Reaction between NO and CO on Rh(100): how lateral interactions lead to auto-accelerating kinetics

M.J.P. Hopstaken; J.W. Niemantsverdriet

doi:10.1116/1.582375

Reaction between NO and CO on Rh(100): how lateral interactions lead to auto-accelerating kinetics

M.J.P. Hopstaken, J.W. Niemantsverdriet

Inorganic Materials & Catalysis

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Abstract

The reactions between NO and CO adsorbed on Rh(100) were studied with temperature programmed reaction spectrometry and static secondary ion mass spectrometry and compared with similar reactions on Rh(111). Elementary steps in the overall reactions, such as dissociation of NO, and reaction between CO and O atoms were studied as well. Dissociation of NO is faster on the more open Rh(100) surface, while formation of N2 is slower. Desorption of either CO or NO occurs at comparable rates on Rh(100) and Rh(111). The oxidation of CO to CO2 proceeds much faster on Rh(100) than on Rh(111). When the Rh(100) surface is saturated with NO and CO, explosive formation of CO2 is observed, which can be explained by an autocatalytic mechanism, in which the availability of empty sites plays a crucial role.

Original language	English
Pages (from-to)	1503-1508
Journal	Journal of Vacuum Science and Technology A
Volume	18
Issue number	4
DOIs	https://doi.org/10.1116/1.582375
Publication status	Published - 2000

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title = "Reaction between NO and CO on Rh(100): how lateral interactions lead to auto-accelerating kinetics",

abstract = "The reactions between NO and CO adsorbed on Rh(100) were studied with temperature programmed reaction spectrometry and static secondary ion mass spectrometry and compared with similar reactions on Rh(111). Elementary steps in the overall reactions, such as dissociation of NO, and reaction between CO and O atoms were studied as well. Dissociation of NO is faster on the more open Rh(100) surface, while formation of N2 is slower. Desorption of either CO or NO occurs at comparable rates on Rh(100) and Rh(111). The oxidation of CO to CO2 proceeds much faster on Rh(100) than on Rh(111). When the Rh(100) surface is saturated with NO and CO, explosive formation of CO2 is observed, which can be explained by an autocatalytic mechanism, in which the availability of empty sites plays a crucial role.",

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N2 - The reactions between NO and CO adsorbed on Rh(100) were studied with temperature programmed reaction spectrometry and static secondary ion mass spectrometry and compared with similar reactions on Rh(111). Elementary steps in the overall reactions, such as dissociation of NO, and reaction between CO and O atoms were studied as well. Dissociation of NO is faster on the more open Rh(100) surface, while formation of N2 is slower. Desorption of either CO or NO occurs at comparable rates on Rh(100) and Rh(111). The oxidation of CO to CO2 proceeds much faster on Rh(100) than on Rh(111). When the Rh(100) surface is saturated with NO and CO, explosive formation of CO2 is observed, which can be explained by an autocatalytic mechanism, in which the availability of empty sites plays a crucial role.

AB - The reactions between NO and CO adsorbed on Rh(100) were studied with temperature programmed reaction spectrometry and static secondary ion mass spectrometry and compared with similar reactions on Rh(111). Elementary steps in the overall reactions, such as dissociation of NO, and reaction between CO and O atoms were studied as well. Dissociation of NO is faster on the more open Rh(100) surface, while formation of N2 is slower. Desorption of either CO or NO occurs at comparable rates on Rh(100) and Rh(111). The oxidation of CO to CO2 proceeds much faster on Rh(100) than on Rh(111). When the Rh(100) surface is saturated with NO and CO, explosive formation of CO2 is observed, which can be explained by an autocatalytic mechanism, in which the availability of empty sites plays a crucial role.

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M3 - Article

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JO - Journal of Vacuum Science and Technology A

JF - Journal of Vacuum Science and Technology A

IS - 4

ER -

Reaction between NO and CO on Rh(100): how lateral interactions lead to auto-accelerating kinetics

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