Abstract
The heterogeneous oxidation of Zn(g) is considered as an improved approach to the production of H 2 and CO in the two-step Zn/ZnO solar thermochemical cycle. The rate of Zn(g) oxidation by H 2 O and CO 2 is measured gravimetrically in a quartz tubular flow reactor for temperatures between 800 and 1150 K, Zn(g) concentrations up to 36 mol%, and H 2 O/CO 2 concentrations up to 45 mol%. The rate of the heterogeneous oxidation of Zn(g) by both H 2 O and CO 2 is on the order of 10 -8 -10 -5 mol cm -2 s -1 . For similar oxidizing conditions, H 2 O oxidizes Zn(g) three times as fast as CO 2 , indicative of a lower heterogeneous oxidation activation energy in the H 2 O system. Less than one second is required to convert more than 85% of Zn to ZnO for all temperatures in both the H 2 O and CO 2 reacting systems.
| Original language | English (US) |
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| Pages | 1101-1108 |
| Number of pages | 8 |
| DOIs | |
| State | Published - Jan 1 2012 |
| Event | ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology - San Diego, CA, United States Duration: Jul 23 2012 → Jul 26 2012 |
Other
| Other | ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology |
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| Country/Territory | United States |
| City | San Diego, CA |
| Period | 7/23/12 → 7/26/12 |