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论文类型：期刊论文

发表时间：2009-06-10

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

收录刊物：SCIE、EI、Scopus

卷号：478

期号：1-2

页面范围：L5-L7

ISSN号：0925-8388

关键字：Inorganic materials; Chemical synthesis; Liquid-solid reactions; X-ray diffraction

摘要：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.