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Title: The synthesis of aluminophosphate and silica molecular sieves
Author: Franklin, Keith Campbell
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1993
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The work described in this thesis is concerned with the synthesis of aluminophosphate and silica molecular sieves, in particular, the search for novel large pore materials. Reactions were studied systematically under a range of conditions and, to assist in this, a new type of reaction vessel was designed and fabricated. In the aluminophosphate system, a novel synthetic method using a water soluble aluminium phosphate hydrochloride ethanolate precursor is described. This provides a new synthesis route to the ultra-wide pore aluminophosphate molecular sieve VPI-5, without the use of quaternary ammonium compounds or amines. Aluminophosphates H2, H3 and H4 can also be synthesised using this method, and the relationship between AlPO4-H1 and VPI-5 is discussed. Further work on the aluminophosphate system has resulted in the synthesis of two new piperazine aluminophosphate materials, EA-5 and EA-6. EA-6 has been analysed by single crystal diffraction and found to possess a layered structure. Studies were also carried out on related heterocyclic organic compounds in an aluminophosphate synthesis gel. This resulted in the crystallisation of known materials, and a further phase not yet identified. In the silica system, the use of dual templates has been investigated using trioxane in combination with a variety of other organic compounds. In these experiments, the structure directing power of trioxane in the presence of Na+ is clearly demonstrated. A single crystal study of trioxane silica sodalite has also been carried out and the synthesis of a sodium-free synthesis of silica sodalite is described for the first time.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available