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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Effects of step-change of synthesis temperature on synthesis of zeolite 4A from coal fly ash
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Effects of step-change of synthesis temperature on synthesis of zeolite 4A from coal fly ash

机译：合成温度阶跃变化对粉煤灰合成4A沸石的影响

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摘要

Pure form,single phase and high crystalline zeolite 4A samples were synthesized by applying step-change of synthesis temperature during hydrothermal treatment of coal fly ash prepared solution.The results indicate that step-change of synthesis temperature during hydrothermal treatment plays an important role in reducing the overall synthesis time while maintaining a high degree of crystallinity for the samples.In order to obtain similar quality of zeolite 4A sample,a reduction by half of the total synthesis time could be achieved by applying step-change of synthesis temperature compared to using constant temperature throughout the synthesis process.Generally,the crystallinity of the synthesized zeolite 4A samples was in the range of 75-87%.The yielding (quantity) of pure zeolite 4A samples obtained in all the experiments was about 15-18%.In addition,crystals of smaller particle size existing in a narrower particle size distribution were synthesized.
机译：在粉煤灰制得的溶液进行水热处理时，通过合成温度的阶跃变化合成了纯形式，单相和高结晶度沸石4A样品。结果表明，在水热处理过程中，合成温度的阶跃变化对降低粉煤灰起着重要作用。为了获得相似质量的4A沸石样品，与使用恒定温度相比，采用合成温度的阶跃变化可以将总合成时间减少一半，从而获得了相同质量的4A沸石样品。通常，合成的4A沸石样品的结晶度在75-87％的范围内。在所有实验中获得的纯沸石4A样品的产率（量）为15-18％左右。合成了存在于较窄粒度分布中的较小粒度的晶体。

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