Cation induced changes in chemical reactivity of small metal particles

A.P.J. Jansen, R.A. Santen, van

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Samenvatting

The chem. reactivity of small metal clusters dispersed in microcavities of zeolites is shown to be significantly influenced by charge-compensating cations. Adsorption properties of CO or Lewis bases are also found to be changed. Here HFS-LCAO calcns. are reported of CO, H2, and H chemisorbed onto small Ir4 clusters in the presence of a Mg2+ ion. Anal. of these results shows that the chem. reactivity of CO, and also its IR spectra, should be a sensitive function of the relative positions of adsorbate, and cation. This appears also to be the case for H2 chemisorption but the effects are different. . Whereas the CO bond appears to be strengthened when the Ir4 cluster is in between the Mg2+ ions and CO, the reverse is found for H2. The bond strength of chemisorbed H2 appears to be significantly weakened due to the presence of the Mg2+ ion. It appears to be mainly due to the reduced repulsive interactions between H2 and Ir4. The result of these calcns. will be analyzed with respect to their catalytic implications
Originele taal-2Engels
TitelStructure-activity and selectivity relationships in heterogeneous catalysis : proceedings of the ACS Symposium on Structure-Activity Relationships in Heterogeneous Catalysis, Boston, MA, April 22-27, 1990
RedacteurenR.K. Grasseli, A.W. Sleight
Plaats van productieAmsterdam
UitgeverijElsevier
Pagina's221-232
ISBN van geprinte versie0-444-89088-2
DOI's
StatusGepubliceerd - 1991
EvenementACS Symposium on Structure-Activity Relationships in Heterogeneous Catalysis, April 22-27, 1990, Boston, MA, USA - Boston, MA, Verenigde Staten van Amerika
Duur: 22 apr 199027 apr 1990

Publicatie series

NaamStudies in Surface Science and Catalysis
Volume67
ISSN van geprinte versie0167-2991

Congres

CongresACS Symposium on Structure-Activity Relationships in Heterogeneous Catalysis, April 22-27, 1990, Boston, MA, USA
LandVerenigde Staten van Amerika
StadBoston, MA
Periode22/04/9027/04/90
AnderACS Symposium on Structure-Activity Relationships in Heterogeneous Catalysis ; (Boston/Mass.) : 1990.04.22-27

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  • Citeer dit

    Jansen, A. P. J., & Santen, van, R. A. (1991). Cation induced changes in chemical reactivity of small metal particles. In R. K. Grasseli, & A. W. Sleight (editors), Structure-activity and selectivity relationships in heterogeneous catalysis : proceedings of the ACS Symposium on Structure-Activity Relationships in Heterogeneous Catalysis, Boston, MA, April 22-27, 1990 (blz. 221-232). (Studies in Surface Science and Catalysis; Vol. 67). Elsevier. https://doi.org/10.1016/S0167-2991(08)61941-2