کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
42892 45945 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic activity and magnetic properties of Co–ZSM-5 zeolites prepared by different methods
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic activity and magnetic properties of Co–ZSM-5 zeolites prepared by different methods
چکیده انگلیسی

The selective catalytic oxidation of styrene with hydrogen peroxide was studied over Co–ZSM-5 catalysts which differ in the preparation methods. The catalysts were obtained from NH4+–ZSM-5 by wetness impregnation and ion-exchange techniques followed by different post-thermal treatments: oxidation and reduction. The characterization of acidic properties by FTIR of adsorbed pyridine revealed that new and strong Lewis sites (1452 cm−1), different from those characteristics of aluminum in the matrix (1456 cm−1) were generated by cobalt introduction. Styrene conversion shows an important increment over the exchanged samples as compared to the impregnated ones. This behavior may be explained by the high Lewis acid sites concentration. Benzaldehyde was the main product in all the samples under study. The samples’ magnetic properties were improved with the cobalt incorporation and the applied thermal treatments. The catalytic and magnetic properties of Co–ZSM-5 samples are discussed.

The catalytic oxidation of styrene with H2O2 was studied over Co–ZSM-5 zeolites which differ in the preparation methods. Styrene conversion shows an important increment when Lewis acid sites concentration was enhanced (observed by FTIR). The magnetic properties of the zeolites were improved with cobalt incorporation and the applied thermal treatments. The catalytic and magnetic properties of Co–ZSM-5 samples are discussed.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 347, Issue 1, 1 September 2008, Pages 55–61
نویسندگان
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