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慢三儿木虫 (小有名气)
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[交流]
求救：不含模板剂制备zsm-5
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| 请问有没有人不用有机胺模板剂合成zsm-5分子筛的？ |
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buffaloli
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Microporous and Mesoporous Materials Volume 92, Issues 1-3, 20 June 2006, Pages 181-188 Organic-free synthesis of ZSM-5 with narrow crystal size distribution using two-step temperature process Shin Dong Kim, Si Hyun Noh, Jun Woo Park, Wha Jung Kim * Department of Materials Chemistry and Engineering, Konkuk University, 1-Hwa Yang Dong, Kwang Jin Gu, Seoul 143-701, Republic of Korea Received 3 May 2005; received in revised form 5 January 2006; accepted 10 January 2006 Abstract The MFI type of highly silica zeolite, ZSM-5 with well-defined crystal morphology was successfully synthesized in the absence of organic template using two-step temperature process. In this process, the crystallization process was conducted at two different temperatures by separating the nucleation and crystallization stage; that is, the nucleation stage at higher temperature (190 C) to accelerate the nucleation followed by the crystallization stage at lower temperature (150 or 165 C) so as to control the crystal size and size distribution. The effect of nucleation rate on the final crystal size and size distribution adopting higher temperature of the first stage for nucleation than that of the second stage for crystallization was investigated. The results show that two-step temperature process could control the crystal size and size distribution of ZSM-5. The result also shows that the time duration at higher temperature for the acceleration of nucleation strongly affects the crystal size and size distribution. It implies that rapid nucleation at higher temperature forms large number of nuclei followed by slow crystal growth probably due to the lack of energy at lower temperature. It is very critical, therefore that the optimum time duration at higher temperature should be chosen to accelerate the nucleation within initial stage. [ Last edited by buffaloli on 2008-5-29 at 14:31 ] |
8楼2008-05-29 14:18:38
jinchangzi
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2楼2008-05-28 08:39:56
feifeichong
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3楼2008-05-28 11:03:50
zhangsh04
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4楼2008-05-28 11:25:48
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