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Rapid Production of Hydrogen and Carbon Monoxide via the Heterogeneous Oxidation of Zn(g)

[+] Author Affiliations
Luke J. Venstrom, Jane H. Davidson

University of Minnesota, Minneapolis, MN

Paper No. ES2012-91136, pp. 1101-1108; 8 pages
  • ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology
  • ASME 2012 6th International Conference on Energy Sustainability, Parts A and B
  • San Diego, California, USA, July 23–26, 2012
  • Conference Sponsors: Advanced Energy Systems Division, Solar Energy Division
  • ISBN: 978-0-7918-4481-6
  • Copyright © 2012 by ASME


The heterogeneous oxidation of Zn(g) is considered as an improved approach to the production of H2 and CO in the two-step Zn/ZnO solar thermochemical cycle. The rate of Zn(g) oxidation by H2O and CO2 is measured gravimetrically in a quartz tubular flow reactor for temperatures between 800 and 1150 K, Zn(g) concentrations up to 36 mol%, and H2O/CO2 concentrations up to 45 mol%. The rate of the heterogeneous oxidation of Zn(g) by both H2O and CO2 is on the order of 10−8–10−5 mol cm−2 s−1. For similar oxidizing conditions, H2O oxidizes Zn(g) three times as fast as CO2, indicative of a lower heterogeneous oxidation activation energy in the H2O system. Less than one second is required to convert more than 85% of Zn to ZnO for all temperatures in both the H2O and CO2 reacting systems.

Copyright © 2012 by ASME
Topics: Carbon , Hydrogen , oxidation



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