Rashad, M. M. and Fouad, O. A. (2005) Synthesis and characterization of nano-sized nickel ferrites from fly ash for catalytic oxidation of CO. Materials Chemistry and Physics, 94 (2-3). 365 - 370.
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Official URL: http://www.sciencedirect.com/science/article/B6TX4...
Abstract
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 ≤ T ≤ 800 °C, impure low crystalline NiFe2O4 phase is formed. The main impurities are FeO(OH) and Fe2O3·H2O phases. Higher magnetization (32 emu g−1) 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 (8.5 nm) enhanced CO adsorption and consequently its oxidation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Catalytic oxidation |
| Subjects: | Material Science > Functional and hybrid materials Material Science > Nanofabrication processes and tools Material Science > Nanochemistry Material Science > Nanostructured materials |
| ID Code: | 4033 |
| Deposited By: | SPI |
| Deposited On: | 28 Jan 2009 09:22 |
| Last Modified: | 02 Mar 2009 10:49 |
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