کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617728 | 49186 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis of 2-acetyl-6-methoxynaphthalene using mesoporous SO42-/Al-MCM-41 molecular sieves
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synthesis of 2-acetyl-6-methoxynaphthalene using mesoporous SO42-/Al-MCM-41 molecular sieves Synthesis of 2-acetyl-6-methoxynaphthalene using mesoporous SO42-/Al-MCM-41 molecular sieves](/preview/png/9617728.png)
چکیده انگلیسی
The mesoporous molecular sieves Al-MCM-41 with Si/Al ratio equal to 16, was synthesized under hydrothermal conditions using cetyltrimethylammonium bromide (CTMA+Brâ) as surfactant. The SO42-/Al-MCM-41(Si/Al = 16) material was synthesized using sulfuric acid under impregnation method, and the resulting material is sulfated Al-MCM-41 (SO42-/Al-MCM-41). The mesoporous materials viz. Al-MCM-41 and SO42-/Al-MCM-41 were characterized using several techniques e.g. ICP-AES, Nephelometer, XRD, FT-IR, TG/DTA, N2-adsorption, solid-state-NMR, SEM, TEM and TPD-pyridine. By impregnating of sulfuric acid on silica surface, crystallinity, surface area, pore diameter and pore volume of SO42-/Al-MCM-41 decreased except wall thickness. While the Lewis acidity is increased because of the expelling aluminum from the Al-MCM-41 framework by impregnating sulfuric acid. The SO42-/Al-MCM-41 has been used for synthesis of 2-acetyl-6-methoxynaphthalene using 2-methoxynaphthalene with acetic anhydride as acylating agent and 1,2-dichloroethane as solvent. The catalytic results were compared with those obtained using 0.8 N sulfuric acid, amorphous silica-alumina, H-β, USY and H-ZSM-5 zeolites. From the catalytic results it was concluded that the conversion of 2-methoxynaphthalene and selectivity of 2-acetyl-6-methoxynaphthalene in the SO42-/Al-MCM-41 is higher than that in other catalysts due to higher number of Lewis acid sites. Thus the SO42-/Al-MCM-41 is found to be a highly active and recyclable heterogeneous catalyst while the catalyst is a very suitable for the synthesis of 2-acetyl-6-methoxynaphthalene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 81, Issues 1â3, 6 June 2005, Pages 343-355
Journal: Microporous and Mesoporous Materials - Volume 81, Issues 1â3, 6 June 2005, Pages 343-355
نویسندگان
M. Selvaraj, K. Lee, K.S. Yoo, T.G. Lee,