Role of support-nanoalloy interactions in the atomic-scale structural and chemical ordering for tuning catalytic sites

Lefu Yang, Shiyao Shan, Rameshwori Loukrakpam, Valeri Petkov, Yang Ren, Bridgid N. Wanjala, Mark H. Engelhard, Jin Luo, Jun Yin, Yongsheng Chen, Chuan Jian Zhong

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

The understanding of the atomic-scale structural and chemical ordering in supported nanosized alloy particles is fundamental for achieving active catalysts by design. This report shows how such knowledge can be obtained by a combination of techniques including X-ray photoelectron spectroscopy and synchrotron radiation based X-ray fine structure absorption spectroscopy and high-energy X-ray diffraction coupled to atomic pair distribution function analysis, and how the support-nanoalloy interaction influences the catalytic activity of ternary nanoalloy (platinum-nickel-cobalt) particles on three different supports: carbon, silica, and titania. The reaction of carbon monoxide with oxygen is employed as a probe to the catalytic activity. The thermochemical processing of this ternary composition, in combination with the different support materials, is demonstrated to be capable of fine-tuning the catalytic activity and stability. The support-nanoalloy interaction is shown to influence structural and chemical ordering in the nanoparticles, leading to support-tunable active sites on the nanoalloys for oxygen activation in the catalytic oxidation of carbon monoxide. A nickel/cobalt-tuned catalytic site on the surface of nanoalloy is revealed for oxygen activation, which differs from the traditional oxygen-activation sites known for oxide-supported noble metal catalysts. The discovery of such support-nanoalloy interaction-enabled oxygen-activation sites introduces a very promising strategy for designing active catalysts in heterogeneous catalysis.

Original languageEnglish
Pages (from-to)15048-15060
Number of pages13
JournalJournal of the American Chemical Society
Volume134
Issue number36
DOIs
StatePublished - Sep 12 2012

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