کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5361547 | 1388274 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal treatment effects on the Ru/CeO2 catalysts performance for partial hydrogenation of benzene
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The aim of this work is to study the effect of the preparation conditions of Ru/CeO2 catalyst (calcination temperature and/or reduction) over the performance in the partial hydrogenation of benzene reaction in the presence of TiCl3. The catalysts were prepared through chlorinated precursors by incipient wetness impregnation method. The reaction occurred in three-phase reactional medium in presence of water at 373Â K and 5.0Â MPa. Temperature programmed reduction (TPR) profiles of calcinated catalysts indicate the presence of oxidated ruthenium. X-ray photoelectron spectroscopy (XPS) analysis confirms this supposition, showing that the ruthenium appears in the form of RuO2 for the sample calcinated at 673Â K, while for the reduced solid at 773Â K, the Ru appears in the metallic state. However, the calcination step followed or not by reduction, strongly hinders the catalytic performance. In its turn, the direct reduction leads to a more active Ru/CeO2 catalysts, as well as higher cyclohexene yields throughout all the reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 254, Issue 21, 30 August 2008, Pages 6849-6853
Journal: Applied Surface Science - Volume 254, Issue 21, 30 August 2008, Pages 6849-6853
نویسندگان
Priscila da Costa Zonetti, Richard Landers, Antonio José Gomez Cobo,