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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >Hydrothermal stability of NaBH4 enclathrated sodalites with aluminosilicate and gallosilicate framework
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Hydrothermal stability of NaBH4 enclathrated sodalites with aluminosilicate and gallosilicate framework

机译：铝硅酸盐和镓硅酸盐骨架的NaBH4包封方钠石的水热稳定性

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摘要

The time dependent stability of tetrahydroborate sodalites with aluminosilicate- and gallosilicate framework was studied in water at room temperature and under hydrothermal conditions at 353 K. The experiments were carried out in different time intervals (4-48 h) using an excess of water according a solid: liquid mass ratio of 1:150. The kinetics of decomposition was followed by registration of weight loss, change of the pH-value and by X-ray powder diffraction as well as FT-IR spectroscopy.Both samples undergo remarkable time dependent decomposition. The decomposition rate is higher for the gallosilicate sodalite even though its crystal size is larger compare to the aluminosilicate sodalite. Besides formation of some X-ray amorphous material in both cases precipitation of crystalline aluminosilicate or gallosilicate was found, always connected with impurities of carbonate anions.FT-IR clearly showed that the remaining parts of sodalite structure of both samples were always pure tetrahydroborate sodalite. No borate species other than BH4" were detected. Thus, hydrolysis of the moisture sensitive BH_4~- anions by an entrance of water into intact cages can be excluded under the described experimental conditions.
机译：在室温和水热条件下于353 K下于水中研究了具有硅铝酸盐和镓硅酸盐骨架的四氢硼酸盐方钠石的时间依赖性稳定性。在不同的时间间隔（4-48小时）中使用过量的水按照固体：液体的质量比为1：150。分解的动力学过程是记录失重，pH值的变化，X射线粉末衍射以及FT-IR光谱。这两个样品都经历了明显的时间依赖性分解。镓铝硅酸盐方钠石的分解率较高，即使其晶体尺寸比铝硅酸盐方钠石大。在这两种情况下，除了形成一些X射线无定形物质外，还发现结晶铝硅酸盐或镓硅酸盐的沉淀，总是与碳酸根阴离子杂质相连.FT-IR清楚地表明，两个样品的方钠石结构的其余部分始终是纯四氢硼酸盐方钠石。没有检测到除“ BH4”以外的硼酸盐物种。因此，在所述的实验条件下，可以排除对水敏感的BH_4-阴离子由于水进入完整的笼子而发生的水解。

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