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Shape and size controlled α-Fe2O3 nanoparticles as supports for gold-catalysts: Synthesis and influence of support shape and size on catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
42860 45944 2009 6 PDF Available
Title
Shape and size controlled α-Fe2O3 nanoparticles as supports for gold-catalysts: Synthesis and influence of support shape and size on catalytic performance
Abstract

Synthesis of shape- and size- controlled α-Fe2O3 nanoparticles was performed through a hydrothermal method assisted with amino acids. The products were characterized by transmission electron microscopy and X-ray diffraction. It was found that the type of amino acids has significant impact on the shape and size of the obtained α-Fe2O3 nanoparticles. The use of acidic amino acids typically leads to the formation of α-Fe2O3 nanoparticles with spindle shape. However, rhombohedrally shaped α-Fe2O3 nanoparticles were formed in the case of basic amino acids. When gold colloidal nanoparticles were deposited on the surfaces of α-Fe2O3 nanoparticles, Au/α-Fe2O3 catalysts display substantial differences in catalytic activities in CO oxidation for the differently shaped α-Fe2O3 nanoparticles used as supports. In general, spindle shaped Au/α-Fe2O3 shows higher catalytic activity than catalysts based on rhombohedral iron oxide. Under our catalytic test conditions, for spindle shaped Au/α-Fe2O3 catalyst, large hematite crystals induce higher catalytic activity than smaller ones, whereas for rhombohedral Au/α-Fe2O3 catalysts, medium-sized α-Fe2O3 nanocrystals show high catalytic activity for CO oxidation.

Graphical abstractShape and size controlled α-Fe2O3 single crystals were synthesized by a hydrothermal method in the presence of amino acids. When gold colloidal nanoparticles were deposited on the surfaces of the synthesized α-Fe2O3 nanoparticles, Au/α-Fe2O3 catalysts display remarkable differences in catalytic activities in CO oxidation for the differently shaped and sized α-Fe2O3 nanoparticles used as supports.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hematite; Amino acids; Hydrothermal method; Gold catalysts; CO oxidation
First Page Preview
Shape and size controlled α-Fe2O3 nanoparticles as supports for gold-catalysts: Synthesis and influence of support shape and size on catalytic performance
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 364, Issues 1–2, 31 July 2009, Pages 42–47
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis