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 A1PO<SUB>4</SUB>-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.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:649801 |
| Date | January 1995 |
| Creators | Dunlop, Alister Andrew |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/13741 |
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