✦ LIBER ✦

Critical size of surfaces and means of synchronization for the oscillating reduction of NO by NH3 over Rh

✍ Scribed by Maurits F.H. van Tol; Janine de Maaijer-Gielberg; Bernard E. Nieuwenhuys

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 559 KB
Volume: 205
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)89231-6

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✦ Synopsis

The reduction of NO by NHs over Rb was studied by field emission microscopy (PEM ). Similar to our earlier reported obscrvations for the NO-Hz reaction, a surface explosion was observed. A novel observation is the occurrence of local oscillations on the ( 5 1 1 )-(7 11) areas of the tip. The results presented here show new evidence for the dominant role of gas phase coupling for the communication between the surfaces at higher temperatures. It is also shown that the minimum surface size required for the observation of collective phenomena, like osciBations in electron emission current intensity, may be smaller than was assumed so far. Depending on the reaction conditions only 10s Rh atoms are sufficient to establish sufftcient coupling through the gas phase.

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