Amorebieta, V. T. and Colussi, A. J. (1999) Exclusive Formation of C^(16)O in the Prompt Oxidation of Carbon Films by ^(18)O_2 on Sm_2^(16)O_3. Implications for the Mechanism of Oxygen Activation. Langmuir, 15 (8). pp. 2617-2619. ISSN 0743-7463. doi:10.1021/la981517f. https://resolver.caltech.edu/CaltechAUTHORS:20150623-154800549
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Abstract
The oxidation of carbon films on Sm_2^(16)O_(3-γ) exposed to ∼1 Langmuir/s ^(18)O_2 at 1100 K solely yields C^(16)O while the substrate is quantitatively capturing oxygen. This is evidence that chemisorbed ^(18)O scrambles its label with the catalyst before oxidizing carbon or diffusing into the bulk oxide. O-diffusion coefficients measured in samaria under present conditions (D_O ≥ 8 × 10^(-9) cm^2 s^(-1) above 1000 K) imply that scrambling is complete in a few nanoseconds. We infer that dissociative ^(18)O_2 chemisorption is assisted by the concomitant restructuring of extended surface regions, on which carbon films are oxidized by the statistically preponderant unlabeled oxygen species.
| Item Type: | Article | |||||||||
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| Additional Information: | © 1999 American Chemical Society. Received October 27, 1998. In Final Form: February 17, 1999. This work was financially supported by FONCYT/CONICET of Argentina. | |||||||||
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| Issue or Number: | 8 | |||||||||
| DOI: | 10.1021/la981517f | |||||||||
| Record Number: | CaltechAUTHORS:20150623-154800549 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150623-154800549 | |||||||||
| Official Citation: | Exclusive Formation of C16O in the Prompt Oxidation of Carbon Films by 18O2 on Sm216O3. Implications for the Mechanism of Oxygen Activation V. T. Amorebieta and and A. J. Colussi Langmuir 1999 15 (8), 2617-2619 DOI: 10.1021/la981517f | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 58494 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 28 Jul 2015 19:42 | |||||||||
| Last Modified: | 10 Nov 2021 22:06 |
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