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Citation: 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[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 829-834. doi: 10.3866/PKU.WHXB20090513 shu

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

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 Date: 18 November 2008
Available Online: 10 March 2009

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 od 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.
- SAPO-5 molecular sieve,
- Microwave radiation,
- Si/Al molar ratio,
- Crystallinity,
- Aspect ratio,
- Toluene adsorption
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