Effects of potassium on the chemisorption of CO on the Mo2C/Mo(100) surface

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Abstract

The interaction of CO with K-free and K-covered Mo2C/Mo(100) surfaces has been investigated by HREELS, AES, and TPD. CO adsorbed molecularly on the clean Mo2C/Mo(100) surface at 140 K. A part of the adsorbed CO desorbed from the saturated adlayer with Tp = 330 K, which was accompanied by dissociation of the molecule at 300-350 K. The C and O adatoms formed recombined at higher temperatures, giving a CO desorption peak at 960 K. Preadsorbed potassium at intermediate coverages (ΘK = 0.5-0.8 ML) led to a considerable weakening of the C-O bond even at 140 K, as evidenced by the HREELS feature at 1320-1375 cm-1. The appearance of this loss suggested a short-range interaction, while the development of losses at 1670-1685 and 1860 cm-1 is attributed to long-range interaction in the coadsorbed layer. Potassium adatoms decreased the amount of CO desorbed and converted it into a more reactive form, which-instead of desorption-underwent dissociation at 350-550 K. The recombinative desorption of CO occurred at 970 K; its amount was 3 times higher than that measured for K-free Mo2C. Potassium was stabilized in the adsorbed layer mainly by O adatoms arising from the decomposition of CO.

Original languageEnglish
Pages (from-to)4337-4342
Number of pages6
JournalJournal of Physical Chemistry B
Volume105
Issue number19
DOIs
Publication statusPublished - May 17 2001

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Adatoms
Carbon Monoxide
Chemisorption
chemisorption
adatoms
Potassium
Desorption
potassium
desorption
dissociation
interactions
Temperature programmed desorption
Decomposition
decomposition
Molecules
molecules
Temperature

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Effects of potassium on the chemisorption of CO on the Mo2C/Mo(100) surface. / Bugyi, L.; Solymosi, F.

In: Journal of Physical Chemistry B, Vol. 105, No. 19, 17.05.2001, p. 4337-4342.

Research output: Contribution to journalArticle

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