کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9782955 | 1511866 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and characterization of nano-sized nickel ferrites from fly ash for catalytic oxidation of CO
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
Nano-sized nickel ferrite powders have been synthesized from fly ash via a chemical synthesis route, co-precipitation method. X-ray diffraction analyses showed that pure crystalline nickel ferrite, NiFe2O4, phase can be obtained by thermal treatment of the precursors at temperature >800 °C for 120 min in the studied pH range, from 7 (neutral) to 12 (highly alkaline). In the temperature range of 500 °C â¤Â T â¤Â 800 °C, impure low crystalline NiFe2O4 phase is formed. The main impurities are FeO(OH) and Fe2O3·H2O phases. Higher magnetization (32 emu gâ1) is obtained for a precursor precipitated at pH 10 and thermally treated at 1200 °C for 120 min. Prepared nickel ferrite samples showed a good response toward CO oxidation. It is concluded that the lower crystal size (â¼8.5 nm) enhanced CO adsorption and consequently its oxidation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 94, Issues 2â3, 15 December 2005, Pages 365-370
Journal: Materials Chemistry and Physics - Volume 94, Issues 2â3, 15 December 2005, Pages 365-370
نویسندگان
M.M. Rashad, O.A. Fouad,