催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (1): 192-198.DOI: 10.3724/SP.J.1088.2012.10828

• 研究论文 • 上一篇    下一篇

HCl 处理后局部有序 Y 沸石的二次晶化

宋燕梅, 任楠, 唐颐*   

  1. 复旦大学化学系, 上海市分子催化和功能材料重点实验室, 复旦催化研究所, 上海200433
  • 收稿日期:2011-08-10 修回日期:2011-09-21 出版日期:2012-01-16 发布日期:2015-05-26

Recystallization of HCl-Treated Y Zeolite with Short Range Order

SONG Yanmei, REN Nan, TANG Yi*   

  1. Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of Catalysis, Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2011-08-10 Revised:2011-09-21 Online:2012-01-16 Published:2015-05-26

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852

被引次数

5

摘要： 将商品 Y 型沸石用 HCl 处理后, 运用 X 射线粉末衍射, 透射电镜和扫描电镜、红外光谱及 27Al 和 29Si 魔角旋转核磁共振对其进行了表征. 结果表明, 酸处理后 Y 沸石接近无定形, 其长程有序性遭到破坏, 但还保留部分局部结构. 以不同浓度酸处理后的 Y 沸石为前驱体, 在 150 oC, 0.3 mol/L NaOH 条件下采用蒸汽辅助干胶转化法进行二次晶化, 可以获得丝光沸石, 其相纯度与前驱体的 Si/Al 密切相关. 随 Si/Al 比不同, 所得丝光沸石形貌由纳米针状堆积逐渐向微米单块状变化, 且其比表面积可达 400 m2/g 以上, 微孔孔容在 0.19 cm3/g.

关键词: Y 沸石, 盐酸处理, 局部有序, 丝光沸石, 蒸汽辅助干胶转化

Abstract: A series of acid-treated Y zeolite crystals with different crystallinities were obtained by treating commercial Y zeolite in HCl solution. The acid-treated Y zeolites were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, and 27Al and 29Si MAS NMR. The results indicated that the acid-treated Y zeolites were almost amorphous but some short-range-order aluminosilicate species were retained. The acid-treated Y zeolites were recrystallized at 150 oC with 0.3 mol/L NaOH solution by the steam-assist crystallization method, and the pure mordenite zeolite products with the morphology from aggregate of nano-rod to micron-sized crystal were obtained within a suitable Si/Al ratio range. Their BET surface area is higher than 400 m2/g and micropore volume is up to 0.19 cm3/g.

Key words: Y zeolite, hydrochloric acid treatment, local range order, mordenite, steam-assisted crystallization