Decomposition of CH3NH2 on Pt and Rh: rate oscillations and surface 
intermediates

Cordonier, G.A.; Schüth, F.; Schmidt, L.D.

doi:10.1016/0042-207X(90)90334-U

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Decomposition of CH₃NH₂ on Pt and Rh: rate oscillations and surface intermediates

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Schüth, F.
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA;
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Cordonier, G., Schüth, F., & Schmidt, L. (1990). Decomposition of CH₃NH₂ on Pt and Rh: rate oscillations and surface intermediates. Vacuum, 41(1-3), 278-281. doi:10.1016/0042-207X(90)90334-U.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-3E62-7

Abstract

The adsorption and decomposition of CH₃NH₂ have been studied on Pt(111), Rh(111), and on polycrystalline wires with characterization by TPD, XPS, AES, and steady-state reactivity measurements. HCN, C₂N₂, and H₂ are the exclusive products on Pt while ∼ 15 % N₂ is produced on Rh. The dominant surface species on the surface upon heating CH₃NH₂ is therefore CN which is stable to 1100K on Pt and to 800K on Rh. On an electrically heated Pt wire in a 1 torr reactor, this reaction exhibits self-sustaining rate oscillations over a wide range of temperatures and reactant pressures. These oscillations are quite reproducible with frequencies up to 8 Hz and temperature amplitudes up to 400K. A model incorporating all known rate parameters from low pressure experiments has been shown to fit the observed data semiquantitatively assuming a simple unimolecular reaction which is blocked by adsorbed CN at low temperatures.