Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst

Zeolite W (MER topology) is a very important zeolite in catalysis and separation industries but its synthesis requires the use of organic structure-directing agents (OSDAs) and long crystallization time. This project aims to synthesize and study the formation of nanosized zeolite W without organic s...

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Main Author:	Cheong, Ying Wai
Format:	Thesis
Language:	English
Published:	2021
Subjects:	QD1-999 Chemistry
Online Access:	http://eprints.usm.my/51840/1/CHEONG%20YING%20WAI.pdf
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spelling	my-usm-ep.518402022-03-08T07:12:35Z Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst 2021-03 Cheong, Ying Wai QD1-999 Chemistry Zeolite W (MER topology) is a very important zeolite in catalysis and separation industries but its synthesis requires the use of organic structure-directing agents (OSDAs) and long crystallization time. This project aims to synthesize and study the formation of nanosized zeolite W without organic structure-directing agent with shortened synthesis time while using it as heterogeneous catalyst for various base-catalyzed organic reactions. The first part focuses on studying the effect of the synthesis parameters such as heating temperature, reaction time and hydrogel chemical compositions on the crystallization behaviour of zeolite W. It is found that the synthesis parameters have significant impact on the crystallization rate, purity of the zeolite phase, particle size and morphology of the zeolite product. By tuning the synthesis parameters, zeolite W with four distinct morphologies (nanorods, wheatsheaf-like, bullet-like and prismatic) can be obtained. Further investigation into the relationship between different morphologies and their surface basicity found that the surface basicity is linearly proportional to the surface area of the zeolites. Next, the time-dependent study on the nucleation and crystal growth process of nanosized zeolite W synthesized with reactive bamboo leaves ash (BLA) was reported. Various spectroscopic, microscopic and analytical techniques are used to follow the whole crystallization process. The zeolite undergoes amorphous phase reorganization twice before the occurrence of nucleation, crystallization and crystal growth. The zeolite W obtained exhibit nanorods morphology and tend to assemble in parallel forming bulkier bundle-like secondary particles. Lastly, the synthesis of nanocrystalline zeolite W with hierarchical mesoporosity under microwave heating condition was discussed. 2021-03 Thesis http://eprints.usm.my/51840/ http://eprints.usm.my/51840/1/CHEONG%20YING%20WAI.pdf application/pdf en public phd doctoral Perpustakaan Hamzah Sendut Pusat Pengajian Sains Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	QD1-999 Chemistry
spellingShingle	QD1-999 Chemistry Cheong, Ying Wai Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
description	Zeolite W (MER topology) is a very important zeolite in catalysis and separation industries but its synthesis requires the use of organic structure-directing agents (OSDAs) and long crystallization time. This project aims to synthesize and study the formation of nanosized zeolite W without organic structure-directing agent with shortened synthesis time while using it as heterogeneous catalyst for various base-catalyzed organic reactions. The first part focuses on studying the effect of the synthesis parameters such as heating temperature, reaction time and hydrogel chemical compositions on the crystallization behaviour of zeolite W. It is found that the synthesis parameters have significant impact on the crystallization rate, purity of the zeolite phase, particle size and morphology of the zeolite product. By tuning the synthesis parameters, zeolite W with four distinct morphologies (nanorods, wheatsheaf-like, bullet-like and prismatic) can be obtained. Further investigation into the relationship between different morphologies and their surface basicity found that the surface basicity is linearly proportional to the surface area of the zeolites. Next, the time-dependent study on the nucleation and crystal growth process of nanosized zeolite W synthesized with reactive bamboo leaves ash (BLA) was reported. Various spectroscopic, microscopic and analytical techniques are used to follow the whole crystallization process. The zeolite undergoes amorphous phase reorganization twice before the occurrence of nucleation, crystallization and crystal growth. The zeolite W obtained exhibit nanorods morphology and tend to assemble in parallel forming bulkier bundle-like secondary particles. Lastly, the synthesis of nanocrystalline zeolite W with hierarchical mesoporosity under microwave heating condition was discussed.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Cheong, Ying Wai
author_facet	Cheong, Ying Wai
author_sort	Cheong, Ying Wai
title	Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
title_short	Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
title_full	Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
title_fullStr	Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
title_full_unstemmed	Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst
title_sort	synthesis, formation and characterization of nanoscale zeolite type w base catalyst
granting_institution	Perpustakaan Hamzah Sendut
granting_department	Pusat Pengajian Sains Kimia
publishDate	2021
url	http://eprints.usm.my/51840/1/CHEONG%20YING%20WAI.pdf
_version_	1747822105390481408

Synthesis, Formation And Characterization Of Nanoscale Zeolite Type W Base Catalyst

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