Preformed zeolite precursor route for synthesis of mesoporous X zeolite

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• 作者：Shuzhen Liu ; Xuejing Cao ; Liansheng Li ; Caijin Li ; Yanyan Ji ; Feng-Shou Xiao
• 关键词：Mesoporous ; NaX zeolite ; Cationic polymer ; Spirulina ; Calcium ion-exchange
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2008
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：1 April 2008
• 卷：318
• 期：1-3
• 页码：269-274
• 文件大小：883 K

摘要

Mesoporous NaX zeolites (Meso-NaXs) have been successfully synthesized by a combination of preformed FAU (Faujasite) zeolite precursors and organic templates of cationic polymer (polydiallyldimethylammonium chloride, PDADMAC) and spirulina (SP). Characterization of Meso-NaXs by scanning electron micrographs (SEMs) indicates the existence of mesopores with sizes of 4–50 nm. Furthermore, nitrogen adsorption–desorption isotherms of Meso-NaXs exhibit not only adsorption at low relative pressure (P/P₀ < 0.02) but also hysteresis loops at high relative pressure (P/P₀ = 0.4–1.0). Additionally, the calcium ion-exchange rate of these mesoporous NaX zeolites is higher than that of conventional NaX zeolite, which would be very helpful for industrial application of NaX zeolite as a highly effective adsorbent and ion-exchanger.