کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
68609 48518 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Al-MCM-41 as an efficient heterogeneous catalyst in the acetalization of cyclohexanone with methanol, ethylene glycol and pentaerythritol
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Al-MCM-41 as an efficient heterogeneous catalyst in the acetalization of cyclohexanone with methanol, ethylene glycol and pentaerythritol
چکیده انگلیسی

Mesoporous Al-MCM-41 molecular sieves in the Si/Al ratios 25, 50, 75 and 100 were synthesized under hydrothermal condition. They were characterised using powder X-ray diffraction (XRD), FT-IR and BET surface area analyser. The catalytic activity of these materials was tested for the slurry phase acetalization of cyclohexanone with methanol (MET), ethylene glycol (EG) and pentaerythritol (PEN) at 40–120 °C. MET conversion was found to be higher than that of EG and PEN. Hydrophobic property of catalyst and alcohols and also the steric properties of alcohols were suggested to play an important role in the acetalization. For MET and EG, Al-MCM-41 (100) was found to be more active than other catalyst but for PEN, Al-MCM-41 (25) was found to be more active. The reaction was also studied over H3PW12O40 supported MCM-41, commercially available heteropolyacid (H3PW12O40·nH2O) and zeolites (HM, Hβ and ZSM-5). Zeolites showed less activity for EG, PEN but comparable activity to MET. The requirement of Brönsted acid sites for the reaction was clearly established by running the reaction in the absence of catalyst.

Mesoporous Al-MCM-41 molecular sieves in the Si/Al ratios 25, 50, 75 and 100 were synthesized under hydrothermal condition. The catalytic activity of these materials was tested for the slurry phase acetalization of cyclohexanone with methanol (MET), ethylene glycol (EG) and pentaerythritol (PEN) at 40–120 °C. This process is an efficient, clean, economic and solvent less technique, inconstrast to conventional method, where the standard conditions for acetalization often fail for diaryl ketones, making the desired compounds available only via indirect routes. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 256, Issues 1–2, 18 August 2006, Pages 184–192
نویسندگان
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