- Title
- Magnitude of the deuterium kinetic isotope effect during the combustion of methane over a Pd/Al₂O₃ catalyst
- Creator
- Wright, B. A.; Kennedy, E. M.; Stockenhuber, M.
- Relation
- Australian Combustion Symposium 2015. Proceedings of the Australian Combustion Symposium 2015 (Parkville, Vic. 7-9 December, 2015) p. 128-131
- Relation
- http://www.anz-combustioninstitute.org/ACS2015/
- Publisher
- Combustion Institute, Australian and New Zealand Section
- Resource Type
- conference paper
- Date
- 2015
- Description
- The deuterium kinetic isotope effect during combustion of methane (7,000 ppm in air) over a Pd/Al₂O₃ catalyst at 270 °C has been determined. The overall rate ratio, CH₄ vs CD₄ is 3.1±0.2 which was consistent with the rate ratio predicted (2.9) if the rate determining step of the reaction is largely governed by the rate of bond breaking in methane. In additional experiments involving the oxidation of humid CH₄ or CD₄ feed gases, which have been saturated in H₂O(v) or D₂O(v) respectively, the rate of reaction decreases significantly in the presence of a high concentration of water vapour (ca 12,000 ppm) but the overall rate ratio, CH₄ / H₂O(v) vs CD₄ / D₂O(v) increases only slightly, to 3.2 ±0.6. This suggests that the effect of water vapour on the reaction rate is attributable to an equilibrium isotope effect (EIE) but under all reaction conditions studied at 270 °C, the rate limiting step involves methane activation.
- Subject
- ventilation air methane; catalytic combustion; kinetic isotope effect
- Identifier
- http://hdl.handle.net/1959.13/1316254
- Identifier
- uon:23115
- Identifier
- ISSN:1839-8170
- Language
- eng
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