Oxygen-exchange reaction between O2 and NO coadsorbed on a Pt(111) surface: reactivity of molecularly adsorbed oxygen |
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| Affiliation: | 1. College of Physics and Electronic Engineering, Quantum Materials Research Center, Zhengzhou Normal University, Zhengzhou, Henan, 450044, China;2. College of Physics and Electronic Engineering, Henan Normal University, Xinxiang, Henan, 453007, China;3. School of Physics, Anyang Normal University, Anyang, 455000, China;1. College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, People''s Republic of China;2. College of Physical Science and Technology, Sichuan University, Chengdu 610065, People''s Republic of China;1. Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;2. Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran;3. Research Center for Basic Sciences & Modern Technologies (RBST), Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran;1. Department of Bioengineering and Nano-Bioengineering, Incheon National University, Incheon 22012, Republic of Korea;2. Department of Molecular Science and Technology, Ajou University, Suwon 16499, Republic of Korea |
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| Abstract: | The oxygen-exchange reaction between N16O and 18O2 coadsorbed on Pt(111) has been studied by temperature-programmed desorption (TPD). Reaction products of N18O and 18O16O are desorbed from Pt(111) initially saturated with 18O2 at 94 K followed by exposure of N16O. Three distinct desorption peaks are observed in N18O TPD spectra at 145, 310, and 340 K, and two peaks in 18O16O at 155 K and between 600 and 1000 K. In contrast, the exchange reaction is greatly suppressed when oxygen molecules are replaced with oxygen adatoms at three-fold hollow sites of Pt(111). These results strongly suggest that adsorbed oxygen molecules are responsible for the exchange reaction. NO2 or NO3 is postulated as a reaction intermediate. However, since desorption signals corresponding to these species are not detected, the oxygen-exchanged products are not due to the cracking processes of the higher order nitrogen oxides in the mass spectrometer. Thus, the reaction proceeds via the intermediate that is dissociated during the elevation of surface temperature. |
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