The adsorption and decomposition of trimethylamine on the clean and oxidized Mo(100) surface

B. W. Walker; P. C. Stair

doi:10.1016/0039-6028(81)90268-5

The adsorption and decomposition of trimethylamine on the clean and oxidized Mo(100) surface

B. W. Walker^*, P. C. Stair

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

The adsorption and decomposition of trimethylamine ((CH₃)₃N) has been studied by LEED, Auger and thermal desorption spectroscopy on clean and oxygen pretreated Mo(100) surfaces. On the clean surface, trimethylamine initially decomposes into atomic species. After the surface has been partially passivated by these decomposition products, the adsorption of trimethylamine is molecular. Adsorption on a series of oxygen pretreated surfaces was investigated with oxygen concentrations ranging from approximately 0.8 monolayer to MoO₂. Adsorption on these surfaces was purely molecular. The molecular adsorbate decomposes on heating to produce H₂, N₂, CO (on oxidized surfaces only), CH₄ and HCN. The adsorption and decomposition of trimethylamine (saturation coverage, products and desorption temperature) is independent of oxygen concentration from the monolayer regime up to MoO₂. The rate limiting step in the formation of CH₄ and HCN is C-N bond breaking for trimethylamine decomposition. A dramatic reduction in the temperature for N₂ desorption due to the presence of adsorbed carbon was also observed.

Original language	English (US)
Pages (from-to)	315-337
Number of pages	23
Journal	Surface Science
Volume	103
Issue number	2-3
DOIs	https://doi.org/10.1016/0039-6028(81)90268-5
State	Published - Feb 2 1981

Funding

This researchw as partially supportedu nder the NSF-MRL programt hrough the Materials ResearchC enter of Northwestern University (Grant No. DMR 76-80847) and by the National Science Foundation under Grant No. CHE-7909268. Acknowledgement is made to the Donors of The Petroleum ResearchF und, administered by the American Chemical Society, for partial support of this research.T he Raman work was supported by the Office of Naval Researcht hrough Contract NOOO14-79-c-0794.

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(81)90268-5

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title = "The adsorption and decomposition of trimethylamine on the clean and oxidized Mo(100) surface",

abstract = "The adsorption and decomposition of trimethylamine ((CH3)3N) has been studied by LEED, Auger and thermal desorption spectroscopy on clean and oxygen pretreated Mo(100) surfaces. On the clean surface, trimethylamine initially decomposes into atomic species. After the surface has been partially passivated by these decomposition products, the adsorption of trimethylamine is molecular. Adsorption on a series of oxygen pretreated surfaces was investigated with oxygen concentrations ranging from approximately 0.8 monolayer to MoO2. Adsorption on these surfaces was purely molecular. The molecular adsorbate decomposes on heating to produce H2, N2, CO (on oxidized surfaces only), CH4 and HCN. The adsorption and decomposition of trimethylamine (saturation coverage, products and desorption temperature) is independent of oxygen concentration from the monolayer regime up to MoO2. The rate limiting step in the formation of CH4 and HCN is C-N bond breaking for trimethylamine decomposition. A dramatic reduction in the temperature for N2 desorption due to the presence of adsorbed carbon was also observed.",

author = "Walker, \{B. W.\} and Stair, \{P. C.\}",

note = "Funding Information: This researchw as partially supportedu nder the NSF-MRL programt hrough the Materials ResearchC enter of Northwestern University (Grant No. DMR 76-80847) and by the National Science Foundation under Grant No. CHE-7909268. Acknowledgement is made to the Donors of The Petroleum ResearchF und, administered by the American Chemical Society, for partial support of this research.T he Raman work was supported by the Office of Naval Researcht hrough Contract NOOO14-79-c-0794.",

year = "1981",

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doi = "10.1016/0039-6028(81)90268-5",

language = "English (US)",

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pages = "315--337",

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T1 - The adsorption and decomposition of trimethylamine on the clean and oxidized Mo(100) surface

AU - Walker, B. W.

AU - Stair, P. C.

N1 - Funding Information: This researchw as partially supportedu nder the NSF-MRL programt hrough the Materials ResearchC enter of Northwestern University (Grant No. DMR 76-80847) and by the National Science Foundation under Grant No. CHE-7909268. Acknowledgement is made to the Donors of The Petroleum ResearchF und, administered by the American Chemical Society, for partial support of this research.T he Raman work was supported by the Office of Naval Researcht hrough Contract NOOO14-79-c-0794.

PY - 1981/2/2

Y1 - 1981/2/2

N2 - The adsorption and decomposition of trimethylamine ((CH3)3N) has been studied by LEED, Auger and thermal desorption spectroscopy on clean and oxygen pretreated Mo(100) surfaces. On the clean surface, trimethylamine initially decomposes into atomic species. After the surface has been partially passivated by these decomposition products, the adsorption of trimethylamine is molecular. Adsorption on a series of oxygen pretreated surfaces was investigated with oxygen concentrations ranging from approximately 0.8 monolayer to MoO2. Adsorption on these surfaces was purely molecular. The molecular adsorbate decomposes on heating to produce H2, N2, CO (on oxidized surfaces only), CH4 and HCN. The adsorption and decomposition of trimethylamine (saturation coverage, products and desorption temperature) is independent of oxygen concentration from the monolayer regime up to MoO2. The rate limiting step in the formation of CH4 and HCN is C-N bond breaking for trimethylamine decomposition. A dramatic reduction in the temperature for N2 desorption due to the presence of adsorbed carbon was also observed.

AB - The adsorption and decomposition of trimethylamine ((CH3)3N) has been studied by LEED, Auger and thermal desorption spectroscopy on clean and oxygen pretreated Mo(100) surfaces. On the clean surface, trimethylamine initially decomposes into atomic species. After the surface has been partially passivated by these decomposition products, the adsorption of trimethylamine is molecular. Adsorption on a series of oxygen pretreated surfaces was investigated with oxygen concentrations ranging from approximately 0.8 monolayer to MoO2. Adsorption on these surfaces was purely molecular. The molecular adsorbate decomposes on heating to produce H2, N2, CO (on oxidized surfaces only), CH4 and HCN. The adsorption and decomposition of trimethylamine (saturation coverage, products and desorption temperature) is independent of oxygen concentration from the monolayer regime up to MoO2. The rate limiting step in the formation of CH4 and HCN is C-N bond breaking for trimethylamine decomposition. A dramatic reduction in the temperature for N2 desorption due to the presence of adsorbed carbon was also observed.

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The adsorption and decomposition of trimethylamine on the clean and oxidized Mo(100) surface

Abstract

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