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Abstract
AbstractA 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, 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 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.
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