Electronic factors in chemisorption: NH3 adsorption


In this paper experimental verification of the importance of electronic factors in determining the structure of chemisorbed species on various metals is presented. Furthermore, the modification of a single surface so as to change its chemisorption characteristics is demonstrated. Infrared spectra of NH3 chemisorbed on vanadium and iron films at room temperature indicate adsorption occurs largely without dissociation. The NH3 surface species are electron-donating with respect to the CO surface species. NH3 does not adsorb in an undissociated form on our films of nickel and palladium. However adsorption of CO on these latter surfaces conditions them so that a NH3 surface complex is stable. The stability of NH3 on particular surfaces and its modification are explicable in terms of the electronic structure of the metal surface and a molecular orbital model of the bonding of NH3 and CO to the metal surface. © 1972.

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Journal of Catalysis