کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1261083 971780 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective hydrogenation of benzene to cyclohexene over monometallic ruthenium catalysts in the presence of CeO2 and ZnSO4 as co-modifiers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Selective hydrogenation of benzene to cyclohexene over monometallic ruthenium catalysts in the presence of CeO2 and ZnSO4 as co-modifiers
چکیده انگلیسی

The monometallic Ru catalysts with the CeO2 without calcination and ZnSO4 as co-modifiers gave a cyclohexene yield of 58.5% at the optimum nominal CeO2/Ru molar ratio of 0.15. Moreover, this catalyst had a good stability. The chemisorbed (Zn(OH)2)3(ZnSO4)(H2O)3 salt on Ru surface, which was formed by the CeO2 reacting with ZnSO4, created the new Ru active sites suitable for the formation of cyclohexene and improved the selectivity to cyclohexene. In addition, the Zn2+ in the aqueous phase could form a stable complex with cyclohexene, stabilizing the cyclohexene in the liquid phase and improving the selectivity to cyclohexene. The calcination treatment of CeO2 was not beneficial for the enhancement of the selectivity to cyclohexene since it is difficult for the CeO2 calcinated to react with ZnSO4 to form the (Zn(OH)2)3(ZnSO4)(H2O)3 salt.

Sketches of the roles of the chemisorbed (Zn(OH)2)3 (ZnSO4)(H2O)3 salt (a) the Zn2+ covering some of Ru active sites; (b) the chemisorbed (Zn(OH)2)3 (ZnSO4)(H2O)3 salt making the M Ru catalyst be surrounded by a firm stagnant water layerFigure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Rare Earths - Volume 31, Issue 10, October 2013, Pages 1023–1028
نویسندگان
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