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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 15, Number 5
BKCSDE 15(5)
May 20, 1994

Title	A Study of the Structure and Thermal Property of Cu2+ and NH4+ Ion-Exchanged Zeolite A
Author	Jong-Yul Park*, Mi-Sook Kang, Sang-Gu Choi, Yang Kim, Un-Sik Kim
Keywords
Abstract	The frameworks of (Cu(NH3)3OH+)x(NH4+)12-x-A· zH2O which were prepared by the ion-exchange of zeolite A with ammoniac cupric nitrate solution are more stable than those of CuxNa12-2x-A obtained by the ion exchange with aqueous cupric nitrate solution are more stable than those of CuxNa12-2x-A obtained by the ion exchange with aqueous cupric nitrate solution. An energetic calculation was made on the relatively stable (CuOH+)2(NH4+)10-A·zH2O prepared by the partial evacuation of (Cu(NH3)3OH+)2(NH4+)10-A·zH2O. The mean stabilization energies of water, OH-, and NH4+ ions are -30.23 kcal/mol, -60.24 kcal/mol, and -16.65 kcal/mol, respectively. The results of calculation were discussed in terms of framework stability. The (Cu(NH3)3OH+)2(NH4+)10-A·zH2O zeolite shows two step deammoniation reactions. The first deammoniation around 210 ℃ (third DSC peak) was attributed to the decomposition of [Cu(NH3)3OH+] ion and the second one around 380 ℃ (fourth DSC peak) was ascribed to the decomposition of NH4+ ion. The activation energies of the first and second deammoniation reactions were 99.75 kJ/mol and 176.57 kJ/mol, respectively.
Page	341 - 346
Full Text	PDF

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