Dynamic synthesis route of zeolite y with kaolin to improve yield

Abstract

Zeolite NaY was successfully synthesized by a dynamic hydrothermal crystallization method with water glass and kaolin from Yunnan Provice of China. The products were modified to serve as hydrocracking catalysts. The influences of aging conditions of the structure-directing agent and crystallization methods were examined. The compositions and microstructures of zeolites were characterized by field emission scanning electron microscopy, X-ray diffraction and Brunauer-Emmett-Teller (BET). The catalytic performance for hydrocracking was briefly evaluated. The results showed that appropriate aging temperature and time of structure-directing agent were beneficial to nucleation. Combined with static crystallization, the yield of zeolite NaY prepared by the dynamic crystallization method was significantly improved, relative crystallinity increased from 46.91% to 74.18%, and conversion in hydrocracking accordingly increased from 39.58% to 55.93%.