کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5447778 1511762 2017 31 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Epoxidation of olefins using a novel synthesized tungsten dendritic catalyst
ترجمه فارسی عنوان
اپوکسی کردن الیفین ها با استفاده از یک کاتالیزور دندریتیک سنتز شده تنگستن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
In this work, we carry out the preparation and characterization of new dendritic catalyst from an oligomer polyhedral silsesquioxane core (POSS-DG2.0). This material was used in the immobilization of the [W(CO)3Br2(NCMe)2] complex for optimization of the synthesis of the new dendritic catalyst. To determine the reaction time, the temperature effect and the amount of groups anchored in the material (mmol), some parameters, such as equilibration time and adsorption isotherms were studied. After the optimization studies and with the intention of application in catalysis, the new catalytic macromolecule was prepared by reaction of the dendrimer with the organometallic complex. The new catalyst was characterized by elemental analysis, FTIR, 13C and 29Si NMR, SEM, EDS, DRX and TGA. The new catalytic macromolecule POSS-DG2.0-[W(CO)3Br2] was tested in the epoxidation of olefins and proved to be an active catalyst with conversion rates between 60 and 88% and high selectivity in the formation of epoxides. To the best of our knowledge, this study is the first that has reported the preparation of POSS-DG2.0-[W(CO)3Br2] for catalytic epoxidation of 1-octene, cyclooctene, (S)-limonene, cis-3-hexen-1-ol, trans-3-hexen-1-ol and styrene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 201, 1 November 2017, Pages 262-270
نویسندگان
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