Honeycomb catalytic converter

A honeycomb catalytic converter comprising:

• a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween;
• a noble metal supported on the honeycomb structured body;
• and
• an inlet-side end face and on outlet-side end face,
• wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal,
• an aperture ratio of the inlet-side end face is higher than an aperture ratio the outlet-side end face, and
• wherein the honeycomb catalytic converter has a length to diameter ratio (length/diameter) of 0.5 to 1.1.

A honeycomb catalytic converter comprising:

• a honeycomb structured body in which multiple through-holes are arranged longitudinally in parallel with one another with a partition wall therebetween;
• a noble metal supported on the honeycomb structured body;
• and
• an inlet-side end face and on outlet-side end face,
• wherein each partition wall includes a substrate portion in the form of an extrudate containing a ceria-zirconia complex oxide and alumina, and a coat layer formed on a surface of the substrate portion and containing the noble metal,
• an aperture ratio of the inlet-side end face is higher than an aperture ratio the outlet-side end face, and
• wherein the honeycomb catalytic converter has a diameter of 130 mm or less.