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NO Reduction by CO Catalyzed with Au/TiO2 in Oxygen-rich Condition

Published online by Cambridge University Press:  01 February 2011

J. A. Wang ,
J. A. Toledo ,
C. Angeles ,
M. Moran-Pineda  and
A. García-Ruiz
J. A. Wang
Affiliation:
ESIQIE, Instituto Politécnico Nacional, Col. Zacatenco, C. P. 07738, México D.F., Mexico
J. A. Toledo
Affiliation:
Programa de Ingenería Moleciular, Instituto Mexicano del Petróleo. Eje Lázaro Cárdenas 152, C. P. 07730, México D. F., Mexico
C. Angeles
Affiliation:
Programa de Ingenería Moleciular, Instituto Mexicano del Petróleo. Eje Lázaro Cárdenas 152, C. P. 07730, México D. F., Mexico
M. Moran-Pineda
Affiliation:
Programa de Ingenería Moleciular, Instituto Mexicano del Petróleo. Eje Lázaro Cárdenas 152, C. P. 07730, México D. F., Mexico
A. García-Ruiz
Affiliation:
UPIICSA, Instituto Politécnico Nacional, Te 950, Col. Granjas-México, Iztacalco, 08400, México, D. F. Mexico
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Abstract

Gold nanoparticles supported on titania catalysts with different Au loadings were prepared and evaluated in the reaction of NO reduction by CO in an oxygen rich condition. The crystalline structures of the Au/TiO2 materials were refined with Rietveld method. TiO2 support chiefly contains anatase phase, having a crystalline size ranged from 5 to 15 nm. Au particles have an average crystal size approximately 2-5 nm as Au concentration less 3 wt %. In the reaction of NO + CO + O2, the Au/TiO2catalysts show a selectivity to 100 % N2, neither NO2 nor N2O was yielded in the reaction temperature between 25 and 400 °C, which strongly indicates that Au/TiO2catalysts are much superior to the other catalysts like Pt/TiO2 catalysts on which N2O was usually produced in the reaction temperature below 200 °C and NO2 was produced in the reaction temperature above 300 °C under a similar reaction condition.

Keywords

TitaniaNO reductionCO oxidationsol-gel synthesisAu/TiO2catalysts
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1279: New Catalytic Materials , 2010 , 30
Copyright
Copyright © Materials Research Society 2010

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