| 摘要 |
A synthetic mordenite molded body is prepared by a process wherein a starting mixture comprising, as the main components, a silica source, an alumina source, an alkali source and water is molded into a starting molded body, the molded body is calcined and the calcined molded body is heated in an aqueous solution of sodium silicate. The starting mixture has incorporated therein a mordenite seed crystal powder. When the molded body is calcined, the temperature is elevated by heating to a calcination temperature not lower than 400 DEG C. at an average rate of at least 10 DEG C./min and calcination is conducted at the calcination temperature within a time period of 2 hours. When the calcined molded body is crystallized, an aqueous solution of sodium silicate having an SiO2 concentration of 7 to 25% by weight, an Na2O concentration of 2 to 8% by weight and an SiO2/Na2O molar ratio of from 0.9 to 4.0 is used as the aqueous solution of sodium silicate. |
