硅源预处理对合成高硅NaY分子筛的影响

摘要

Y型分子筛是催化裂化催化剂的主要活性组分，提高Y型分子筛的硅铝比对于改善Y型分子筛的使用性能具有重要的作用。研究硅源预处理方法对合成NaY分子筛的影响，较常规方法合成的NaY分子筛比较，硅铝比提高0．4％，结晶度合格，单釜产率提高3％。对高硅NaY进行表征，产品具有纯的FAU沸石物相、晶粒度为2．28μm和BET比表面积达到688m^2／g的小晶粒高硅NaY分子筛。%Zeolite Y is the most important active component of FCC catalysts. It is well known that the performance of Y zeolite could be greatly improved by increasing its silica to alumina ratio (SIO2/Al2O3). The impact of the pretreament method of silica source on the synthesis of NaY zeolite is introduced, relative crystallinity above 95 % and SIO2/Al2O3 ratio 0.4 higher than the conventional synthesis of NaY, the yield of the zeolite Y reaches 14 % (wt). The high silica NaY has pure FAU zeolite phase, grain size of 2.28 μm and BET specific surfuace area of 688 m^2/g.