DOI: 10.1063/1.454448. Dependence of metal cluster reaction kinetics on charge state. II. Chemisorption of hydrogen by neutral and positively charged iron clusters

Dependence of metal cluster reaction kinetics on charge state. II. Chemisorption of hydrogen by neutral and positively charged iron clusters

10.1063/1.454448

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The kinetics of D2 chemisorption by gas-phase neutral (Fex ) and positively charged (Fe+x) iron clusters has been studied under identical reactor conditions. Similar to the neutrals, the reaction rate for the ions displays a nonmonotonic dependence on x, varying by more than four orders of magnitude between x = 1 and x = 31. The presence of the positive charge is found to have a substantial influence on reaction rate for the majority of clusters in the 1–31 atom size range. Clusters containing 4–6 and &gt;17 atoms experience an enhancement in rate while in contrast those containing 3 and 9–14 atoms experience a decrease in rate. Further, studies of H2 chemisorption onto Fe+x (x = 4–22) indicate an enhanced, cluster size-dependent isotope effect for the cluster ions which is quite similar to that previously observed for Fex. The effect of the positive charge on D2 chemisorption reactivity is explained within the framework of the frontier orbital model of activated chemisorption by invoking an ‘‘effective’’ activation barrier for Fe+x which incorporates the electrostatic interactions arising from the nonzero charge.

Bibliography

Zakin, M. R., Brickman, R. O., Cox, D. M., & Kaldor, A. (1988). Dependence of metal cluster reaction kinetics on charge state. II. Chemisorption of hydrogen by neutral and positively charged iron clusters. The Journal of Chemical Physics, 88(10), 6605â6610.

Authors 4

M. R. Zakin (first)
R. O. Brickman (additional)
D. M. Cox (additional)
A. Kaldor (additional)

References 33 Referenced 55

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:10 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 3:08 a.m.)
Indexed	1 year ago (Aug. 2, 2024, 9:10 a.m.)
Issued	37 years, 3 months ago (May 15, 1988)
Published	37 years, 3 months ago (May 15, 1988)
Published Print	37 years, 3 months ago (May 15, 1988)

Funders 0

None

BibTeX

@article{Zakin_1988, title={Dependence of metal cluster reaction kinetics on charge state. II. Chemisorption of hydrogen by neutral and positively charged iron clusters}, volume={88}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.454448}, DOI={10.1063/1.454448}, number={10}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Zakin, M. R. and Brickman, R. O. and Cox, D. M. and Kaldor, A.}, year={1988}, month=may, pages={6605–6610} }

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