Physicochemical characterization of Pt and Ir particles deposited on Ce (1-x) Ru (x) O 2 solid-solutions for CO oxidatio
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.427
Physicochemical characterization of Pt and Ir particles deposited on Ce(1-x)Ru(x)O2 solid-solutions for CO oxidation E. Gonzalez-A1, R. Rangel1, J. Lara1, J. J. Alvarado2, P. Bartolo2 1
División de Estudios de posgrado de la Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México.
2
Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del Instituto Politecnico Nacional-Unidad Mérida, Mérida, Yucatán, México.
Abstract
Pt/Ce1-xRuxO2 and Ir/Ce1-xRuxO2 catalysts were prepared through the sol-gel technique, under microwave heating. In a first step, the Ce1-xRuxO2 solid solutions were prepared. Subsequently, an incipient wet impregnation process was carried out to homogeneously achieve the dispersion, either of platinum or iridium nanoparticles. The Pt/Ce1-xRuxO2 and Ir/Ce1-xRuxO2 catalysts were characterized by means of SEM, XRD, XPS, TEM, and specific surface area measurements. Crystal size and shifting into the CeO2 structure were detected after ruthenium doping producing the Ce1-xRuxO2 solid-solutions. Trough XPS technique Pt and Ir nanoparticles were found evenly dispersed in a metallic state. Those features allow us to foresee that, in the near future, these materials could be used efficiently as catalysts for oxidation process.
INTRODUCTION The use of elements belonging to the rare earth family has evolved in its use for a large number of applications both, in the field of research and in the industry, promoting an outstanding impact in diverse applications, including electronics, medical sciences and the energy industry [1,2]. Cerium is the first of the elements of the lanthanide group that owns 4f electrons, this being the responsible feature for its great redox capacity, related to their cyclic changes from Ce+4 to Ce+3 valence state[3]. Several investigations have been carried out for better understanding of the existing interactions
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between cerium oxide and deposited metals, in order to obtain functionalized catalysts on a nanometric scale and to be more efficient as catalytic supports [3–5]. RuO2 is widely used due to their high electrical conductivity, chemical stability [6] and excellent properties as diffusion barrier [7]. Platinum has been used as an active phase in catalysts for oxidation reactions of various compounds, mainly gases [8–10]. The iridium catalysts supported in cerium oxide have been studied extensively due to the oxidative capacity of the particles of this noble metal. It is able to incorporate into the oxide matrix creating a strong interaction between Ir0 and Ce+3 during dispersion on the surface of the support. This interaction makes the Ir catalysts supported in ceria an efficient catalyst in
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