首页 | 官方网站   微博 | 高级检索  
     

偏高岭土合成4A沸石机理的研究
引用本文: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.
作者姓名:王建  董家禄  刘杨  须沁华
作者单位:南京大学化学化工学院,南京,210093
摘    要:用XRD、FT IR、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  晶化机理
收稿时间:3/8/1999 12:00:00 AM
修稿时间::

Studies on the Mechanism of Synthesis of Zeolite 4A from Metakaolinite
WANG Jian,DONG Jia-Lu,LIU Yang and XU Qin-Hua.Studies on the Mechanism of Synthesis of Zeolite 4A from Metakaolinite[J].Chinese Journal of Inorganic Chemistry,2000,16(1):31-36.
Authors:WANG Jian  DONG Jia-Lu  LIU Yang and XU Qin-Hua
Affiliation:Institute of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093,Institute of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093,Institute of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 and Institute of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093
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
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《无机化学学报》浏览原始摘要信息
点击此处可从《无机化学学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司    京ICP备09084417号-23

京公网安备 11010802026262号