DOI: 10.1063/1.431559. Kinetics of CH4 formation from the reaction of H with graphite

Kinetics of CH4 formation from the reaction of H with graphite

10.1063/1.431559

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Small ribbon-shaped samples of spectroscopic grade graphite heated to between 500 and 1250 K have been exposed to atomic hydrogen produced by thermal dissociation of H2 on hot W and the rate of CH4 evolution has been measured mass spectrometrically. H2 pressures were between 1×10−6 and 5×10−5 Torr and arrival rates of H at the graphite surface ranged from 1×1014 to 5×1015 atoms cm−2 sec−1. When a well outgassed graphite surface is initially exposed to H atoms, the rate of CH4 evolution, NM, peaks and then decays to a steady-state rate. A mechanism is proposed and examined which adequately explains the results observed. The mechanism involves the formation of a CH4-producing surface complex by the reaction of an incident H atom with chemisorbed H atoms on the graphite surface. Additional chemisorbed H rapidly reacts with this complex and CH4 desorbs. The decay in NM to a steady-state evolution rate is apparently caused by a surface reaction in which pairs of the surface complexes responsible for CH4 evolution form a stable site-blocking species.

Bibliography

Gould, R. K. (1975). Kinetics of CH4 formation from the reaction of H with graphite. The Journal of Chemical Physics, 63(5), 1825â1836.

Authors 1

Robert K. Gould (first)

References 27 Referenced 62

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Dates

Type	When
Created	22 years, 6 months ago (Feb. 27, 2003, 3:57 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 9:10 a.m.)
Indexed	2 months, 2 weeks ago (June 15, 2025, 7:20 a.m.)
Issued	49 years, 11 months ago (Sept. 1, 1975)
Published	49 years, 11 months ago (Sept. 1, 1975)
Published Print	49 years, 11 months ago (Sept. 1, 1975)

Funders 0

None

BibTeX

@article{Gould_1975, title={Kinetics of CH4 formation from the reaction of H with graphite}, volume={63}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.431559}, DOI={10.1063/1.431559}, number={5}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Gould, Robert K.}, year={1975}, month=sep, pages={1825–1836} }

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