Pt–Co Alloy Nanoparticles on a γ-Al2O3 Support: Synergistic Effect between Isolated Electron-Rich Pt and Co for Automotive Exhaust Purification

Katsutoshi Sato, Ayano Ito, Hiroyuki Tomonaga, Homare Kanematsu, Yuichiro Wada, Hiroyuki Asakura, Saburo Hosokawa, Tsunehiro Tanaka, Takaaki Toriyama, Tomokazu Yamamoto, Syo Matsumura, Katsutoshi Nagaoka

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

There is interest in minimizing or eliminating the use of Pt in catalysts by replacing it with more widely abundant and cost-effective elements. The alloying of Pt with non-noble metals is a potential strategy for reducing Pt use because interactions between Pt and non-noble metals can modify the catalyst structure and electronic properties. Here, a γ-Al2O3-supported bimetallic catalyst [Pt(0.1)Co(1)/Al2O3] was prepared which contained 0.1 wt % Pt and 1 wt % Co and thus featured an extremely low Pt : Co ratio (<1 : 30 mol/mol). The Pt and Co in this catalyst formed alloy nanoparticles in which isolated electron-rich Pt atoms were present on the nanoparticle surface. The activity of this Pt(0.1)Co(1)/Al2O3 catalyst for the purification of automotive exhaust was comparable to the activities of 0.3 and 0.5 wt % Pt/γ-Al2O3 catalysts. Electron-rich Pt and metallic Co promoted activation of NOx and oxidization of CO and hydrocarbons, respectively. This strategy of tuning the surrounding structure and electronic state of a noble metal by alloying it with an excess of a non-noble metal will enable reduced noble metal use in catalysts for exhaust purification and other environmentally important reactions.

Original languageEnglish
Pages (from-to)447-456
Number of pages10
JournalChemPlusChem
Volume84
Issue number5
DOIs
Publication statusPublished - May 2019

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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