Synthesis And Characterisation Of Microporous Alpo-5 Molecular Sieves Templated By Novel Imidazolium-Based Structural Directing Agents

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.

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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.

Item Type: Thesis (Masters)
Subjects: Q Science > QD Chemistry > QD1-999 Chemistry
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Kimia (School of Chemical Engineering) > Thesis
Depositing User: Mr Mohammad Harish Sabri
Date Deposited: 23 Aug 2019 08:19
Last Modified: 23 Aug 2019 08:19
URI: http://eprints.usm.my/id/eprint/45265

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