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Indexed by:期刊论文

Date of Publication:2009-06-10

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:478

Issue:1-2

Page Number:L5-L7

ISSN No.:0925-8388

Key Words:Inorganic materials; Chemical synthesis; Liquid-solid reactions; X-ray diffraction

Abstract:The magnesium (II)-exchanged zeolite A (MgA) was prepared by cation exchange process using sodium form zeolite A (NaA) and MgCl2 in aqueous solution. The prepared MgA was characterized by infrared spectroscopy and X-ray powder diffraction analysis. The results showed that the LTA structure remains after cation exchange. A static volumetric system was employed to evaluate the N-2 and O-2 adsorption properties of all the samples at 298 K. It was found that the N-2 adsorption capacity of MgA increased rapidly with pressure rise, and the adsorption isotherm of N-2 became nonlinear in low pressure region. The O-2 adsorption capacity of MgA increased slightly with pressure. The introducing Mg2+ into the sodium type zeolite A greatly enhanced the N-2 adsorption capacity. The highest N-2 adsorption capacity and N-2/O-2 selectivity appeared in the sample with 64.3% of Mg2+ replaced. (C) 2008 Elsevier B.V. All rights reserved.