Inhomogeneous distribution of water adsorbed under low pressure in CrAPO-5 and SAPO-5: An interference microscopy study
Inhomogeneous distribution of water adsorbed under low pressure in CrAPO-5 and SAPO-5: An interference microscopy study
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CrAPO-5 和 SAPO-5 中低压吸附水的不均匀分布：干涉显微镜研究
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
F. Schüth
中科院分区：
文献类型：
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作者：
E. Lehmann;S. Vasenkov;J. Kärger;Gabriela Zadrożna;J. Kornatowski;Ö. Weiss;F. Schüth
晶内浓度分布的水，吸附在大晶体的CrAPO-5和SAPO-5下与水蒸气在1和20毫巴的平衡，用干涉显微镜测定。在较低的压力下，档案揭示了两种晶体类型的晶内水的高度不均匀分布。这种效应归因于晶体的结构异质性。它可能与晶体生长过程的进展被认为是。在20毫巴的蒸汽压下，水分子均匀地分布在晶体上。在这种情况下，孔隙体积被类似液体的水饱和。已发现结构异质性对晶体的最终摄取水平具有低影响或没有影响。
Intracrystalline concentration profiles of water, adsorbed in large crystals of CrAPO-5 and SAPO-5 under equilibrium with water vapor at 1 and 20 mbar, were determined with use of interference microscopy. At lower pressure, the profiles reveal highly inhomogeneous distributions of intracrystalline water in both crystal types. This effect is attributed to structural heterogeneity of the crystals. Its possible relation to the progress of the crystal growth process is considered. Under the vapor pressure of 20 mbar, the water molecules are homogeneously distributed over the crystals. In this case, the pore volume is saturated with liquid-like water. The structural heterogeneity has been found to have a low or no influence on the final uptake level of the crystals.