| Al-MCM-48分子筛对苯酚与乙酸异丙酯异丙基化反应的催化性能(英文) |
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| 作者姓名： | Kandan VENKATACHALAM Pitchai VISUVAMITHIRAN Balachandran SUNDARAVEL Muthiapillai PALANICHAMY Velayutham MURUGESAN |
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| 作者单位： | Department of Chemistry, Anna University |
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| 基金项目： | the financial support from the Department of Science and Technology (Sanction No. SR/S1/PC-10/2009, Dated 28.10.2009);University Grants Commission (UGC), New Delhi for providing funds under special assistance - DRS programme and Department of Science and Technology, New Delhi, under FIST programme for equipment facilities in the Department |
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| 摘 要： | Al-MCM-48 molecular sieves (Si/Al molar ratios = 25, 50, 75, and 100) were synthesized hydrothermally using cetyltrimethyl-ammonium bromide as the structure directing template. The orderly arrangement of mesopores was evident from the low angle X-ray diffraction patterns and transmission electron microscopy images. The catalytic performance of the materials was evaluated in the vapor phase isopropylation of phenol with isopropyl acetate. Phenol conversion decreased with the increase in the Si/Al ratio of the catalysts. The major reaction product was 4-isopropyl phenol with 78% selectivity. The delocalization of phenolic oxygen electron pair over the aromatic ring promoted para-selective alkylation. Such delocalization could be aided by the hydrophilic surface of the molecular sieves. Although an ester was used as the alkylating agent, phenyl isopropyl ether was not formed in the reaction.
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| 关 键 词： | Al-MCM-48 alkylation phenol isopropyl acetate 4-isopropyl phenol |
Catalytic Performance of Al-MCM-48 Molecular Sieves for Isopropylation of Phenol with Isopropyl Acetate |
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| Kandan VENKATACHALAM,Pitchai VISUVAMITHIRAN,Balachandran SUNDARAVEL,Muthiapillai PALANICHAMY,Velayutham MURUGESAN.Catalytic Performance of Al-MCM-48 Molecular Sieves for Isopropylation of Phenol with Isopropyl Acetate[J].Chinese Journal of Catalysis,2012(3):478-486. |
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| Authors: | Kandan VENKATACHALAM Pitchai VISUVAMITHIRAN Balachandran SUNDARAVEL Muthiapillai PALANICHAMY Velayutham MURUGESAN |
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| Institution: | * Department of Chemistry, Anna University, Chennai 600 025, India |
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| Abstract: | Al-MCM-48 molecular sieves (Si/Al molar ratios = 25, 50, 75, and 100) were synthesized hydrothermally using cetyltrimethyl-ammonium bromide as the structure directing template. The orderly arrangement of mesopores was evident from the low angle X-ray diffraction patterns and transmission electron microscopy images. The catalytic performance of the materials was evaluated in the vapor phase isopropylation of phenol with isopropyl acetate. Phenol conversion decreased with the increase in the Si/Al ratio of the catalysts. The major reaction product was 4-isopropyl phenol with 78% selectivity. The delocalization of phenolic oxygen electron pair over the aromatic ring promoted para-selective alkylation. Such delocalization could be aided by the hydrophilic surface of the molecular sieves. Although an ester was used as the alkylating agent, phenyl isopropyl ether was not formed in the reaction. |
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| Keywords: | Al-MCM-48 alkylation phenol isopropyl acetate 4-isopropyl phenol |
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