Abstract
The mesoporous molecular sieves Al-MCM-41 with Si/Al ratio equal to 16, was synthesized under hydrothermal conditions using cetyltrimethylammonium bromide (CTMA+Br-) 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.
| Original language | English |
|---|---|
| Pages (from-to) | 343-355 |
| Number of pages | 13 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 81 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - 2005 Jun 6 |
Fingerprint
All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
Cite this
}
Synthesis of 2-acetyl-6-methoxynaphthalene using mesoporous SO 42-/Al-MCM-41 molecular sieves. / Selvaraj, M.; Lee, K.; Yoo, K. S.; Lee, Tai Gyu.
In: Microporous and Mesoporous Materials, Vol. 81, No. 1-3, 06.06.2005, p. 343-355.Research output: Contribution to journal › Article
TY - JOUR
T1 - Synthesis of 2-acetyl-6-methoxynaphthalene using mesoporous SO 42-/Al-MCM-41 molecular sieves
AU - Selvaraj, M.
AU - Lee, K.
AU - Yoo, K. S.
AU - Lee, Tai Gyu
PY - 2005/6/6
Y1 - 2005/6/6
N2 - The mesoporous molecular sieves Al-MCM-41 with Si/Al ratio equal to 16, was synthesized under hydrothermal conditions using cetyltrimethylammonium bromide (CTMA+Br-) 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.
AB - The mesoporous molecular sieves Al-MCM-41 with Si/Al ratio equal to 16, was synthesized under hydrothermal conditions using cetyltrimethylammonium bromide (CTMA+Br-) 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.
UR - http://www.scopus.com/inward/record.url?scp=18844442579&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=18844442579&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2005.02.017
DO - 10.1016/j.micromeso.2005.02.017
M3 - Article
AN - SCOPUS:18844442579
VL - 81
SP - 343
EP - 355
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
IS - 1-3
ER -