| 摘要 |
There is provided a DDR-type zeolite powder composed of fine particles and exhibits a particle size distribution where the majority of the particles have particle diameters converging in the vicinity of the mean particle diameter, and a process for the production of the same. Specifically provided is a process for the production of a DDR-type zeolite powder, which comprises a step of heat-treating a raw material solution at 100 to 180°C, and thereby growing crystals until the mean particle diameter reaches to a level of 0.1 µm or more and below 2.5 µm. The raw material solution comprises a mixture consisting of a solution of 1-adamantanamine in ethylenediamine, silica (SiO 2 ), and water at a 1-adamantanamine/SiO 2 molar ratio of 0.002 to 0.5 and a water/SiO 2 molar ratio of 10 to 500; and DDR-type zeolite seed crystal having a mean particle diameter of 10 to 300 mm are dispersed in the raw material solution in an amount of 0.001 to 1.0 mass%. The DDR-type zeolite seed crystals act as nuclei for crystal growth in the above step. |
