Au/Y-TiO2 Catalyst: High Activity and Long-Term Stability in CO Oxidation

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Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Ciudad Universitaria, A. P. 70-186, Delegación Coyoacán, C.P. 04510, México D. F., Mexico
División de Materiales Avanzados, IPICYT, Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José 2055 Col. Lomas 4a. sección C.P. 78216, San Luis Potosí, S.L.P., Mexico
§ Departamento de Química General, Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 Sur 6301, Puebla, Puebla 72570, Mexico
*E-mail: [email protected]. Phone: +52(55)56228635. Fax +52 (55) 55500654.
Cite this: ACS Catal. 2012, 2, 1, 1–11
Publication Date (Web):November 14, 2011
Copyright © 2011 American Chemical Society
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Gold catalysts supported on TiO2 doped with Y (1, 3, and 6 wt % of Y) were prepared by the deposition-precipitation with urea method. Two yttrium precursors were used: yttrium acetylacetonate and yttrium nitrate. The Y-TiO2 supports prepared by the sol–gel method allowed the formation of solids with high specific surface area. The incorporation of yttrium restricted the growth of TiO2 anatase crystals and hindered the transformation to the rutile phase. The average gold particle size was very similar in all the prepared catalysts (∼3 nm). Au/Y-TiO2 catalysts showed higher activity and stability at room temperature than Au/TiO2 in the CO oxidation reaction. This behavior is related to the strong anchoring of the gold particles on the structural defects and oxygen vacancies of the support caused by the doping of the anatase with yttrium. The variation of the yttrium precursor (acetylacetonate or nitrate) did not have an important effect on the catalytic activity or the temporal stability of the catalysts. In the samples with a high content of Y, High Resolution Transmission Electron Microscopy (HRTEM) results suggest the segregation of yttrium as Y2O3 on the surface of TiO2. The presence of Y2O3 crystals on the TiO2 surface had a detrimental effect on the catalytic activity.

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