Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties
Hierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.0...
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MDPI AG
2021-07-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/15/4508 |
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| author | Zeinab Mcheik Ludovic Pinard Joumana Toufaily Tayssir Hamieh T. Jean Daou |
| author_facet | Zeinab Mcheik Ludovic Pinard Joumana Toufaily Tayssir Hamieh T. Jean Daou |
| author_sort | Zeinab Mcheik |
| collection | DOAJ |
| description | Hierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.04 mol·L<sup>−1</sup>, amorphous materials are observed. These hierarchical mordenite possess a higher porous volume compared to its counterpart conventional micrometer crystals. Nitrogen sorption showed the presence of mesoporosity for all mordenite samples synthesized in the presence of CTAB. The creation of mesopores due to the presence of CTAB in the synthesis medium does not occur at the expense of zeolite micropores. In addition, mesoporous volume and BET surface seem to increase upon the increase of CTAB concentration in the synthesis medium. The Si/Al ratio of the zeolite framework can be increased from 5.5 to 9.1 by halving the aluminum content present in the synthesis gel. These synthesized hierarchical MOR-type zeolites possess an improved catalytic activity for <i>n</i>-hexane cracking compared to large zeolite crystals obtained in the absence of CTAB. |
| first_indexed | 2024-03-10T09:11:34Z |
| format | Article |
| id | doaj.art-e86a9dce0c6449b3a25330c795cfdb78 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T09:11:34Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-e86a9dce0c6449b3a25330c795cfdb782023-11-22T05:59:09ZengMDPI AGMolecules1420-30492021-07-012615450810.3390/molecules26154508Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic PropertiesZeinab Mcheik0Ludovic Pinard1Joumana Toufaily2Tayssir Hamieh3T. Jean Daou4Axe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR 7361, CNRS, University of Haute Alsace (UHA), F-68093 Mulhouse, FranceInstitut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285 CNRS, 4 Rue Michel Brunet, Bâtiment B27, CEDEX 09, 86073 Poitiers, FranceLaboratory of Materials, Catalysis, Environment and Analytical Methods Faculty of Sciences, Section I, Lebanese University Campus Rafic Hariri, Hadath, LebanonLaboratory of Materials, Catalysis, Environment and Analytical Methods Faculty of Sciences, Section I, Lebanese University Campus Rafic Hariri, Hadath, LebanonAxe Matériaux à Porosité Contrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M), UMR 7361, CNRS, University of Haute Alsace (UHA), F-68093 Mulhouse, FranceHierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.04 mol·L<sup>−1</sup>, amorphous materials are observed. These hierarchical mordenite possess a higher porous volume compared to its counterpart conventional micrometer crystals. Nitrogen sorption showed the presence of mesoporosity for all mordenite samples synthesized in the presence of CTAB. The creation of mesopores due to the presence of CTAB in the synthesis medium does not occur at the expense of zeolite micropores. In addition, mesoporous volume and BET surface seem to increase upon the increase of CTAB concentration in the synthesis medium. The Si/Al ratio of the zeolite framework can be increased from 5.5 to 9.1 by halving the aluminum content present in the synthesis gel. These synthesized hierarchical MOR-type zeolites possess an improved catalytic activity for <i>n</i>-hexane cracking compared to large zeolite crystals obtained in the absence of CTAB.https://www.mdpi.com/1420-3049/26/15/4508zeoliteshierarchical zeolitesmordenite<i>n</i>-hexane cracking |
| spellingShingle | Zeinab Mcheik Ludovic Pinard Joumana Toufaily Tayssir Hamieh T. Jean Daou Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties Molecules zeolites hierarchical zeolites mordenite <i>n</i>-hexane cracking |
| title | Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties |
| title_full | Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties |
| title_fullStr | Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties |
| title_full_unstemmed | Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties |
| title_short | Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties |
| title_sort | synthesis of hierarchical mor type zeolites with improved catalytic properties |
| topic | zeolites hierarchical zeolites mordenite <i>n</i>-hexane cracking |
| url | https://www.mdpi.com/1420-3049/26/15/4508 |
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