| 摘要 |
A synthetic faujasite molded body having high purity and high crystallinity is prepared with a good reproducibility by a process wherein a structure-inducing substance is incorporated in a starting material mixture comprising as main components a silica source, an alumina source, an alkali source and water; the mixture is kneaded and molded into a desired shape; and the molded body is heated in an aqueous solution of an alkali metal silicate or hydroxide. The structure-inducing material has a composition defined by the following oxide molar ratios: SiO2/Al2O2=14 to 60, M2O/Al2O3=15 to 40 and H2O/M2O=12 to 40 (M=alkali metal), and is prepared by mixing together an aqueous alkali metal silicate solution, an aqueous alkali metal aluminate solution and an aqueous alkali metal hydroxide solution to prepare a liquid phase substance having a composition defined by the following oxide molar ratios: SiO2/Al2O3=8 to 14, M2O/Al2O3=7 to 30, and H2O/M2O=10 to 14, aging the liquid phase substance at 20 DEG to 60 DEG C. for 10 minutes to 6 hours; and incorporating an aqueous alkali metal silicate solution into the aged liquid phase substance. |
