Abstract
Abstract The geometric and electronic structures of NO adsorbed on three metals (Ni, Rh, and Pt) from 130 to 600 K were investigated by using near edge X-ray absorption fine structure (NEXAFS) and resonant photoemission spectroscopy (RPS). NEXAFS revealed that NO was molecularly adsorbed on all three metals at 130 K with its molecular axis normal to the surface. The elongation of the NO intramolecular bond on metal was in the order Ni>Rh>Pt, and was related to the electron-back donation from metal-d band to 2π of NO. This order was the same for the electron donation from 5σ of NO to metal-d band estimated by using RPS. With heating, NO was desorbed from Pt without dissociation, whereas NO on Ni and Rh dissociated. Both NEXAFS and RPS showed that the electronic interaction between NO and Pt was increased by heating, but desorption preceded dissociation. The above results were finally related to the catalytic properties of the three metals for the reaction of NO.
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