AI Article Synopsis
- The gel skeletal reinforcement (GSR) method was used to create a new type of hierarchical catalyst from β-zeolite by adding a specific solution at the preparation stage.
- *The resulting catalyst featured a core-shell structure with microporous β-zeolite and mesoporous silica, which was analyzed using various characterization techniques.
- *During catalytic cracking tests with n-dodecane, it was discovered that higher mesopore volume and surface area led to increased catalytic activity, highlighting the benefit of mesopore incorporation.
Article Abstract
The gel skeletal reinforcement (GSR) method was applied at the preparation stage of β-zeolite to prepare a novel hierarchical catalyst. A solution of hexamethyldisiloxane (HMDS) and acetic anhydride, a GSR reagent, was added to the mixture of colloidal silica, sodium aluminate, tetraethylammonium hydroxide, sodium hydroxide and water, and successive aging and hydrothermal treatment gave microporous β-zeolite surrounded by mesoporous silica like core-shell structure. Its properties were characterized by XRD, nitrogen adsorption and desorption, NH-TPD, TEM, and TG-DTA measurements, and further characteristics of the catalysts produced were clarified by the catalytic cracking of n-dodecane. The hierarchical structure of microporous zeolite and mesoporous silica was shown from GSR-2.9HS-H-Beta to GSR-3.2HS-H-Beta, where the molar ratio of HMDS and silica source of β-zeolite was 2.9~3.2 : 100. It was found that in the catalytic cracking of n-dodecane, the relative activity (the conversion per the amount of zeolite crystals) increased with the increase in mesopore volume and surface area. The result indicated that the introduction of mesopores was effective even in catalytic cracking of small molecule of n-dodecane.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11639649 | PMC |
| http://dx.doi.org/10.1002/cplu.202400447 | DOI Listing |
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