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Influence of alkalinity of the starting system on size and morphology of the zeolite A crystals

机译：起始体系碱度对A沸石分子筛尺寸和形貌的影响

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The performance of zeolite crystals in different industrial processes often depends on their size and shape. Several physico-chemical parameters can have significant impact on their paniculate properties (especially morphology). Amongst the chemical parameters the Si/Al ratio is one of most important variable together with the Na~+ ions (alkalinity) content. The present study is devoted to the effect of Na on the morphology of zeolite A (LTA-type) crystals. Initial hydrogels were heated at 80 ℃ in reactors made of HDPE, under static conditions. After separation by centrifugation, samples of solid and liquid phase were characterized using several analytical methods such as: atomic absorption spectroscopy, X-ray diffraction, laser light scattering, optical, scanning and transmission electron microscopy. The results show that the increase of alkalinity in starting system causes two effects: (a) increase of the number of nuclei (crystals) in system through additional nucleation at surface and subsurface area of gel particles, and (b) the growth of crystals which have more irregular shape (rounded edges).
机译：沸石晶体在不同工业过程中的性能通常取决于其尺寸和形状。几个物理化学参数可能会对它们的颗粒特性（尤其是形态）产生重大影响。在化学参数中，Si / Al比与Na〜+离子（碱度）含量一起是最重要的变量之一。本研究致力于Na对沸石A（LTA型）晶体形态的影响。在静态条件下，将初始水凝胶在HDPE制成的反应器中于80℃加热。离心分离后，使用几种分析方法对固相和液相样品进行表征，例如原子吸收光谱法，X射线衍射，激光散射，光学，扫描和透射电子显微镜。结果表明，起始体系中碱度的增加引起两个作用：（a）通过凝胶颗粒表面和亚表面区域的附加成核作用，增加系统中核（晶体）的数量，以及（b）晶体生长具有更多不规则形状（圆形边缘）。

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