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Nanocrystalline zeolites in supercritical water. Part B: Challenges of synthesis in organotemplate-free condition
The Journal of Supercritical Fluids ( IF 3.4 ) Pub Date : 2019-10-15 , DOI: 10.1016/j.supflu.2019.104650
Morteza Hosseinpour , Amir Charkhi , Hamed Nourian Ahari , Seyed Javad Ahmadi

In the second part, fast synthesis of nanocrystalline zeolites in supercritical water (SCW) condition is studied in the absence of hazardous organic templates with a main product of analcime. The reason is attributed to the reduction in ion dissociation in SCW. In order to reach higher ion dissociation and therefore increase the chance to obtain other type of zeolites, first the alkalinity atmosphere of precursor batch composition changed from sodium hydroxide to potassium hydroxide in SCW followed by adding a long-chain alcohol (namely 2-decanol) in order to add the concentration of OH in synthesis system. The addition of 2-decanol shows a noteworthy modification in the size and size distribution of nanocrystals as well as product yield. This method is green and promising for the rapid synthesis of zeolitic nanoparticles in uniform size with a high degree of purity and crystallinity as well.



中文翻译:

超临界水中的纳米晶沸石。B部分:无有机模板条件下的合成挑战

在第二部分中,研究了在超临界水(SCW)条件下快速合成纳米晶沸石的情况,该工艺不存在以主要成分为Analcime的危险有机模板。原因归因于SCW中离子离解的减少。为了达到更高的离子解离度并因此增加获得其他类型沸石的机会,首先在SCW中将前体批料组合物的碱度气氛从氢氧化钠变为氢氧化钾,然后添加长链醇(即2-癸醇)为了添加OH的浓度-在合成系统中。2-癸醇的添加在纳米晶体的尺寸和尺寸分布以及产物产率方面显示出显着的改变。该方法是绿色的,并且有望用于以均一的尺寸快速合成具有高纯度和结晶度的沸石纳米颗粒。

更新日期:2019-10-15
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