Nitrogen adsorbent and use thereof
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United States of America Patent
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Jul 23, 2002
Grant Date -
N/A
app pub date -
Jun 14, 2000
filing date -
Jun 24, 1997
priority date (Note) -
Expired
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Abstract
A nitrogen adsorbent comprising a crystalline X zeolite having a faujasite structure with an SiO.sub.2 /Al.sub.2 O.sub.3 ratio of less than 3.0, wherein the crystal contains at least one trivalent element of the group consisting of Fe, B and Ga and (AlO.sub.4).sup.5- tetrahedral units thereof associated with cations. Although the adsorbent contains a designated trivalent element in the zeolite, it maintains the number of cation sites contributing to adsorption, has an excellent separation performance of nitrogen and oxygen, and exhibits excellent heat resistance. Further, when the nitrogen adsorbent of the present invention is used in such a particular manner that it adsorbs nitrogen after being heated under a vacuum, adsorption performance is improved.
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