Abstract
YBa 2Cu 3O x, known as a high-Tc superconductor, was used as an electroconductive catalyst and its characteristics in CO oxidation were investigated. Charging 3 V, direct current, heated YBa 2Cu 3O x up to about 500°C, at which it could catalyze CO oxidation. Thus, this oxide has proper features required for electrically temperature-controlled combustion catalysts: one is self-heating property caused by electric current (Joule's heat) and the other is catalytic activity for combustion. The catalytic activity of YBa 2Cu 3O x was greatly affected by the oxygen deficiency in the solid which was directly related to the partial pressure of oxygen in the reaction system.
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