| Studies on Natural CXN Zeolite： Modification, Framework De-alumination and Ion-exchange |
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| 引用本文： | 龙英才,夏晓慧,杨波,张玲妹,周伟正,曹智龙,李彩云.Studies on Natural CXN Zeolite： Modification, Framework De-alumination and Ion-exchange[J].中国化学,2004,22(7):668-672. |
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| 作者姓名： | 龙英才 夏晓慧 杨波 张玲妹 周伟正 曹智龙 李彩云 |
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| 作者单位： | [1]ShanghaiKeyLaboratoryofMolecularCatalysisandInnovativeMaterials,DepartmentofChemistry,FudanUniversity,Shanghai200433,China [2]ShanghaiWU-JINGChemicalCorporationLtd.,Shanghai200241,China |
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| 摘 要： | A natural CXN zeolite (stilbite, type code-STI) discovered in China was modified with NH4^ exchange by using ammonium salt and calcinations (procedure Ⅰ), or with NH4 exchange followed by treatment with acid (procedure Ⅱ). The coordination state of Si and A1 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,^29Si and ^27Al MAS NMR, Ag^ ion exchange and Ne 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 high thermal stability.
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| 关 键 词： | H-STI辉沸石 铝酸盐 离子交换 铵根离子 硅原子 铝原子 氮气吸附 结构 修饰 |
Studies on Natural CXN Zeolite: Modification, Framework De-alumination and Ion-exchange |
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| LONG,Ying-Cai,a XIA,Xiao-Huib YANG,BobZHANG,Ling-Meib ZHOU,Wei-ZhengaCAO,Zhi-Longb LI,Cai-Yunb a Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials.Studies on Natural CXN Zeolite: Modification, Framework De-alumination and Ion-exchange[J].Chinese Journal of Chemistry,2004,22(7):668-672. |
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| Authors: | LONG Ying-Cai a XIA Xiao-Huib YANG BobZHANG Ling-Meib ZHOU Wei-ZhengaCAO Zhi-Longb LI Cai-Yunb a Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials |
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| Institution: | LONG,Ying-Cai*,a XIA,Xiao-Huib YANG,BobZHANG,Ling-Meib ZHOU,Wei-ZhengaCAO,Zhi-Longb LI,Cai-Yunb a Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials,Department of Chemistry,Fudan University,Shanghai 200433,China. b Shanghai WU-JING Chemical Corporation Ltd.,Shanghai 200241,China |
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| Abstract: | A natural CXN zeolite (stilbite, type code-STI) discovered in China was modified with +4NH exchange by using ammonium salt and calcinations (procedure I), or with +4NH exchange followed by treatment with acid (procedure II). 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, 29Si and 27Al MAS NMR, Ag+ ion exchange and N2 adsorption. The results of the investigations indicate that different procedure of the modification made variety on the distribution of the framework Si atoms and Al 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 high thermal stability. |
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| Keywords: | STI zeolite modification 29Si and 27Al MAS NMR ion exchange N2 adsorption |
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