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Applied Catalysis A: General, Volume 304, 10 May 2006, Pages 49-54 Ten grams of NH4Y zeolite was put into aqueous solutions of Fe(NO3)3¡¤9H2O, Co(NO3)2¡¤6H2O, Ni(NO3)2¡¤6H2O, Cr(NO3)3¡¤7H2O and Zr(NO3)4¡¤3H2O. For each solution, the ion-exchange process was carried out at 90 ¡ãC under reflux for 4 h; then the solid was filtered, washed, dried at 120 ¡ãC for overnight and finally it was calcined at 500 ¡ãC for 5 h. Atom adsorption spectroscopy (AAS) analysis indicated that metal contents in modified zeolite were about 1.82¨C1.97 wt.%. |
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