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Influence of Alkalinity on the Synthesis of Zeolite A and Hydroxysodalite from Metakaolin

机译：碱度对偏莨菪碱合成沸石A和羟基甲醛的影响

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摘要

Kaolin is a cheap and abundant source of silica and alumina, which may be used as precursors for the production of zeolites, molecular sieves with pores in the nanometer scale. Brazil, one of the largest producers of kaolin, generates tons of kaolin waste in the paper coating process. That waste may be used to synthesize zeolite A and hydroxysodalite, greater added value materials with a wide range of applications. In this work, Zeolite A and hydroxysodalite were synthesized from kaolin waste of processing industries for paper coating. Kaolin was calcined to dehydroxylate kaolinite and obtain metakaolin, an amorphous material with Si/Al ratio equal to 1, being suitable for production of zeolite A and hydroxysodalite. Zeolites were synthesized under static hydrothermal conditions by reacting metakaolin with NaOH solutions of different concentrations. The zeolitic products were characterized by means of X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The results showed that the higher the NaOH concentration in the reaction medium, the higher the proportion of hydroxysodalite in the zeolitic samples.
机译：高岭土是二氧化硅和氧化铝的廉价且丰富的源，可用作沸石生产的前体，纳米级中的孔的分子筛。巴西是大高岭土生产商之一，在造纸过程中产生大量高岭土废物。该废物可用于合成沸石A和羟基沸石，更大的附加值材料具有各种应用。在这项工作中，沸石A和羟基氧化铝由高岭土浪费的纸涂层合成。将高岭土煅烧至脱羟基盐高岭石并获得甲醇，其具有等于1的Si / Al比的无定形材料，适用于生产沸石A和羟基甲酸酯。通过与不同浓度的NaOH溶液反应的偏塔林反应，在静态水热条件下合成沸石。通过X射线衍射（XRD），傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM），表征沸石产物。结果表明，反应介质中的NaOH浓度越高，沸石样品中羟基钴比例越高。

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  • 来源
    《Journal of nano research》 |2020年第2020期|51-60|共10页
  • 作者

    Andrades R. C.; Neves R. F.; Diaz F. R. V; Junior A. H. M.;

  • 作者单位

    Univ Sao Paulo Mat Engn Dept Polytech Sch Ave Prof Mello Moraes 2463 Sao Paulo SP Brazil;

    Fed Univ Para Chem Engn Dept Rua Augusto Correa 8856 Belem Para Brazil;

    Univ Sao Paulo Mat Engn Dept Polytech Sch Ave Prof Mello Moraes 2463 Sao Paulo SP Brazil;

    Univ Prebiteriana Mackenzie Mat Engn Dept Rua Consolacao 930 Sao Paulo SP Brazil;

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  • 正文语种 eng
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  • 关键词

    zeolite A; hydroxysodalite; metakaolin; alkalinity;

    机译：沸石A;羟基甲酸盐;咪达甘油;碱度;

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