کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10239244 | 46053 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vapor-phase Beckmann rearrangement of cyclohexanone oxime over H3PO4/ZrO2-TiO2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Vapor-phase Beckmann rearrangement of cyclohexanone oxime over H3PO4/ZrO2-TiO2 Vapor-phase Beckmann rearrangement of cyclohexanone oxime over H3PO4/ZrO2-TiO2](/preview/png/10239244.png)
چکیده انگلیسی
ZrO2-TiO2 mixed oxides with a Ti and Zr molar ratio of 1/1 were prepared under various conditions by the sol-gel method. Catalysts containing 5-35% H3PO4 were prepared using these oxides and the catalytic performance of each material for vapor-phase Beckmann rearrangement of cyclohexanone oxime to É-caprolactam was determined. As the H3PO4 content in the mixed oxide increased, the specific surface area decreased; XRD results indicated that ZrO2-TiO2 became amorphous after calcinations at 700 °C. The yield of lactam increased with increasing the H3PO4 content in the mixed oxide and reached a maximum value for the 15 wt.% H3PO4 on the ZrO2-TiO2 (1/1) support. With further increase in H3PO4 content, the lactam yield decreased; the lowest value was observed for the 35 wt.% H3PO4 on the ZrO2-TiO2 (1/1) support. The acidic properties and the pore characteristics of the catalysts were key factors that affected its performance. The influences of the operating parameters on the performance of H3PO4/ZrO2-TiO2 (1/1) catalyst were also investigated. The interaction of H3PO4 with ZrO2-TiO2 (1/1) support has been investigated by FT-IR, for characterization of the interaction of H3PO4 with the support.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 287, Issue 1, 15 June 2005, Pages 83-88
Journal: Applied Catalysis A: General - Volume 287, Issue 1, 15 June 2005, Pages 83-88
نویسندگان
M. Ghiaci, A. Abbaspur, R.J. Kalbasi,