Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (05): 829-834.doi: 10.3866/PKU.WHXB20090513

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Effects of Si/Al Molar Ratio on the Crystallinity and Toluene Adsorption of SAPO-5 Synthesized under Microwave Radiation

HAO Zhi-Xian, ZHAO Hai-Tao, WANG Li-Jun, XIE Li-Li, TIAN Zhen, LI Qing-Hua   

  1. Department of Chemistry, Tongji University, Shanghai 200092, P. R. China; 2School of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai 201209, P. R. China
  • Received:2008-11-18 Revised:2009-01-30 Published:2009-05-04
  • Contact: HAO Zhi-Xian WANG Li-Jun E-mail:haozhixian@tongji.edu.cn; ljwang@eed.sspu.cn

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Abstract:

SAPO-5 molecular sieves were synthesized using high pressure microwave radiation and at pH=4.5-5.0. Effects of silica/alumina (Si/Al) molar ratios of the initial reaction sol-gel on the aspect ratio (c/a) of resulting crystal particles and the toluene adsorption capability of the products were investigated. X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) surface area analyses showed that good crystallinity and low crystal aspect ratio were apparent at a Si/Al molar ratio of 0.50. The highest toluene adsorption rate and quantity was obtained at around the same Si/Al molar ratio of 0.50. BET surface areas were approximately constant despite the products were obtained under the reaction conditions of different Si/Al molar ratios. The agreement obtained from the characterization and adsorption indicates that SAPO-5 molecular sieves with high crystallinity and low aspect ratio are valuable for toluene adsorption.

Key words: SAPO-5 molecular sieve, Microwave radiation, Si/Al molar ratio, Crystallinity, Aspect ratio, Toluene adsorption