Abstract
The gasification of carbon to CO without the production of nitrogen was studied using an oxide ionic and electronic mixed conductor. The oxide ionic and electronic mixed conductor CaTi0.75Fe0.25O3–α was used as a selective oxygen permeable diaphragm. The selective electrochemical permeation of oxygen across a ceramic sample was confirmed by measuring oxygen evolution rate at the low PO2 side of the oxygen gas concentration cell using sample ceramics as a diaphragm. The gasification of carbon black to CO using this diaphragm was examined. It was observed that CO and CO2 were formed without nitrogen when the opposite side of diaphragm was exposed to air at high temperature. The dependence of the CO/CO2 ratio on the partial pressure of oxygen in the high PO2 compartment and on the thickness of diaphragm was examined.
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