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Acta Phys. -Chim. Sin.  2009, Vol. 25 Issue (05): 829-834    DOI: 10.3866/PKU.WHXB20090513
Article     
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
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
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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 wordsSAPO-5 molecular sieve      Microwave radiation      Si/Al molar ratio      Crystallinity      Aspect ratio      Toluene adsorption     
Received: 18 November 2008      Published: 10 March 2009
MSC2000:  O647  
Corresponding Authors: HAO Zhi-Xian WANG Li-Jun     E-mail: haozhixian@tongji.edu.cn; ljwang@eed.sspu.cn
Cite this article:

HAO Zhi-Xian, ZHAO Hai-Tao, WANG Li-Jun, XIE Li-Li, TIAN Zhen, LI Qing-Hua. Effects of Si/Al Molar Ratio on the Crystallinity and Toluene Adsorption of SAPO-5 Synthesized under Microwave Radiation. Acta Phys. -Chim. Sin., 2009, 25(05): 829-834.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20090513     OR     http://www.whxb.pku.edu.cn/Y2009/V25/I05/829

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