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SEM/TEM Study of Zeolite Crystallization

沸石结晶的 SEM/TEM 研究

基本信息

批准号：
9103357
负责人：
Robert Thompson
金额：
$ 15万
依托单位：
Worcester Polytechnic Institute
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1991
资助国家：
美国
起止时间：
1991-09-01 至 1994-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103357&HistoricalAwards=false
关键词：
SEM TEM Study Zeolite Crystallization

项目摘要

This research program deals with understanding of the mechanisms of crystallization of molecular sieve zeolite in hydrothermal systems. Taking advantage of seeding techniques in zeolite syntheses results in somewhat larger particles, as expected and desired, but the degree of success has been limited, and the seed crystals themselves are converted into polycrystalline masses with quite irregular morphology. This ongoing project continues the zeolite synthesis research to investigate the effects of seeding zeolite crystallization systems, and to study the effects on the seed crystals themselves. While circumstantial evidence that initial breeding occurs in the seeded silicalite synthesis system has been obtained, an attempt to actually observe these by microscopic techniques is being made. An attempt is also being made to demonstrate for several zeolite systems that some of these surface-bound initial bred nuclei remain on the seed crystal surface and generate the polycrystalline masses noted above. Examination of these initial bred nuclei by scanning and transmission electron microscope is attempted. An investigation of the effects that different growth environments have on the seed crystals themselves is done by these techniques and by selected area diffraction techniques. Crystals grown using the technique of late reagent addition during a crystallization also are investigated. Lastly, zeolite crystal precipitate zeolite NaA and "Silicalite" are investigated. The crystals have potential applications in sensors and in membrane separations.

这个研究项目涉及对分子筛沸石的晶化机理热液系统利用播种技术在沸石合成中，期望和期望，但成功的程度一直是有限的，和种子晶体本身被转化为多晶块，具有非常不规则的形态。这正在进行的项目继续进行沸石合成研究，研究晶种对沸石晶化的影响系统，并研究对晶种的影响自己虽然间接证据表明，最初在接种的硅质岩合成系统中发生滋生，试图实际观察这些，显微技术正在发展。一种尝试也是被用来证明几种沸石系统，这些表面结合的初始增殖核中的一些保留在籽晶表面并产生多晶块上面提到。通过以下方法检查这些初始增殖的细胞核：扫描和透射电子显微镜进行了尝试。研究了不同生长方式对植物生长的影响，环境对晶种本身的影响是通过这些技术和通过选择区域衍射技术。采用后加试剂技术生长的晶体在结晶过程中也进行了研究。最后，沸石晶体沉淀物沸石NaA和“硅质岩”是研究了该晶体在以下方面具有潜在的应用前景：传感器和膜分离。