کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
74704 49098 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Incorporation of titanium into polymorph C for catalytic epoxidation of cyclohexene
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Incorporation of titanium into polymorph C for catalytic epoxidation of cyclohexene
چکیده انگلیسی

Incorporation of titanium into the framework of polymorph C of zeolite beta was attempted in a hydrothermal system using different titanium precursors of various contents in the synthesis gel. Samples were characterized using X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), inductive-coupled plasma-atomic emission spectrometer (ICP-AES), X-ray photoelectron spectroscope (XPS), and X-ray absorption near edge structure (XANES) techniques. Characterization results revealed that the incorporation of titanium into the framework of polymorph C can be achieved using Ti(NH4)2F6 as the titanium precursor without significantly affecting the crystalline structure of polymorph C. The sample synthesized with a Si/Ti molar ratio of 20 was found to possess the highest catalytic activity while the sample synthesized with a Si/Ti molar ratio of 5 was observed to display the highest selectivity in the epoxidation of cyclohexene.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 124, Issues 1–3, August–September 2009, Pages 36–41
نویسندگان
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