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Crystal‐Phase‐ and Morphology‐Controlled Synthesis of Fe 2 O 3 Nanomaterials
Author(s) -
Mou Xiaoling,
Li Yong,
Zhang Bingsen,
Yao Lide,
Wei Xuejiao,
Su Dang Sheng,
Shen Wenjie
Publication year - 2012
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201101066
Subject(s) - nanorod , chemistry , calcination , nanomaterials , phase (matter) , aqueous solution , crystal (programming language) , polyethylene glycol , ferric , inorganic chemistry , chemical engineering , precipitation , adsorption , catalysis , organic chemistry , physics , meteorology , computer science , engineering , programming language
α‐ and γ‐Fe 2 O 3 nanorods have been prepared from a β‐FeOOH precursor that was obtained by aqueous‐phase precipitation of ferric chloride. The oxyhydroxide precursor had a rodlike shape with a diameter of 30–40 nm and a length of 400–500 nm. Calcination at 500 °C of the rod‐shaped oxyhydroxide in air yielded α‐Fe 2 O 3 nanorods, whereas heating to reflux in polyethylene glycol (PEG) at 200 °C resulted in the formation of γ‐Fe 2 O 3 nanorods. Both oxides inherited the rodlike morphology of the precursor but exposed different crystalline facets. When being used to catalyze NO reduction by CO, an environmentally important reaction in NO abatement, the γ‐Fe 2 O 3 nanorods were much more active than the α‐Fe 2 O 3 nanorods and showed an apparent crystal‐phase effect. This was because the γ‐Fe 2 O 3 nanorods simultaneously exposed iron and oxygen ions on their surfaces, which facilitated the adsorption and activation of NO and CO molecules.