Studies on natural CXN zeolite: Modification, framework De-alumination and ion-exchange
✍ Scribed by Ying-Cai Long; Xiao-Hui Xia; Bo Yang; Ling-Mei Zhang; Wei-Zheng Zhou; Zhi-Long Cao; Cai-Yun Li
- Book ID
- 102101295
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 447 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0256-7660
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✦ Synopsis
Abstract
A natural CXN zeolite (stilbite, type code‐STI) discovered in China was modified with NH: exchange by using ammonium salt and calcinations (procedure I), or with NH: exchange followed by treatment with acid (procedure rr). The coordination state of Si and Al atoms in the framework. the property of ion exchange, and the adsorption of the H‐STI zeolite samples prepared by different modification procedure were investigated with XRD, EDX, ^29^Si and ^27^Al MAS NMR, Ag^+^ ion exchange and N~2~ adsorption. The results of the investigations indicate that different procedure of the modification made variety on the distribution of the framework Si atoms and A1 atoms, the content of non‐framework aluminum. and the blocking channels and the shielding effect to the positions of the exchangeable cations. The H‐STI zeolite prepared by the procedure II possesses high ion exchange capacity, open and perfect pore system, and hgh thermal stability.