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Science 18 October 1996:
Vol. 274. no. 5286, pp. 317 - 0
DOI: 10.1126/science.274.5286.317d
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This Week in Science

Automotive exhaust catalysts, like many industrial catalysts, consist of transition metals supported on insulating materials such as alumina, and have inhomogeneous surfaces that are usually rough and complex. These features make their detailed characterization very difficult. One of the unsolved questions is the exact configuration of the metal atoms and their interactions with the support material. Nellist and Pennycook (p. 413; see the Perspective by Jefferson, p. 369) used Z-contrast microscopy, a form of scanning transmission electron microscopy, to resolve the atomic configuration of platinum dimers and trimers and a small rhodium raft on an alumina support. Such information is crucial for understanding the reactivity of heterogeneous supported catalysts.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)