| 摘要 |
<p>Disclosed are high purity low-silica faujasite type zeolite showing a faujasite single phase on X-ray diffraction, having a SiO2/Al2O3 molar ratio of 1.9 to 2.1 and a water adsorption of 35.0% by weight or more when converted to the Na type, and comprising particles having smaller primary particle size and particles having larger primary particle size, wherein the primary particle size of the smaller particles is from 1 mu m to 8 mu m, the primary particle size of the larger particles is from 5 mu m to 15 mu m, and the particles having smaller primary particle size accounts for 90% or more of the total particle number; and a method for producing low-silica faujasite type zeolite having a SiO2/Al2O3 molar ratio of 1.9 to 2.1 by mixing an aluminate-containing solution with a silicate-containing solution to allow the resulting solution to gel, followed by aging and crystallization, wherein besides zeolite formed, "zeolite" is added before the termination of the aging, thereby producing the low-silica faujasite type zeolite in high purity on a large scale for a short period of time.</p> |
