Surface Modifications during a Catalytic Reaction: a Combined APT and FIB/SEM Analysis of Surface Segregation

نویسندگان

  • Cédric Barroo
  • Branko Zugic
  • Andrew P. Magyar
  • Austin J. Akey
  • Cynthia M. Friend
  • David C. Bell
  • John A. Paulson
چکیده

To improve the understanding of catalytic processes, the surface structure and composition of the active materials need to be determined before and after reaction. Morphological changes may occur under reaction conditions and can dramatically influence the reactivity and/or selectivity of a catalyst. Goldbased catalysts with different architectures are currently being developed for selective oxidation reactions at low temperatures [1]. Specifically, nanoporous Au (npAu) with a composition of Au97-Ag3 is obtained by dealloying a Ag70-Au30 bulk alloy. Recent studies highlight the efficiency of npAu catalysts for methanol oxidation using ozone to activate the catalysts before methanol oxidation. In this work, we studied the morphological and compositional changes occurring at the surface of Au-based catalysts in certain conditions.

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تاریخ انتشار 2016