Influence of Trace Impurities on Oxygen Activity for High Purity Nitrogen Gas Processed by Zirconia Oxygen Pump

DOI:10.15011/jasma.33. 330214
Int. J. Microgravity Sci. Appl. 2016p330214
Author
Shumpei OZAWA, Yuki KAWANOBE, Kazuhiko KURIBAYASHI and Toru NAGASAWA
Organization
Department of Mechanical Science and Engineering, Chiba Institute of Technology, Canon Machinery INC
Abstract
Oxygen activity (a_(o_2 )) of high purity nitrogen gas was controlled and monitored by a zirconia oxygen pump and sensors operated at 600 °C. It was confirmed that the oxygen pump and sensors can control the a_(o_2 ) at 600 °C precisely. Solid metal samples of copper, nickel and iron were actually oxidized under the processed gas when the indicated value of the a_(o_2 ) is higher than the equilibrium oxygen activity for formation of the metal oxides. When the indicated value of a_(o_2 ) is lower than the equilibrium oxygen activity for formation of the oxides, the samples were reduced. The processed gas showed a temperature reliance induced from the gas phase equilibrium between the H2 and H2O gases, which were contained in the source gas as an impurity.
Keyword(s)
Zirconia oxygen pump, Zirconia oxygen sensor, Oxygen activity, Solid electrolyte, Gas phase equilibrium
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Received 20 October 2015, Accepted 5 March 2016, Published 30 April 2016

© The Japan Society of Microgravity Applicaiton

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