Damien, Khoo Yiyuan
(2013)
Synthesis And Characterisation Of
Microporous Alpo-5 Molecular Sieves
Templated By Novel Imidazolium-Based
Structural Directing Agents.
Masters thesis, Universiti Sains Malaysia.
Abstract
Microporous aluminophosphate (AlPO) molecular sieves have been
successfully crystallised under hydrothermal and ionothermal syntheses. The former
approach engaged 3-(2,3-dihydroxypropyl)-1,2-dimethylimidazolium hydroxide,
[dhpdm]OH, as a new structure-directing agent (SDA). The ionothermal synthesis
was carried out by using 1-ethyl-2,3-dimethylimidazolium bromide, [edmim]Br
ionic liquid, as both solvent and structure-directing agent. Both methods were
investigated by optimising the synthesis conditions such as crystallisation time and
temperature and molar concentrations of SDA, P2O5/Al2O3 ratio and H2O in
precursor gels. The results obtained showed different morphologies of well-defined
AlPO-5 (AFI) crystals with AFI topology under different synthesis conditions.
Hydrothermal treatment using [dhpdm]OH produced crystals with column-strip,
aggregated hexagonal prism, hexagonal barrel and narrow cylindrical rod structures.
On the other hand, ionothermal treatment using [edmim]Br ionic liquid yielded
aggregated and spheroidal hexagonal thin-plate crystals.
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