EXHAUST EMISSION CONTROL CATALYST AND HONEYCOMB CATALYST STRUCTURE FOR EXHAUST EMISSION CONTROL

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PROBLEM TO BE SOLVED : To provide an exhaust emission control catalyst and a honeycomb catalyst structure for exhaust emission control which obtain enough lifetime and have excellent durability even under severe environment such as high temperature. SOLUTION : The exhaust emission control catalyst is provided which has a surface precipitation membrane on a base material particle carrying noble metal, and which is characterized in that : a component of the surface precipitation membrane contains cerium hydroxide alone or ceria alone, or yttrium and hydroxide of at least one or more rare-earth selected from rare-earth element with atomic number 57 to 71 (excluding cerium and promethium) or oxide of the rare-earth, aluminum hydroxide or alumina or silica; and the base material particle is ceria-zirconia-based complex oxide, zirconia, yttria-stabilized zirconia, or alumina. The honeycomb catalyst structure for exhaust emission control is provided in which metal or a ceramic honeycomb inner wall is coated with the exhaust emission control catalyst. SELECTED DRAWING : Figure 1 COPYRIGHT : (C)2017, JPO&INPIT