イオン交換したゼオライトの示差熱分析と窒素ガス吸着

概要

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Using the synthesized Na-X zeolite as the starting substance, ion exchange was carried out with NH_4^+, Li^+, K^+, Mg^<2+>, Ca^<2+>, Sr^<2+>, Ba^<2+>, Co^<2+>, Ni^<2+>, and Cu^<2+> by the Batch method. Copper exchanger was not formed and Antlerite (3CuO・SO_3・2H_2O), a basic copper sulfate, formed instead. Differential thermal analysis of ion-exchanged zeolite was carried out and it was found that the transition temperature became higher in the order of Co, Mg, Ba, Na, NH_4,Ca, and Sr. Dehydration peak of the water of crystallization was found at 190-230°. Nitrogen gas adsorption indicated the change in internal surface area of zeolite obtained by ion exchange, and a correlation was found between the water content and ionic radius. External surface area of ion exchanged zeolite is thought to remain almost unchanged by ion exchange but that of zeolite with poor ion exchange rate is large and such samples was presumed to undergo partial decomposition of the crystal structure during ion exchange. Quantity of adsorption on the external surface of zeolite with good exchange rate was 8-15 ml/g.
社団法人日本薬学会の論文
1968-12-25