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XE-N CLUSTERS IN THE ALPHA CAGES OF ZEOLITE KA

机译:分子筛KA的XE-N簇

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We have observed the individual signals of the Xe-n clusters (n=1-5) trapped in the alpha cages of zeolite KA. The Xe-129 NMR chemical shift of each cluster in zeolite KA is larger than that of the corresponding Xe-n cluster in zeolite NaA. The temperature dependence of the chemical shifts of the clusters vary systematically with cluster size as they do in NaA, but the change of the temperature coefficients with n is somewhat more pronounced for Xe-n in the cages of KA than in NaA. The Xe-n chemical shifts and their variation with temperature are reproduced by the grand canonical Monte Carlo (GCMC) simulations. GCMC simulations of the distribution of the Xe atoms among the alpha cages in KA provide the fractions of cages containing n Xe atoms which agree reasonably well with the observed equilibrium distribution. The characteristics of Xe distribution and chemical shifts in KA are compared with that in NaA. (C) 1995 American Institute of Physics. [References: 56]
机译:我们已经观察到被困在沸石KA的α笼中的Xe-n团簇(n = 1-5)的各个信号。沸石KA中每个簇的Xe-129 NMR化学位移大于沸石NaA中相应的Xe-n簇的Xe-129 NMR化学位移。簇的化学位移对温度的依赖性与簇的大小在NaA中一样,随簇的大小而系统地变化,但是在KA的笼子中,Xe-n的温度系数随n的变化比在NaA中更为明显。 Xe-n化学位移及其随温度的变化通过经典的蒙特卡洛(GCMC)模拟得以再现。在KA中,α笼中Xe原子的分布的GCMC模拟提供了包含n个Xe原子的笼的分数,这些分数与观察到的平衡分布相当吻合。将KA中Xe分布和化学位移的特征与NaA中的特征进行了比较。 (C)1995年美国物理研究所。 [参考:56]

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