کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
75952 | 49128 | 2009 | 5 صفحه PDF | دانلود رایگان |
The hydrothermally stable MCM-48 mesoporous molecular sieve was successfully prepared at extremely low cost of cetyltrimethylammonium bromide (CTAB) by carefully adjusting the synthesis conditions. The increasing of the crystallization temperature from 373 K to 423 K can dramatically reduce the CTAB surfactant amount for the preparation of MCM-48 from 0.65 to 0.1 of the CTAB/Si ratio. The effect of increasing crystallization temperature on the formation process of MCM-48 at low CTAB cost was carefully studied. The influences of OH−/Si ratio and fluoride addition to the structure stability of the MCM-48 material synthesized at CTAB/Si = 0.1 and 423 K were systematically studied by XRD patterns. Moreover, the combination of increasing crystallization temperature and adding small amount of fluoride ions can considerably improve the structure stability of MCM-48 when reducing the CTAB cost.
Journal: Microporous and Mesoporous Materials - Volume 122, Issues 1–3, 1 June 2009, Pages 229–233