Acta Chimica Sinica ›› 1996, Vol. 54 ›› Issue (6): 591-597. Previous Articles     Next Articles

Original Articles

化学液相沉积法调变沸石孔径及异构体择形分离

乐英红;唐颐;阚勇志;高滋   

  1. 复旦大学化学系
  • 出版日期:1996-06-15 发布日期:1996-06-15

Pore size control of NaY zeolite by chemical liquid deposition and shape-selective separation

LE YINGHONG;TANG YI;KAN YONGZHI;GAO ZI   

  • Online:1996-06-15 Published:1996-06-15

The pore-opening size of NaY zeolite was finely controlled by chemical liquid deposition method. By reacting silicon alkoxide with the adsorbed water or surface hydroxyl group of the zeolite, a thin layer of silica was deposited on the external surface and narrowed the pore-opening size of the zeolite effectively. A series of NaY zeolite samples with different amount of silica deposition (SiNaY) were prepared and characterized by IR spectroscopy and adsorption measurements. It was found that after deposition and calcination the zeolite framework structurre, pore volume and internal surface properties were essentially unaltered. The shape-selective separation of p-xylene/1, 3, 5-trimethylbenzene, 2-methylnaphthalene/1-methyl- naphthalene, 1, 2, 4-trimethylbenzene/1, 3, 5-trimethylbenzene, p- xylene/m-xylene and p-cresol/m-cresol liquid mixtures with difference molecular dimensions on SiNaY was investigated. The separation of mixture isomers with molecular diameters close to the pore size of the zeolite can be achieved successfully.

Key words: CRESOL, INFRARED SPECTROPHOTOMETRY, ZEOLITE, DIMETHYLBENZENE, ADSORPTION, SILICON OXIDE, TRIMETHYLBENZENE, METHYLNAPHTHALENE

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