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Partial Miscibility of Metals as a Key for Improved Properties

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Abstract:

Platinum and iridium are known to belong to a family of partly miscible metals. On the other hand, these metals are high demanded as active components of the catalysts for a variety of industrially important processes. In the present work, a series of bimetallic Pt-Ir catalysts supported on alumina were prepared using a “single source precursor” concept. The ratio of metals in the alloy was varied from 1:3 to 3:1. The thermal stability and catalytic activity in CO oxidation of the samples were studied in a prompt thermal aging regime. Monometallic Pt/γ-Al2O3 and Ir/γ-Al2O3 samples were used as references. All the studied catalysts were characterized by UV-vis spectroscopy in initial state and after the aging treatment. It was found that the bimetallic nanoparticles being subjected to the high temperature aging at 600 and 800 °C undergo redistribution with further stabilization in a noticeably more active state. The observed increase in the catalytic activity is explained by an enrichment of the particles’ surface with platinum.

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Material Science and Engineering Technology VIII View Preview

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Periodical:

Materials Science Forum (Volume 998)

Pages:

151-156

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.998.151

Citation:

Cite this paper

Online since:

June 2020

Authors:

Aleksey A. Vedyagin*, Pavel E. Plyusnin, Roman M. Kenzhin, Vladimir O. Stoyanovskii, Andrey V. Zadesenets, Yury V. Shubin

Keywords:

Alumina-Supported Catalysts, CO Oxidation, Partly Miscible Metals, Pt-Ir Nanoalloy, Thermal Stability

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