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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >High-pressure behavior of HEU-type zeolites: X-ray diffraction study of clinoptilolite-Na
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High-pressure behavior of HEU-type zeolites: X-ray diffraction study of clinoptilolite-Na

机译：HEU型沸石的高压行为：斜发沸石-Na的X射线衍射研究

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Clinoptilolite-Na, Na2.55Ca1.67K0.37(H2O)(21.5)[Al6.21Si29.79O72], with the space group C2/m, a = 17.6229(4), b = 17.9957(3), c = 739625(15) angstrom, beta = 116.353(3), V = 2101.85(7) angstrom(3), and Z = 1 has been studied by single -crystal X-ray diffraction method in normal conditions as well as under compression in penetrating (water-containing) and non-penetrating (paraffin) media. When compressing in water medium, clinoptilolite is subjected to the additional hydration at the starting stage unlike the structurally similar heulandite with persistent increasing the content of H2O over the wide pressure range. This occurs owing to the additional population of partially vacant positions. With further increasing the pressure, H2O molecules are redistributed in the extraframework subsystem saving the total number. Both literature and our data on compression of zeolites of the isomorphous heulandite-clinoptilolite series in non penetrating media evidence that the compressibility along the coordinate directions noticeably differs from sample to sample including differences in the direction of the largest compression. This is evidently associated with variations in the zeolite composition. (C) 2016 Elsevier Inc. All rights reserved.
机译：斜发沸石-Na，Na2.55Ca1.67K0.37（H2O）（21.5）[Al6.21Si29.79O72]，空间组C2 / m，a = 17.6229（4），b = 17.9957（3），c = 739625 （15）埃，β= 116.353（3），V = 2101.85（7）埃（3），Z = 1已通过单晶X射线衍射法在正常条件下以及在压缩条件下进行了渗透研究（水性）和非渗透性（石蜡）介质。当在水介质中压缩时，斜发沸石在开始阶段要进行额外的水合作用，这与结构相似的赤铁矿不同，在宽压力范围内持续增加H2O的含量。这是由于额外增加了部分空缺职位。随着压力的进一步增加，H2O分子将重新分配到框架外子系统中，从而节省了总数。文献和我们在非渗透性介质中的同晶型堇青石-斜发沸石系列沸石的压缩数据均表明，沿样品方向的可压缩性在不同样品之间明显不同，包括最大压缩方向上的差异。显然这与沸石组成的变化有关。 （C）2016 Elsevier Inc.保留所有权利。

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