Improved properties of the catalytic model system Ni/Ru(0001)

Rasmus Egeberg; Ib Chorkendorff

doi:10.1023/A:1013222700618

Improved properties of the catalytic model system Ni/Ru(0001)

Rasmus Egeberg, Ib Chorkendorff

Department of Physics

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The dissociative chemisorption of CH4 on Ni overlayers on Ru(0001) has been investigated. It is found that the initial sticking probability at T = 530 K is approximately a factor of 20-30 higher on a pseudomorphic overlayer of Ni than on Ni(111) and a factor of two higher than on Ru(0001) illustrating the unique properties of metal-on-metal systems. The effect of enhanced reactivity is primarily ascribed to electronic effects induced by a straining of the Ni overlayer. The enhanced reactivity towards CH4 is accompanied by new features in the thermal desorption spectra of CO. The reactivity of the, system depends strongly on the annealing temperature. Molecular beam experiments at high translational energy are qualitatively different from thermal data showing a monotonic decrease of the CH4 sticking probability as Ni is added.

Original language	English
Journal	CATALYSIS LETTERS
Volume	77
Issue number	4
Pages (from-to)	207-213
ISSN	1011-372X
DOIs	https://doi.org/10.1023/A:1013222700618
Publication status	Published - 2001

Keywords

bimetallic catalysts
metal overlayers
Ni
Ru
methane dissociation

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title = "Improved properties of the catalytic model system Ni/Ru(0001)",

abstract = "The dissociative chemisorption of CH4 on Ni overlayers on Ru(0001) has been investigated. It is found that the initial sticking probability at T = 530 K is approximately a factor of 20-30 higher on a pseudomorphic overlayer of Ni than on Ni(111) and a factor of two higher than on Ru(0001) illustrating the unique properties of metal-on-metal systems. The effect of enhanced reactivity is primarily ascribed to electronic effects induced by a straining of the Ni overlayer. The enhanced reactivity towards CH4 is accompanied by new features in the thermal desorption spectra of CO. The reactivity of the, system depends strongly on the annealing temperature. Molecular beam experiments at high translational energy are qualitatively different from thermal data showing a monotonic decrease of the CH4 sticking probability as Ni is added.",

keywords = "bimetallic catalysts, metal overlayers, Ni, Ru, methane dissociation",

author = "Rasmus Egeberg and Ib Chorkendorff",

year = "2001",

doi = "10.1023/A:1013222700618",

language = "English",

volume = "77",

pages = "207--213",

journal = "Catalysis Letters",

issn = "1011-372X",

publisher = "Springer New York",

number = "4",

}

TY - JOUR

T1 - Improved properties of the catalytic model system Ni/Ru(0001)

AU - Egeberg, Rasmus

AU - Chorkendorff, Ib

PY - 2001

Y1 - 2001

N2 - The dissociative chemisorption of CH4 on Ni overlayers on Ru(0001) has been investigated. It is found that the initial sticking probability at T = 530 K is approximately a factor of 20-30 higher on a pseudomorphic overlayer of Ni than on Ni(111) and a factor of two higher than on Ru(0001) illustrating the unique properties of metal-on-metal systems. The effect of enhanced reactivity is primarily ascribed to electronic effects induced by a straining of the Ni overlayer. The enhanced reactivity towards CH4 is accompanied by new features in the thermal desorption spectra of CO. The reactivity of the, system depends strongly on the annealing temperature. Molecular beam experiments at high translational energy are qualitatively different from thermal data showing a monotonic decrease of the CH4 sticking probability as Ni is added.

AB - The dissociative chemisorption of CH4 on Ni overlayers on Ru(0001) has been investigated. It is found that the initial sticking probability at T = 530 K is approximately a factor of 20-30 higher on a pseudomorphic overlayer of Ni than on Ni(111) and a factor of two higher than on Ru(0001) illustrating the unique properties of metal-on-metal systems. The effect of enhanced reactivity is primarily ascribed to electronic effects induced by a straining of the Ni overlayer. The enhanced reactivity towards CH4 is accompanied by new features in the thermal desorption spectra of CO. The reactivity of the, system depends strongly on the annealing temperature. Molecular beam experiments at high translational energy are qualitatively different from thermal data showing a monotonic decrease of the CH4 sticking probability as Ni is added.

KW - bimetallic catalysts

KW - metal overlayers

KW - Ni

KW - Ru

KW - methane dissociation

U2 - 10.1023/A:1013222700618

DO - 10.1023/A:1013222700618

M3 - Journal article

VL - 77

SP - 207

EP - 213

JO - Catalysis Letters

JF - Catalysis Letters

SN - 1011-372X

IS - 4

ER -