Coadsorption Chemistry of H2 and C2N2 on Pt(111): A Common Intermediate in the Hydrogenation of Cyanogen and the Dehydrogenation of Ethylenediamine on Pt(111).
CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY
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The adsorption of C2N2 on Pt111 results in two desorption states alpha, beta. The alpha state, T max 368K, is due to the desorption of molecularly adsorbed C2N2. The beta state, T max 780K, may be due to the recombination of adsorbed CN groups or the decomposition of an extended CNx polymer. Coadsorption of H2 and C2N2 results in a surface nitrene which decomposes to give back H2 and C2N2 at 430K. Decomposition of ethylenediamine results in the same species. Dehydrogenation of ethylene-diamine shows that the amine hydrogens are removed first in this process followed at 430K by the removal of the hydrogens from the carbons liberating C2N2 as the final product.
- Physical Chemistry