Synthesis And Characterisation Of Microporous Alpo-5 Molecular Sieves Templated By Novel Imidazolium-Based Structural Directing Agents
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Date
2013-08
Authors
Damien Khoo, Yiyuan
Journal Title
Journal ISSN
Volume Title
Publisher
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.
Description
Keywords
Microporous Alpo-5 Molecular Sieves Templated , Novel Imidazolium