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A mild conditions synthesis route to produce hydrosodalite from kaolinite, compatible with extrusion processing
Microporous and Mesoporous Materials ( IF 5.2 ) Pub Date : 2018-01-16 , DOI: 10.1016/j.micromeso.2018.01.014
A. Marsh , A. Heath , P. Patureau , M. Evernden , P. Walker

Hydrosodalites are a family of zeolitic materials which have a diverse range of possible applications such as water desalination. Typical synthesis methods are relatively complex, using hydrothermal production and pre-processing and it is desirable to use lower energy and more cost-effective processing routes. For the first time, a low temperature, non-hydrothermal synthesis procedure for hydrosodalites, compatible with extrusion processing, is demonstrated. Kaolinite precursor, without calcination, was activated with a sodium hydroxide solution and formed at a workability consistent with extrusion. The cured samples were characterised using a range of advanced analytical techniques including PXRD, SEM, TGA, 27Al and 29Si-MAS-NMR, and FTIR to confirm and quantify conversion of the precursor to product phases. The synthesis consistently formed a 8:2:2 basic hydroxysodalite phase and the reaction was shown to follow a largely linear relationship with Na:Al until full conversion to the hydrosodalite phase was approached. The hydrosodalite became more ordered for Na:Al ≥ 1. There is good agreement between quantitative measurements made using PXRD, TGA and 29Si-MAS-NMR methods, providing confidence in the results. It has been shown that it is possible to synthesise hydrosodalite materials in a consistent and predictable manner, using non-hydrothermal methods, at the viscosity used for extrusion processing. This novel processing route could reduce production costs, production impacts and open up new applications for this important family of materials.



中文翻译:

一种温和的条件合成路线,可从高岭石生产水苏打石,与挤出工艺兼容

水苏打石是一类沸石材料,具有多种可能的应用,例如水脱盐。典型的合成方法相对复杂,使用水热生产和预处理,因此希望使用较低的能量和更具成本效益的加工路线。首次展示了一种与挤压工艺兼容的,低温合成水合碱的非水热合成方法。未煅烧的高岭石前体用氢氧化钠溶液活化,并以与挤出一致的可加工性形成。使用一系列先进的分析技术(包括PXRD,SEM,TGA,27Al和29Si-MAS-NMR和FTIR)对固化的样品进行表征,以确认和量化前体向产物相的转化。合成始终形成8:2:2的碱性羟基钠钙石相,反应表明与Na:Al具有很大的线性关系,直到达到完全转化为氢钠钙石相为止。对于Na:Al≥1,水苏打变得更有序。使用PXRD,TGA和29Si-MAS-NMR方法进行的定量测量之间有很好的一致性,从而为结果提供了信心。已经表明,可以使用非水热方法以一致和可预测的方式以挤出加工所用的粘度以一致且可预测的方式合成水苏打粉材料。这种新颖的加工路线可以降低生产成本,降低生产影响并为这一重要的材料系列开拓新的应用领域。直到完全转化为水钠钙石相为止。对于Na:Al≥1,水苏打变得更有序。使用PXRD,TGA和29Si-MAS-NMR方法进行的定量测量之间有很好的一致性,从而为结果提供了信心。已经表明,可以使用非水热方法以一致和可预测的方式以挤出加工所用的粘度以一致且可预测的方式合成水苏打粉材料。这种新颖的加工路线可以降低生产成本,降低生产影响并为这一重要的材料系列开拓新的应用领域。直到完全转化为水钠钙石相为止。对于Na:Al≥1,水苏打变得更有序。使用PXRD,TGA和29Si-MAS-NMR方法进行的定量测量之间有很好的一致性,从而为结果提供了信心。已经表明,可以使用非水热方法以一致和可预测的方式以挤出加工所用的粘度以一致且可预测的方式合成水苏打粉材料。这种新颖的加工路线可以降低生产成本,降低生产影响并为这一重要的材料系列开拓新的应用领域。已经表明,可以使用非水热方法以一致和可预测的方式以挤出加工所用的粘度以一致且可预测的方式合成水苏打粉材料。这种新颖的加工路线可以降低生产成本,降低生产影响并为这一重要的材料系列开拓新的应用领域。已经表明,可以使用非水热方法以一致和可预测的方式以挤出加工所用的粘度以一致且可预测的方式合成水苏打粉材料。这种新颖的加工路线可以降低生产成本,降低生产影响并为这一重要的材料系列开拓新的应用领域。

更新日期:2018-01-16
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