EU⁃1分子筛的合成及其在正己烷异构化反应中的催化性能

Synthesis and catalytic activity in n⁃hexane isomerization of EU-1 zeolite

在不同硅铝比(n SiO_(2)/n Al2O_(3))的合成凝胶(含纯硅凝胶)中引入晶种,合成了纯相的EU‐1分子筛。研究了铝源、模板剂和晶种添加量对EU‐1分子筛的结晶度、形貌尺寸等的影响;重点研究了不同硅铝比对样品结晶度、晶粒尺寸、酸性、比表面积和孔容等的影响。将合成结果绘制成了纯相EU‐1分子筛的合成条件三元图,从三元图可看出,晶种法可显著扩大纯相EU‐1分子筛的合成区域。将Pt/H‐EU‐1用于正己烷异构化反应,结果表明,该催化剂具有优异的正己烷异构化活性及稳定性,对异构烷烃有较高的选择性。

In this study,a series of pure‑phase EU‑1 zeolites were synthesized by introducing seeds into a series of synthetic gels with different SiO_(2)/Al2O_(3) ratios(nSiO_(2)/nAl2O_(3),containing pure silicon gel).The effect of the aluminum source,the amount of template and seed on the crystallinity,and the morphology and size of EU‑1 zeolite were investigated.The effects of different SiO_(2)/Al2O_(3) ratios synthesis systems on the crystallinity,crystal size,acidic property,specific surface area,and pore volume of the samples were emphatically studied.Pure phase EU‑1 was synthesized not only in a high‑silicon system but also in an aluminum‑free system by the seeding method.The results were plotted into a ternary plot of the synthesis conditions of pure phase EU‑1 zeolite.It is obvious from the ternary plot that the crystal seed method can significantly expand the synthesis region of pure phase EU‑1 zeolite.Pt/H‑EU‑1 was applied to catalyze the n‑hexane isomerization reaction.The results showed that the catalyst had excellent n‑hexane isomerization activity and stability,and high selectivity to isoparaffins.