| 偏高岭土合成4A沸石机理的研究 |
| Studies on the Mechanism of Synthesis of Zeolite 4A from Metakaolinite |
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| 摘要: 用XRD、FTIR、ICP、SEM、化学分析等方法研究了偏高岭土合成4A沸石的晶化反应机理。偏高岭土在NaOH溶液中部分溶解,且结构迅速转变为偏高岭土*,并伴有硅铝酸钠凝胶形成。偏高岭土*也不断在碱液的作用下凝胶化,生成的凝胶进一步再转变为4A沸石,这两个过程在大部分反应时间里是同时进行的,直到晶化结束。液相参与凝胶、4A沸石前驱及晶核等的形成和4A沸石的成长。偏高岭土*的凝胶化速度是整个晶化过程的决定步骤,该晶化过程极易形成大量聚晶。 |
| 关键词: 4A沸石 合成 偏高岭土 碱处理 晶化机理 |
| 基金项目: 国家科委863项目 |
| Abstract: XRD, FT-IR, ICP, SEM and chemical analysis have been used to examine the mechanism of the synthesis of zeolite 4A from metakaolinite. When metakaolinite treated with NaOH solution, it is rapidly converted into metakaolinnite*. The processes of gelation of metakaolinite* and the crystallization of zeolite 4A from such gel are slow and simultaneous till the end of the crystallization. Liquid phase all takes an active part in the gelation of metakaolinite*, the formation of zeolite precursor and nucleation and the growth of zeolite 4A. The step that determines the rate of the zeolite crystallization process is the gelation of metakaolinite*. This crystallization process of zeolite 4A from metakaolinnite easily leads to form large numbers of polycrystals. |
| Keywords: zeolite 4A synthesis metakaolinnite crystallization mechanism alkaline treatment |
| 投稿时间：1999-03-08 修订日期：1999-09-06 |
| 摘要点击次数: 1296 |
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| 王建,董家禄,刘杨,须沁华.偏高岭土合成4A沸石机理的研究[J].无机化学学报,2000,16(1):31-36. |
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