Effect of templates on the synthesis of organized mesoporous alumina
Organized mesoporous materials represent a class of molecular sieves because of its high potential for commercial applications in adsorption and catalysis. In this study, organized mesoporous alumina was synthesized by the sol-gel method using various organic templates, i.e. cationic, neutral and an...
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| Format: | Article |
| Language: | English |
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Malaysian Society of Analytical Sciences
2007
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| Online Access: | http://eprints.utm.my/8149/1/ZRamli2007-_Effect_Of_Templates_On_The.pdf |
| _version_ | 1825910154817699840 |
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| author | Ramli, Zainab Chandren, Sheela |
| author_facet | Ramli, Zainab Chandren, Sheela |
| author_sort | Ramli, Zainab |
| collection | ePrints |
| description | Organized mesoporous materials represent a class of molecular sieves because of its high potential for commercial applications in adsorption and catalysis. In this study, organized mesoporous alumina was synthesized by the sol-gel method using various organic templates, i.e. cationic, neutral and anionic surfactants. Surface porosity of the synthesized aluminas obtained exhibit materials in the mesopore ranges. The morphology of the samples consists of wormhole-like mesostructure in the nano-region (20 – 70 nm). Sample with cetyl trimethylammonium bromide as cationic templates has the narrowest pore distribution centred at 8 nm as compared to samples synthesized with Triton X-114 (neutral) and stearic acid (anionic). All samples showed only Lewis acidity. Acidity and mesoporous character present in these mesoporous alumina samples showed that this material has potential as catalyst support and also used in Lewis acid catalyzed reactions. Study showed that the cationic surfactant is a better template to obtain uniform mesoporous alumina that might be due to the weak interaction between the template and the surface of the alumina.
Bahan berliangmeso teratur adalah mewakili kelas bahan penapis molekul kerana berpotensi tinggi dalam penggunaannya dalam penjerapan dan pemangkinan. Dalam kajian ini alumina berliangmeso teratur disintesis mengikut kaedah sol-gel menggunakan berbagai templat organik iaitu surfaktan bersifat kation, neutral dan anion. Keliangan permukaan alumina yang disintesis memperlihatlan bahan berada dalam julat berliangmeso. Morfologi sampel mengandungi strukturmeso berupa seperti ulat dalam julat nano (20 - 70 nm). Sampel dengan setil trimetilammonium bromida sebagai templat kation mempunyai taburan liang yang paling sempit berpusat di 8 nm berbanding dengan sampel yang disintesis dengan Triton X-114 (neutral) dan asid stearik (anion). Semua sampel menunjukkan hanya keasidan Lewis. Keasidan dan keliangan meso yang diberikan oleh sampel alumina menunjukkan yang bahan ini berpotensi sebagai penyokong mangkin dan berguna juga dalam tindak balas bermangkinkan asid Lewis. Kajian menunjukkan yang surfaktan kation adalah templat yang lebih baik untuk mendapatkan alumina berliangmeso yang seragam, berkemungkinan disebabkan oleh interaksi lemah templat dengan permukaan alumina |
| first_indexed | 2024-03-05T18:12:48Z |
| format | Article |
| id | utm.eprints-8149 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T18:12:48Z |
| publishDate | 2007 |
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| spelling | utm.eprints-81492012-11-19T05:08:50Z http://eprints.utm.my/8149/ Effect of templates on the synthesis of organized mesoporous alumina Ramli, Zainab Chandren, Sheela QD Chemistry Organized mesoporous materials represent a class of molecular sieves because of its high potential for commercial applications in adsorption and catalysis. In this study, organized mesoporous alumina was synthesized by the sol-gel method using various organic templates, i.e. cationic, neutral and anionic surfactants. Surface porosity of the synthesized aluminas obtained exhibit materials in the mesopore ranges. The morphology of the samples consists of wormhole-like mesostructure in the nano-region (20 – 70 nm). Sample with cetyl trimethylammonium bromide as cationic templates has the narrowest pore distribution centred at 8 nm as compared to samples synthesized with Triton X-114 (neutral) and stearic acid (anionic). All samples showed only Lewis acidity. Acidity and mesoporous character present in these mesoporous alumina samples showed that this material has potential as catalyst support and also used in Lewis acid catalyzed reactions. Study showed that the cationic surfactant is a better template to obtain uniform mesoporous alumina that might be due to the weak interaction between the template and the surface of the alumina. Bahan berliangmeso teratur adalah mewakili kelas bahan penapis molekul kerana berpotensi tinggi dalam penggunaannya dalam penjerapan dan pemangkinan. Dalam kajian ini alumina berliangmeso teratur disintesis mengikut kaedah sol-gel menggunakan berbagai templat organik iaitu surfaktan bersifat kation, neutral dan anion. Keliangan permukaan alumina yang disintesis memperlihatlan bahan berada dalam julat berliangmeso. Morfologi sampel mengandungi strukturmeso berupa seperti ulat dalam julat nano (20 - 70 nm). Sampel dengan setil trimetilammonium bromida sebagai templat kation mempunyai taburan liang yang paling sempit berpusat di 8 nm berbanding dengan sampel yang disintesis dengan Triton X-114 (neutral) dan asid stearik (anion). Semua sampel menunjukkan hanya keasidan Lewis. Keasidan dan keliangan meso yang diberikan oleh sampel alumina menunjukkan yang bahan ini berpotensi sebagai penyokong mangkin dan berguna juga dalam tindak balas bermangkinkan asid Lewis. Kajian menunjukkan yang surfaktan kation adalah templat yang lebih baik untuk mendapatkan alumina berliangmeso yang seragam, berkemungkinan disebabkan oleh interaksi lemah templat dengan permukaan alumina Malaysian Society of Analytical Sciences 2007 Article PeerReviewed application/pdf en http://eprints.utm.my/8149/1/ZRamli2007-_Effect_Of_Templates_On_The.pdf Ramli, Zainab and Chandren, Sheela (2007) Effect of templates on the synthesis of organized mesoporous alumina. The Malaysian Journal of Analytical Sciences, 11 (1). pp. 110-116. ISSN 1394-2506 http://www.ukm.my/mjas/v11_n1/17_28PC2-Zainab-adaBMAbs-1.pdf |
| spellingShingle | QD Chemistry Ramli, Zainab Chandren, Sheela Effect of templates on the synthesis of organized mesoporous alumina |
| title | Effect of templates on the synthesis of organized mesoporous alumina
|
| title_full | Effect of templates on the synthesis of organized mesoporous alumina
|
| title_fullStr | Effect of templates on the synthesis of organized mesoporous alumina
|
| title_full_unstemmed | Effect of templates on the synthesis of organized mesoporous alumina
|
| title_short | Effect of templates on the synthesis of organized mesoporous alumina
|
| title_sort | effect of templates on the synthesis of organized mesoporous alumina |
| topic | QD Chemistry |
| url | http://eprints.utm.my/8149/1/ZRamli2007-_Effect_Of_Templates_On_The.pdf |
| work_keys_str_mv | AT ramlizainab effectoftemplatesonthesynthesisoforganizedmesoporousalumina AT chandrensheela effectoftemplatesonthesynthesisoforganizedmesoporousalumina |