کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10245106 | 47713 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermolytic conversion of a bis(alkoxy)tris(siloxy)tantalum(V) single-source molecular precursor to catalytic tantala-silica materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Thermolytic conversion of a bis(alkoxy)tris(siloxy)tantalum(V) single-source molecular precursor to catalytic tantala-silica materials Thermolytic conversion of a bis(alkoxy)tris(siloxy)tantalum(V) single-source molecular precursor to catalytic tantala-silica materials](/preview/png/10245106.png)
چکیده انگلیسی
The new complex (iPrO)2Ta[OSi(OâtBu)3]3 (1) was prepared via silanolysis of Ta(OâiPr)5 with (tBuO)3SiOH and is a useful structural and spectroscopic (NMR, FTIR) model of Ta(V) on silica. The complex was also used to prepare tantalum-containing silica materials, via the thermolytic molecular precursor method (yielding Ta2O5Â â
 6SiO2 and Ta2O5 â
 18SiO2) or by grafting 1 onto mesoporous SBA-15 silica (yielding a surface-supported tantala species, TaSBA-15). The solution phase thermolysis of 1 in nonpolar media afforded homogeneous, high-surface-area (ca. 450 m2âgâ1) xerogels (Ta2O5 â
 6SiO2) that are amorphous up to approximately 1100â°C. A more silica-rich tantala-silica material (Ta2O5 â
 18SiO2) was prepared via a solution-phase co-thermolytic route with 1 and HOSi(OâtBu)3, to yield a material with a Si/Ta ratio of 9/1. It was demonstrated that tantala-silica materials are active as catalysts for cyclohexene oxidation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 229, Issue 1, 1 January 2005, Pages 72-81
Journal: Journal of Catalysis - Volume 229, Issue 1, 1 January 2005, Pages 72-81
نویسندگان
Richard L. Brutchey, Claus G. Lugmair, Lars O. Schebaum, T. Don Tilley,