| 主权项 |
1. A method of preparing a CHA-type molecular sieve having a mole ratio of at least 10 of (1) at least one oxide of at least one tetravalent element to (2) one or more oxides selected from the group of consisting of oxides of trivalent elements, pentavalent elements, and mixtures thereof, the method comprising:
(a) forming an aqueous reaction mixture comprising a composition, in terms of mole ratios, as follows:YO2/W2On≧10M/YO20.05 to 1.0OH/YO2 0.1 to 1.0Q/YO20.02 to 0.2A/YO20.02 to 0.2H2O/YO2 5 to 70 wherein:
(1) Y is selected from the group consisting of tetravalent elements from Groups 4-14 of the Periodic Table, and mixtures thereof;(2) W is selected from the group consisting of trivalent and pentavalent elements from Groups 3-13 of the Periodic Table, and mixtures thereof;(3) n equals the valence state of W;(4) M is selected from the group consisting of elements from Groups 1 and 2 of the Periodic Table;(5) Q is a N,N,N-trimethyl-1-adamantammonium cation; and(6) A is a N,N-dimethyl-3,5-dimethylpiperidinium cation; and (b) maintaining the reaction mixture under crystallization conditions sufficient to form crystals of the molecular sieve. |
