کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6453323 1418519 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalytic properties of CuMgAlO catalyst and degradation mechanism in CWPO of methyl orange
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Catalytic properties of CuMgAlO catalyst and degradation mechanism in CWPO of methyl orange
چکیده انگلیسی


- Cu-loaded MgAl hydrotalcite catalysts were synthesized by impregnation method.
- The synthesized catalysts were further used for catalytic wet peroxidation (CWPO) of methyl orange (MO).
- The CuMgAlO catalyst showed the highest catalytic activity, stable performance.
- The degradation mechanism of MO was determined.

Cu-loaded MgAl hydrotalcite catalysts were synthesized by impregnation method and further used for catalytic wet peroxidation (CWPO) of methyl orange (MO) using hydrogen peroxide as oxidant. The synthesized catalysts have been characterized by XRD, FT-IR, SEM/EDS, TG/DTA, XPS, H2-TPR and BET. The characterizations showed that a good dispersion of Cu species inside the MgAl hydrotalcite supports, where Cu2+ and Cu+ species were coexistence, mainly existed as Cu2+ ↔ Cu+ pairs. The CuMgAlO catalyst showed the highest catalytic activity due to the high content of Cu2+ ↔ Cu+ pairs, stable performance during reuse for five cycles with fewer copper leaching. The degradation mechanism of MO was determined by UV-vis, ATR-FTIR and GC-MS. The hydroxyl radicals (HO) induced strong oxidizing effect, where the azo groups (NN−) double bonds would be first attacked by the hydroxyl radical and other free radicals. With the continuous oxidization, these intermediates could be oxidized to the final oxidation products, such as water and carbon dioxide.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 527, 25 October 2016, Pages 72-80
نویسندگان
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