Adsorption of CO on Mg-promoted Co(poly)

Jukka Vaari, T. Vaara, J. Lahtinen, Pekka Hautojärvi

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

The effect of Mg on CO adsorption on polycrystalline Co foil has been studied using XPS and TDS. Mg was found to increase the adsorption capacity of the surface, promote the dissociation, and affect the sticking coefficient. The Mg overlayer is partially oxidized due to CO dissociation. Heating of the system above room temperature results in further Mg-promoted dissociation of CO. With increasing Mg coverage, the TDS peak at 387 K corresponding to CO desorption from the clean surface is gradually replaced by a C + O recombination feature around 900 K. The recombination is triggered by the decomposition of the Mg suboxide, observed as Mg desorption simultaneously with CO desorption.

Original languageEnglish
Pages (from-to)289-297
Number of pages9
JournalApplied Surface Science
Volume81
Issue number3
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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