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| Preparation of silicalite–1 coating on SiC foam ceramics by support self–transformation |
| JIAO Yilai; YANG Zhenming; CAO Xiaoming ; TIAN Chong; SU Dangsheng; ZHANG Jinsong |
| Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
JIAO Yilai YANG Zhenming CAO Xiaoming TIAN Chong SU Dangsheng ZHANG Jinsong. Preparation of silicalite–1 coating on SiC foam ceramics by support self–transformation. Chin J Mater Res, 2009, 23(5): 458-465.
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Abstract Silicalite–1 coating on SiC foam ceramic was prepared by support self–transformation method using the residual silicon as silicon source. Silicalite–1/SiC foam composite with a specific surface area of 36 m2g−1 and homogeneous coverage and good thermal mechanical stability and good heat shock stability was fabricated on the SiC foam supports with a residual silicon amount of 16.7%. The influences of residual silicon amount in the supports, synthesis time and composition of the synthesis solution on the loading and morphology of the zeolite layer were investigated. It is found that the residual silicon amount is the key parameter to zeolite crystallization. Zeolite nucleus can not form on the SiC foam ceramic supports with too low amount of residual silicon, but can form on the residual silicon first when the amount is too high, which will make the zeolite crystal detached from the support during the subsequent silicon dissolution. In addition, increasing the template concentration can promote zeolite nucleation and
reduce the size of zeolite crystals.
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Received: 04 May 2009
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| Fund: Supported by National High–Tech Research and Development Program of China No.2007AA030205. |
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