کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
77312 | 49162 | 2006 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cr(VI) immobilization in mixed (Mg, Al) oxides
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Cr(VI) immobilization in mixed (Mg, Al) oxides Cr(VI) immobilization in mixed (Mg, Al) oxides](/preview/png/77312.png)
چکیده انگلیسی
In the reaction sequence of thermal decomposition of chromate exchanged hydrotalcite a spinel structure was detected at 800 °C; the main compound was a periclase-like structure. At 1000–1200 °C the only compounds were MgO and the spinel MgAl1.3Cr0.7O4. The particle size and morphology did not change with gamma irradiation or thermal treatments. The composition of the spinels MgAl2−xCrxO4 varies when samples are irradiated and/or thermally treated. Aluminum in octahedral sites is displaced to tetrahedral sites as chromium is incorporated into spinels. A molecular dynamics simulation of the spinels reproduced the experimental behaviour. A mechanism based on thermodynamical data and Wagner reactions is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 94, Issues 1–3, 8 September 2006, Pages 234–242
Journal: Microporous and Mesoporous Materials - Volume 94, Issues 1–3, 8 September 2006, Pages 234–242
نویسندگان
S. Martinez-Gallegos, H. Pfeiffer, E. Lima, M. Espinosa, P. Bosch, S. Bulbulian,