Effect of N2O, catalyst, and means of water vapor removal on the graphitization of small CO2 samples.
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Date
2006-04-03
Journal Title
Journal ISSN
Volume Title
Publisher
University of Arizona
Abstract
The effect of nitrous oxide (N2O) Upon the graphitization of small (similar to 40 mu g of carbon) CO2 samples at the ANSTO and University of California, Irvine, radiocarbon laboratories was investigated. Both laboratories produce graphite samples by reduction of CO2 over a heated iron catalyst in the presence of an excess of H-2. Although there are significant differences between the methods employed at each laboratory, it was found that N2O has no effect upon the reaction at levels of up to 9.3% by volume Of CO2. Further, it was systematically determined that more effective water vapor trapping resulted in faster reaction rates. Using larger amounts of the Fe catalyst generally resulted in higher yields or reaction rates (but not both). The effects of changing the type of Fe catalyst on the final yield and reaction rate were less clear.
Description
Keywords
Nitrous oxide, Graphitization, Graphite, Vapors, Reaction kinetics, Carbon dioxide
Citation
Smith, A. M., Petrenko, V. V., Hua, Q., Southon, J., & Brailsford, G. (2006). Effect of N2O, catalyst, and means of water vapor removal on the graphitization of small CO2 samples. Paper presented to the 19th International Radiocarbon Conference, 3rd - 7th April 2006. Oxford, United Kingdom: Keble College. In Radiocarbon, 49(2), 245-254. doi:10.1017/S003382220004217X