Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (7): 1279.

• Articles • Previous Articles     Next Articles

Growth of Silicalite-2 Zeolite Film in Microchannels of Biomorphic Porous SiC Ceramics

LUO Min1,2*, LIANG Jun2, FANG Jun-Zhuo1, WANG Zheng1   

  1. 1. Key Laboratory of Energy Resources and Chemical Engineering,
    2. Department of Chemical Science and Engineering, Ningxia University, Yinchuan 750021, China
  • Received:2008-10-07 Online:2009-07-10 Published:2009-07-10
  • Contact: LUO Min. E-mail: luominjy@nxu.edu.cn
  • Supported by:

    国家“九七三”计划(批准号: 2007CB216402), 教育部科学技术研究重点项目(批准号: 203143)和宁夏高等学校科研项目资助.

Abstract:

Aligned Silicate-2 zeolite membrane was synthesized by in situ seeding and secondary crystal growth in microchannels of biomorphic porous SiC ceramics support. The Silicate-2/SiC composite materials were characterized by XRD, SEM and BET. The effects of synthesis temperature and seed surface pre-treatment of the beech-derived SiC monolith were studied. The results show that a homogeneous coverage of 5 μm thick zeolite membrane within the pores channel of SiC monolith by Silicate-2 crystals was reached after in situ seeding at 120 ℃ for 36 h with a following hydrothermal treatment at 170 ℃ for 36 h. The film oriented with [101] axis perpendicular to the substrate surface. The structure composites exhibit a hierarchical pore structure with a BET specific surface area of 43.2 m2/g and microporous volume of 0.013 cm3/g. The weight percent of Silicate-2 in the final Silicate-2/SiC composites is about 9.5% after a coating procedure.

Key words: Biomorphous porous SiC ceramics; Zeolite membrane; Silicalite-2; In situ seed and secondary crystal growth

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