Catalyst block

A catalyst block for purification of exhaust gas comprising:

• a rigid rectangular honeycomb core having a large number of exhaust gas passages for the honeycomb core allowing exhaust gas to pass, first and second outer surfaces that face to each other in an orthogonal direction that is orthogonal to the exhaust gas passages, and third and fourth outer surfaces that face to each other in the orthogonal direction;
• a first plate attached to the first outer surface;
• a second plate attached to the second outer surface;
• and
• an outer frame that is disposed along an outer periphery of the honeycomb core, the first plate, and the second plate, and includes a concave part housing at least the first plate, the second plate, the third outer surface, and the fourth outer surface, wherein
• a catalyst is carried on the honeycomb core, the first plate, and the second plate, and the catalyst is not carried on the outer frame,
• wherein the first plate is only fixed to the outer frame in the concave port and the second plate, third outer surface and the fourth outer surface are not fixed to the outer frame in the concave part.