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The non-linear behaviour of the NO-H2 reaction over Rh surfaces
Authors:N.M.H. Janssen  J. A. Neill  P. D. Cobden  B. E. Nieuwenhuys  M. Ikai  K. Tanaka
Abstract:In this paper we describe the non-linearity of the NO-H2 reaction over Rh surfaces. Rate oscillations have been observed over a stepped (111) surface with (100) steps, (Rh(533) at low pressures (10?4 Pa) below 500 K, while no oscillations could be observed under these conditions over a Rh(100) surface and a stepped (100) surface with (111) steps, Rh(711). The thermal stability of the N atoms formed during the reaction explains the observed structure sensitivity. Moreover, the results suggest that diffusion of N atoms is needed to synchronise the rate oscillations, a process that is absent on Rh(100) and Rh(711).
Keywords:NO-H2 reaction over Rh  non-linearity  Rh(533)  Rh(100)  Rh(711)
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