Honeycomb structure and manufacturing method of the honeycomb structure

A manufacturing method of a honeycomb structure comprising at least one honeycomb unit, the method comprising:

• providing a raw material paste comprising an inorganic binder and inorganic particles including zeolite so that the at least one honeycomb unit includes at least approximately 230 g/L of zeolite, L representing an apparent volume;
• providing a die;
• extrusion molding the raw material paste into at least one honeycomb unit molded body using the die;
• sintering the at least one honeycomb unit molded body to be the at least one honeycomb unit having a longitudinal direction and a plurality of cell walls extending from a first end to a second end of the at least one honeycomb unit along the longitudinal direction to define cells;
• designing the die so that the at least one honeycomb unit molded body has predetermined sizes of the cells and predetermined thicknesses of the cell walls, thereby providing the at least one honeycomb unit which has an opening ratio (P) of at least approximately 50% and at most approximately 65% and a cell density ρ of at least approximately 31/cm2 and at most approximately 93/cm2;
• and
• adjusting a surface roughness of a surface of the die so that a surface roughness Ra of the cell walls of the at least one honeycomb unit is at least approximately 1 μm and at most approximately 30 μm.