NDLI: Preparation of nanosized iron oxide and its application in low temperature CO oxidation

Content Provider	Springer Nature Link
Author	Lin, Hsin Yu Chen, Yu Wen Wang, Wei Jye
Copyright Year	2005
Abstract	A method to prepare iron oxide material which has a higher surface area and nanosized particle was developed. It was used as a catalyst for CO oxidation at low temperature. Iron oxide materials were prepared by precipitation under constant pH value. The effects of preparation parameters, such as iron salt (FeCl$_{3}$, Fe(NO$_{3}$)$_{3}$ and FeCl$_{2}$), pH value (between 8 and 12), drying temperature (between 120°C and 300°C), and feeding rate of the aqueous solution of the iron salt, on the characteristics of iron oxide have been investigated. The materials were characterized by N$_{2}$ sorption, powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The surface area of iron oxide was greater than 400 m$^{2}$/g using FeCl$_{3}$ as the starting material with very low feeding rate of 10 ml/min, the pH value of 11, and drying at 120°C. The XRD patterns indicated that the iron oxide samples heated at a temperature below 180°C was either amorphous or of a particle size too small (<4 nm) for the samples prepared with FeCl$_{3}$. Depending on the preparation conditions, the iron oxide samples showed a phase transition from amorphous to various crystalline phases. Large amount of hydroxyl groups were preserved if the drying temperature was below 200°C. TEM images showed that the particle diameters were less than 4 nm for the samples prepared with FeCl$_{3}$ at pH value of 11 with a low feeding rate of 10 ml/min, and heated below 200°C. XPS Fe 2p$_{3/2}$ spectra showed the phase transition of iron oxide from Fe$_{3}$O$_{4}$ to FeO. The feeding rate of starting material and pH value during precipitation played the important roles to obtain iron oxide with high surface area. The nanosized iron oxide demonstrated high activity for CO oxidation even at ambient condition. The higher activity of Fe$_{ x }$O$_{ y }$ nanoparticles in CO oxidation was attributed to a small particle size, high surface area, high concentration of hydroxyl groups, and more densely populated surface coordination unsaturated sites.
Starting Page	249
Ending Page	263
Page Count	15
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	7
Issue Number	2-3
e-ISSN	1572896X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	iron oxide CO oxidation nanoparticle gas mask, catalysts, aerosols Inorganic Chemistry Physical Chemistry Applied Optics, Optoelectronics, Optical Devices Characterization and Evaluation Materials Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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