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The effects of carbon monoxide on the adsorption of nitric oxide on polycrystalline platinum

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Abstract

The effets of carbon monoxide on the adsorption and desorption of nitric oxide on the surface of polycrystalline platinum foil have been studied using the technique of thermal desorption spectroscopy (TDS) under ultra high vacuum conditions It is suggested that the surface of polycrystalline platinum used in this study consists of Pt(111) plane Pt(100) plane and a small amount of high index surfaces. The α-CO preadsorbed at 300 K prevents inderectly nitric oxide from adsorbing on the sites of the surface giving α-No peak. The repulsive force between α-CO and α-NO is very strong but a small amount of α-NO adsorbs even on the surface of platinum saturated by 50 L CO. The adsorption sites for β-CO coincide with those for β-NO and predosing with more than 10 L CO blocks entirely the adsorption sites for β-NO. β-NO reacts readily with CO producing carbon dioxide and molecular nitrogen and the reaction between CO and NO proceeds via Langmuir-Hinshelwood mechanism.

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Abbreviations

AES:

Auger electron spectroscopy

EELS:

electron energy loss spectroscopy

ESCA:

electron spectroscopy for chemical analysis

IRRAS:

infrared reflection absorption spectroscopy

K:

kelvin(s) ds a unit of absolute temperature

L:

langniuir(s) as a unit of exposure

m/e:

mass number ratio of mass to charge in mass spectroscopy

Pt(100) Pt(110) Pt(111):

Miller index for the considered surface of platinum single crystal

TDS:

thermal desorptiun spectroscopy

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Authors and Affiliations

  1. Department of Chemical technology, College of Engineering, Seoul National University, 151, Seoul, Korea

    Youn Seok Park, Wha Young Lee, Hyun-ku Rhee, Buick Pajung Sung & Ho-In Lee

  2. Department of Chemecal Engineering College of Engineering, Seoul National University, 151, Seoul, Korea

    Wha Young Lee, Hyun-ku Rhee & Buick Pajung Sung

Authors
  1. Youn Seok Park
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  2. Wha Young Lee
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  3. Hyun-ku Rhee
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  4. Buick Pajung Sung
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  5. Ho-In Lee
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Park, Y.S., Lee, W.Y., Rhee, Hk. et al. The effects of carbon monoxide on the adsorption of nitric oxide on polycrystalline platinum. Korean J. Chem. Eng. 3, 165–170 (1986). https://doi.org/10.1007/BF02705028

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  • DOI: https://doi.org/10.1007/BF02705028

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