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Title: Studies on synthesis, stability and dye incorporation into large pore molecular sieves
Author: Dunlop, Alister Andrew
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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The work described in this thesis is concerned with the synthesis, stability and dye incorporation into large pore molecular sieves, in particular looking at the ultra-large pore aluminophosphate molecular sieve VPI-5. The synthesis of VPI-5 was carried out with two types of system: i) Gels templated with the amine di-n-propylamine; ii) A clear solution "organic-free" system using a water soluble aluminium phosphate hydrochloride ethanolate (APHE) precursor. High purity yields of VPI-5 were obtained by optimisation of both systems. Analysis of the products produced by the different synthesis routes gave evidence that the aluminophosphate H1 and VPI-5 are very closely related. By the addition of polyethylene glycol to APHE systems large single crystals (10-20 μm wide by 250-1000 μm long) of VIP-5 synthesised for single crystal X-ray diffraction studies. The thermal stability of VPI-5 was thoroughly investigated and the apparent activation energy for the conversion of VPI-5 (synthesised with d-n-propylamine) to A1PO4-8. Encapsulation of dye within VPI-5 was shown to be capable of increasing the photostability of the dye. Dye sorption into faujasite materials with differing Si/Al ratios was investigated. It was found that a water sensitive solvatochromic complex was formed when the dye waxoline yellow RPFW was sorbed into the hydrogen form of dealuminated zeolite Y.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available