Tertiary butylation of phenol over hexagonal p6mm mesoporous aluminosilicates with enhanced acidity

✍ Scribed by Jiahui Huang; Lihong Xing; Hongsu Wang; Gong Li; Shujie Wu; Tonghao Wu; Qiubin Kan

• Book ID: 103834478
• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 489 KB
• Volume: 259
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2006.06.001

✦ Synopsis

Through a two-step crystallization procedure and using cetyltrimethylammonium bromide (CTAB) as template, hexagonal p6mm mesoporous aluminosilicates (denoted as MB41) with n Si /n Al ratios from 15 to 50 have been assembled from the preformed zeolite Beta precursors under alkaline conditions. MB41 materials were characterized by powder XRD, N 2 adsorption-desorption, 27 Al-MAS NMR and pyridine adsorbed FT-IR spectroscopy techniques. Results obtained show that they are highly ordered hexagonal symmetry, and Al atoms are in tetrahedral coordination. Compared with classic Al-MCM-41, MB41 materials have stronger acidity, and also show significantly higher activities in the alkylation reaction of phenol with tert-butanol. At the reaction temperature of 145 • C, phenol conversion of 85.7% and 2,4-DTBP selectivity of 43.1% over MB41(25) are observed, but these over Al-MCM-41(25) are only 61.3% and 13.2%, respectively.