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).

摘要

The adsorption of C2N2 on Pt(111) 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 (CN)x 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.