کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
69231 48534 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and characterization of a new epoxidation catalyst by grafting cis-MoO2(salpr) complex to functionalized MCM-41
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Synthesis and characterization of a new epoxidation catalyst by grafting cis-MoO2(salpr) complex to functionalized MCM-41
چکیده انگلیسی

The mesoporous molecular sieve MCM-41 was covalently grafted with 3-chloropropyl trimethoxylsilane and was then reacted with N,N′-bis(3-salicylidenaminopropyl)amine(salpr) to afford MCM-41 containing salpr ligand, salpr/Si-MCM-41. Powder X-ray diffraction and nitrogen adsorption–desorption analyses revealed that not only the textural characteristics of the support were preserved during the grafting experiments but also the channels remained accessible despite sequential reduction in surface area, pore volume and pore size. The salpr/Si-MCM-41 material was then reacted with MoO2(acac)2 to give MoO2(salpr)/Si-MCM-41 catalyst with molybdenum loading of 1.75 wt.%. The molybdenum-containing MCM-41 was shown to successfully catalyze the epoxidation of 1-hexene, 1-octene, cyclohexene and cyclooctene with tert-butylhydroperoxide (TBHP) quantitatively with 95–99% selectivity toward the corresponding epoxides under mild conditions.

Incorporation of a salpr schiff base ligand within the large pores of mesoporous material MCM-41 and subsequent treatment with MoO2(acac)2 affords a new truly heterogeneous molybdenum catalyst for successful epoxidation of cycooctene,cyclohexene,1-octene and 1-hehene with TBHP with high selectivities, turnover frequencies, and stability. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 243, Issue 2, 16 January 2006, Pages 170–175
نویسندگان
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