Geometric and electronic structures of NO adsorbed on Ni,Rh and Pt studied by using near edge X-ray absorption fine structure (NEXAFS) and resonant photoemission spectroscopy |
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| Institution: | 1. National Institute of Advanced Industrial Science and Technology (AIST), Higashi, Tsukuba, Ibaraki 305-8565, Japan;2. Department of Applied Chemistry, Science University of Tokyo, 1–3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan;3. Science University of Tokyo in Yamaguchi, 1-1-1 Daigaku-dori, Onoda, Yamaguchi 756-0884, Japan;1. College of Pharmacy, Dalian Medical University, Dalian 116044, China;2. College of Basic Medical Sciences, Dalian Medical University, Dalian 116044, China;1. CNR—Istituto Officina dei Materiali (IOM), Laboratorio TASC, 34149 Trieste, Italy;2. CNR—Istituto di Struttura della Materia (ISM), Basovizza Area Science Park, 34149 Trieste, Italy;3. CNR—Istituto di Fotonica e Nanotecnologie (IFN), via Trasea 7, 35131 Padova, Italy;4. MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden;5. Elettra-Sincrotrone Trieste, Area Science Park Basovizza, 34149 Trieste, Italy;1. Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, Suzhou Research Institute of Southeast University, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, PR China;2. Jingjiang People’s Hospital, Jingjiang 214504, PR China |
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| 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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