Patent ID: 6423121
Filing Date: 2002-07-23
Classification: B01D,B01J,Y10S

Abstract:
A method for adsorbing nitrogen from a nitrogen-containing material with a nitrogen adsorbent, the method comprising heating the nitrogen adsorbent under a vacuum for developing a strong interaction between at least one trivalent element and a zeolite framework, heating the nitrogen adsorbent to remove adsorbed water, and contacting the nitrogen containing material with the nitrogen adsorbent, the nitrogen adsorbent comprising a crystalline X zeolite having a faujasite structure with an SiO2/Al2O3 ratio of less than 3.0, the crystal in which a part of the framework is replaced by the at least one trivalent element selected from the group consisting of Fe, B and Ga and (AlO4)5âˆ’ tetrahedral units containing the at least one trivalent element associated with cations.