کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
61871 47610 2010 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Immobilization of anionic metalloporphyrins on zinc hydroxide nitrate and study of an unusual catalytic activity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Immobilization of anionic metalloporphyrins on zinc hydroxide nitrate and study of an unusual catalytic activity
چکیده انگلیسی

This paper is the first report on the immobilization of an anionic iron(III) porphyrin family on zinc hydroxide nitrate (ZHN), a layered hydroxide salt. ZNH was prepared by means of a precipitation reaction between a zinc nitrate solution and ammonium hydroxide. Two immobilization systems were investigated, namely magnetic stirring at room temperature and stirring/reflux in an ethanolic solution. The solids were characterized by powder X-ray diffraction (XRD), electron paramagnetic resonance (EPR), thermogravimetric and derivative thermogravimetric (TGA/DTG), transmission electron microscopy (TEM), as well as ultraviolet–visible (UV–Vis) and Fourier transform infrared (FTIR) spectroscopic analyses. The catalytic activity of the materials was investigated in the oxidation of cyclooctene, cyclohexane, and n-heptane using iodosylbenzene as oxygen donor. The oxidation products were analyzed by gas chromatography. The results revealed an unusual selectivity for cyclohexanone in the reactions of cyclohexane oxidation catalyzed by the anionic iron(III) porphyrins immobilized onto ZHN. These results suggest that the structure of the ZHN support influences the catalytic mechanism and that cyclohexane oxidation occurs via a radicalar pathway.

The catalytic results of the solids obtained by the immobilization of iron porphyrins on zinc hydroxide nitrate, a layered hydroxide salt, in the cyclohexane oxidation, revealed an unusual selectivity for cyclohexanone.Figure optionsDownload high-quality image (65 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 274, Issue 2, 9 September 2010, Pages 130–141
نویسندگان
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