The selective adsorption of tellurium in the aluminosilicate regions of AFI- and MOR-type microporous crystals

Tetsuya Kodaira; Takuji Ikeda

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The selective adsorption of tellurium in the aluminosilicate regions of AFI- and MOR-type microporous crystals

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Attempts have been made to load tellurium (Te) atoms into the one-dimensional nano-channels of microporous crystals of aluminophosphate AlPO_4-5 and of aluminosilicate mordenites of the Na~+ form (Na-MOR) and the H~+-form (H-MOR) at 673 K. The density of the atoms adsorbed was in the sequence 0 ~ AlPO_4-5 << H-MOR < Na-MOR. AlPO_4-5 provides a shallow potential of periodical charge fluctuation for Te atoms, from the alternate ordering of Al and P atoms through O atoms. Mordenite offers a sufficiently strong potential for Te adsorption, but the magnitude varies with the type of cation. Dipoles between framework AlO_2~? anion sites and their Na~+ counter-ions in Na-MOR provide a stronger potential than the Br?nsted acid points in H-MOR. The adsorption of Te atoms in the silico-aluminophosphate SAPO-5 was between that of AlPO_4-5 and H-MOR, leading us to suspect that Te atoms are selectively adsorbed in the aluminosilicate regions accompanying the Br?nsted acid points distributed in the major aluminophosphate network. The aluminosilicate regions in SAPO-5 are below 500 nm in size and are distributed throughout a single crystal.

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来源
《Dalton transactions: An international journal of inorganic chemistry》 |2014年第37期|13979-13987|共9页
作者
Tetsuya Kodaira; Takuji Ikeda;
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作者单位

National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.;

National Institute of Advanced Industrial Science and Technology, 4-2-1 Nigatake, Miyagino-ku, Sendai, Miyagi 983-8551, Japan;

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原文格式 PDF
正文语种英语
中图分类化学;无机化学;
关键词
adsorption; regions; microporous;

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The selective adsorption of tellurium in the aluminosilicate regions of AFI- and MOR-type microporous crystals

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