With the perovskite-type oxide catalysts such as LaCoO_(3), Ce-, Th-, Sr- or Ba-substituted LaCoO_(3) and A-site vacant LaCoO_(3), a study was performed on the catalytic activities and the properties of the active sites for CO oxidation, which is one ...
With the perovskite-type oxide catalysts such as LaCoO_(3), Ce-, Th-, Sr- or Ba-substituted LaCoO_(3) and A-site vacant LaCoO_(3), a study was performed on the catalytic activities and the properties of the active sites for CO oxidation, which is one of the principal reactions of automobile exhaust control. The active sites were Co^(4+) for CO oxidation. Ce- or Th-substituted LaCoO_(3) and A-site vacant LaCoO_(3) showed high activities for CO oxidation. Calcination of the catalyst at higher temperature reduced Co^(4+) with decreasing the activities for CO oxidation. LaCoO_(3) with some A-site vacancies was highly active in CO oxidation.