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Preparation, structure and properties of micro-spherical alumina with magnetic spinel ferrite cores

Paper ID Volume ID Publish Year Pages File Format Full-Text
44107 46003 2007 8 PDF Available
Title
Preparation, structure and properties of micro-spherical alumina with magnetic spinel ferrite cores
Abstract

Layered double hydroxide (LDH) precursors with the compositions Mg2+–Fe2+–Fe3+–CO32−–LDHs, Ni2+–Fe2+–Fe3+–CO32−–LDHs and Co2+–Fe2+–Fe3+–CO32−–LDHs have been synthesized by a method involving separate nucleation and aging steps (SNAS). After calcination at 900 °C, MgFe2O4, NiFe2O4 and CoFe2O4 spinel ferrites were obtained. Vibrating sample magnetization (VSM) measurements indicate that NiFe2O4 has the best combination of soft magnetic properties with high specific saturation magnetization, low remanence and low coercivity. Silica was coated onto the surface of the NiFe2O4 spinel ferrite particles, and the coated particles were used as magnetic cores for the preparation of porous magnetic micro-spherical alumina particles (NiFe2O4–SiO2–Al2O3) by the oil column method. Scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and low temperature nitrogen adsorption measurements indicate that the sphericity, magnetic properties and pore structure of NiFe2O4–SiO2–Al2O3 are suitable for practical applications as a catalyst or catalyst support.

Graphical abstractIn this paper, Mg2+–Fe2+–Fe3+–CO32−–LDH, Ni2+–Fe2+–Fe3+–CO32−–LDH and Co2+–Fe2+–Fe3+–CO32−–LDH precursors are converted to spinel ferrites which, after coating with silica, can be used as magnetic cores for porous magnetic micro-spherical alumina particles. These particles can be used as catalyst or catalyst support in magnetically stabilized bed technology. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Layered double hydroxides (LDHs); Separate nucleation and aging steps (SNAS); Spinel; Ferrite; Spherical alumina; Catalyst support
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Preparation, structure and properties of micro-spherical alumina with magnetic spinel ferrite cores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 329, 1 October 2007, Pages 112–119
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us