Open Access Nano Express

Influence of Rare Earth Doping on the Structural and Catalytic Properties of Nanostructured Tin Oxide

Humberto V Fajardo1*, Elson Longo1, LuizFD Probst2, Antoninho Valentini3, NeftalíLV Carreño4, Michael R Nunes4, Adeilton P Maciel5 and Edson R Leite5

Author Affiliations

1 Instituto de Química de Araraquara, Departamento de Bioquímica e Tecnologia Química, Universidade Estadual Paulista, Rua Francisco Degni s/n, Quitandinha, 14801-907, Araraquara, SP, Brasil

2 Departamento de Química, Universidade Federal de Santa Catarina, 88040-900, Florianópolis, SC, Brasil

3 Departamento de Química Analítica e Físico-Química, Universidade Federal do Ceará, 60451-970, Fortaleza, CE, Brasil

4 Departamento de Química Analítica e Inorgânica, Universidade Federal de Pelotas, 96010-900, Capão do Leão, RS, Brasil

5 Departamento de Química, Universidade Federal de São Carlos, 13560-905, São Carlos, SP, Brasil

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Nanoscale Research Letters 2008, 3:194-199  doi:10.1007/s11671-008-9135-3

Published: 28 May 2008

Abstract

Nanoparticles of tin oxide, doped with Ce and Y, were prepared using the polymeric precursor method. The structural variations of the tin oxide nanoparticles were characterized by means of nitrogen physisorption, carbon dioxide chemisorption, X-ray diffraction, and X-ray photoelectron spectroscopy. The synthesized samples, undoped and doped with the rare earths, were used to promote the ethanol steam reforming reaction. The SnO2-based nanoparticles were shown to be active catalysts for the ethanol steam reforming. The surface properties, such as surface area, basicity/base strength distribution, and catalytic activity/selectivity, were influenced by the rare earth doping of SnO2and also by the annealing temperatures. Doping led to chemical and micro-structural variations at the surface of the SnO2particles. Changes in the catalytic properties of the samples, such as selectivity toward ethylene, may be ascribed to different dopings and annealing temperatures.

Keywords:
Tin oxide; Rare earth; Nanocatalysts; Ethanol steam reforming; Basic sites