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

Journal Article · Mon Jul 25 00:00:00 EDT 2016 · Microscopy and Microanalysis

DOI:https://doi.org/10.1017/S1431927616002634· OSTI ID:1415560

Barroo, Cedric ^[1]; Janvelyan, Nare ^[1]; Zugic, Branko ^[1]; Magyar, Andrew P. ^[1]; Akey, Austin J. ^[1]; Biener, Juergen ^[2]; Friend, Cynthia M. ^[1]; Bell, David C. ^[1]

---

1. Harvard Univ., Cambridge, MA (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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. 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 paper, we studied the morphological and compositional changes occurring at the surface of Au-based catalysts in certain conditions.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-07NA27344
• OSTI ID: 1415560
• Report Number(s): LLNL-JRNL-738655; applab; TRN: US1800837
• Journal Information: Microscopy and Microanalysis, Vol. 22, Issue S3; ISSN 1431-9276
• Publisher: Microscopy Society of America (MSA)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY