| 摘要 |
PURPOSE: To obtain an oxidation catalyst having high catalytic activity over the wide temp. range from a low temp. to a high temp. by imparting a pyrochlore structure to a metal oxide having a specified compsn. CONSTITUTION: This oxidation catalyst is an oxide having a compsn. represented by the formula (M1-x Cex )2 Sn2 O7 (where M is Ca or Sr and x≠0) and a pyrochlore structure. For example, CeO2 is wet or dry-mixed with SnO2 and MCO3 and this mixture is fired at about 1,000-1,600 deg.C in air to form the pyrochlore structure by a solid phase reaction. The resultant catalyst has high oxidation activity even at a low temp. and can be utilized for oxidation of CO or hydrocarbon such as methane or complete oxidation of an org. chlorine compd., etc.
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