol conversion reactionsen_ZA
dc.typeThesisen_ZA
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