Abstract: This work describes a novel method to synthesize NaY zeolite at high temperature(100—140 ℃) by using NaY seeds solution as a silica source, which is also a method for the activation of silica source in the synthesis of NaY zeolite. Conventionally, the synthesis temperature of NaY zeolite from water glass is about 100 ℃, and higher temperature(>100 ℃) leads to the formation of impurity. However, this work shows that high-temperature synthesis(100—140 ℃) still exhibits a pure phase NaY. It is very interesting that, compared with conventional temperature, high-temperature in the synthesis of NaY zeolite has obvious advantages such as short crystallization time and high n(Si)/n(Al) ratio in the product. More importantly, this method is possible to extend to the synthesis of NaA, NaX, Ω, ECR-1and MOR.

Key words: NaY zeolite, Activation of silica source, Guidance agent of crystallization