Cubic Pm3n mesoporous aluminosilicates assembled from zeolite seeds as strong acidic catalysts
| Autor: | Ming-Chang Liu, Chi-Shuang Chang, Chia-Han Chen, Tsung-Han Lin, Soofin Cheng, Shing-Jong Huang |
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| Rok vydání: | 2015 |
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| Zdroj: | Catalysis Science & Technology. 5:3182-3193 |
| ISSN: | 2044-4761 2044-4753 |
| DOI: | 10.1039/c5cy00184f |
| Popis: | Cubic Pm3n mesoporous aluminosilicates isomorphous to SBA-1, with 3D interconnected pore structures, were assembled from Al-incorporating zeolite seeds at around pH 9 using cetyltriethylammonium bromide as a pore-directing agent. The resultant series of materials (termed Al–ZSBA-1) has the advantages of strong acidity from the zeolitic structure and good diffusivity of bulky reactants from the 3D interconnected mesopores. Al–ZSBA-1, with Al loading up to an Al/Si molar ratio of 0.057, still retains a cubic Pm3n structure and high surface area (ca. 600 m2 g−1). The acidities were stronger than the counter materials prepared using sodium silicate as the silica source (referred to as Al–SBA-1-alk). Moreover, all the Al(III) ions in Al–ZSBA-1 retained their tetrahedral coordination after calcination at 823 K, while a portion of Al(III) in Al–SBA-1-alk became octahedrally coordinated. When tested for the catalytic alkylation of 2,4-di-tert-butylphenol with cinnamyl alcohol, Al–ZSBA-1 gave higher flavan selectivities and yields in comparison to Al–SBA-1-alk, ZSM-5, and beta zeolites. |
| Databáze: | OpenAIRE |
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