| 摘要 |
PURPOSE: To obtain a catalyst having superior high-temp. durability. CONSTITUTION: A catalyst 11 made of a mixture of a crystalline aluminosilicate with a catalytic element is carried on a honeycomb body 2. The crystalline aluminosilicate has an irregular crystal structure formed by lacking part of the constituent elements of a crystalline aluminosilicate having a regular crystal structure and the single lattice volume (V1 ) of the irregular crystal structure calculated from the crystal lattice constant by an X-dry diffraction method is made smaller than the single lattice volume (V1 ) of the regular crystal structure calculated from the crystal lattice constant by an X-ray diffraction method (V1 <V2 ). The crystalline aluminosilicate of the catalyst 11 withstands 1,000 deg.C and has function to adsorb hydrocarbons at low temp. as well as superior heat resistance. The catalytic element consists of Al2 O3 particles and Pd carried on the particles. |
