Partial miscibility of metals as a key for improved properties

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

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 ℃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.

Original languageEnglish
Title of host publicationMaterial Science and Engineering Technology VIII
EditorsRamesh K. Agarwal
PublisherTrans Tech Publications Ltd
Pages151-156
Number of pages6
ISBN (Print)9783035716061
DOIs
Publication statusPublished - 1 Jan 2020
Event8th International Conference on Material Science and Engineering Technology, ICMSET 2019 - Singapore, Singapore
Duration: 19 Oct 201921 Oct 2019

Publication series

NameMaterials Science Forum
Volume998 MSF
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference8th International Conference on Material Science and Engineering Technology, ICMSET 2019
CountrySingapore
CitySingapore
Period19.10.201921.10.2019

Keywords

  • Alumina-supported catalysts
  • CO oxidation
  • Partly miscible metals
  • Pt-Ir nanoalloy
  • Thermal stability

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