DOI: 10.1063/1.454375. Dissociative adsorption of alkanes on Ni(100): Comparison with molecular beam results

Dissociative adsorption of alkanes on Ni(100): Comparison with molecular beam results

10.1063/1.454375

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The dissociative adsorption of ethane, propane, and n-butane on Ni(100) has been investigated at pressures of 0.1–0.001 Torr and temperatures between 350 and 500 K. Activation energies for dissociation are found to be 9.5 kcal/mol for ethane, 3.8 kcal/mol for propane, and 3.1 kcal/mol for n-butane. Dissociative sticking probabilities increase with increasing carbon chain length. Comparison of the present results with the results of a recent molecular beam study of alkane dissociation on Ni(100) show very poor agreement. The sticking probabilities measured here are all orders of magnitude higher than those predicted from the molecular beam study. The discrepancy is attributed to the behavior of alkane molecules with very low normal kinetic energies, which have sticking probabilities below the limits of detection of the beam experiment. C2 H6 and C2 D6 have identical dissociative sticking probabilities indicating that quantum tunneling of hydrogen is not an important step in ethane dissociation. Dissociation is proposed to occur via a trapped molecular precursor. The measured alkane dissociation rates compare favorably with hydrogenolysis and steam reforming rates.

Bibliography

Sault, A. G., & Goodman, D. W. (1988). Dissociative adsorption of alkanes on Ni(100): Comparison with molecular beam results. The Journal of Chemical Physics, 88(11), 7232â7239.

Authors 2

Allen G. Sault (first)
D. Wayne Goodman (additional)

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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, 2:58 a.m.)
Indexed	1 year, 2 months ago (June 12, 2024, 5:56 p.m.)
Issued	37 years, 3 months ago (June 1, 1988)
Published	37 years, 3 months ago (June 1, 1988)
Published Print	37 years, 3 months ago (June 1, 1988)

Funders 0

None

BibTeX

@article{Sault_1988, title={Dissociative adsorption of alkanes on Ni(100): Comparison with molecular beam results}, volume={88}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.454375}, DOI={10.1063/1.454375}, number={11}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Sault, Allen G. and Goodman, D. Wayne}, year={1988}, month=jun, pages={7232–7239} }

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