A method for increasing the surface area of perovskite-type oxides

摘要

A method based on hydrothermal treatments is described for increasing the surface area of sintered ABO_3-type perovskite oxides. Influence of hydrothermal treatments, such as water treatment at 125-300deg.C under autogeneous pressure and steam treatment at 350-800deg.C, to low surface area 9or sintered) LaCoo_3 and LaMnO_3 perovskite oxides on their surface properties (viz. Surface area, crystal size and morphology and surface La/(Co or Mn) ratio) and also catalytic activity in complete combustion of methane at different temperatures (450-600deg.C) has been thoroughly investigated. The hydrothermal treatments result in the activation of the perovskite oxides by increasing their surface area very markedly.