کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617809 | 49174 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Highly selective synthesis of trans-stilbene oxide over mesoporous Mn-MCM-41 and Zr-Mn-MCM-41 molecular sieves
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
trans-Stilbene oxide have been synthesized under liquid phase reaction conditions using trans-stilbene in the presence of different oxidants and different solvents over synthesized and characterized Zr-Mn-MCM-41 and Mn-MCM-41 as catalysts. On increasing the Si/(Zr + Mn) ratios of Zr-Mn-MCM-41 and Si/Mn ratios of Mn-MCM-41 catalysts from 49 to 327 and 15 to 102, respectively, the conversion of trans-stilbene, yield and selectivity of trans-stilbene oxide decreased. This may be due to the number of Lewis acid sites in Zr-Mn-MCM-41 and Mn-MCM-41 are found to decrease almost linearly with increasing ratios of Si/(Zr + Mn) and Si/Mn, respectively. Both the Zr-Mn-MCM-41(49) and Mn-MCM-41(31) possesses stronger affinity with trans-stilbene and TBHP, but, the conversion of trans-stilbene, yield and selectivity of trans-stilbene oxide decreased in only recyclable Mn-MCM-41. This may be due to decreasing the catalytic activity on the surface of catalysts. In the context, the Si/(Zr + Mn) ratio of 49 is found to be more suitable for the epoxidation of trans-stilbene to highly selective synthesis of trans-stilbene oxide. Thus the yield (76.3%) and selectivity of trans-stilbene oxide (84.58%) are higher in Zr-Mn-MCM-41(49) than that in other Zr-Mn-MCM-41 and Mn-MCM-41 catalysts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 79, Issues 1â3, 1 April 2005, Pages 261-268
Journal: Microporous and Mesoporous Materials - Volume 79, Issues 1â3, 1 April 2005, Pages 261-268
نویسندگان
M. Selvaraj, K.S. Seshadri, A. Pandurangan, T.G. Lee,