MSE-type zeolite production method
The objective of the invention is to provide an MSE-type zeolite production method such that an MSE-type zeolite can be produced in a comparatively short heating time by using inexpensive tetraethylammonium ion. The production method of the present invention comprises steps of: (1) mixing a silica source, an alumina source, an alkali source, tetraethylammonium ion, and water in such a manner as to yield a reaction mixture of the composition represented by the molar ratios indicated below: SiO 2 /Al 2 O 3 =between 10 and 100 inclusive (Na 2 O+K 2 O)/SiO 2 =between 0.15 and 0.50 inclusive K 2 O/(Na 2 O+K 2 O)=between 0.05 and 0.7 inclusive TEA 2 O/SiO 2 =between 0.08 and 0.20 inclusive H 2 O/SiO 2 =between 5 and 50 inclusive; (2) using the MSE-type zeolite as a seed crystal, and adding this seed crystal to the mixture at a proportion of 5 to 30% by mass with respect to the silica component in the reaction mixture; and (3) heating, under hermetic seal at a temperature of 100 to 200° C., the reaction mixture whereto the seed crystal has been added.
1. A method for producing an MSE-type zeolite comprising the steps of:
(1) mixing a silica source, an alumina source, an alkali source, tetraethylammonium ions and water so as to obtain a reaction mixture having a composition represented by molar ratios indicated below:
SiO 2 /Al 2 O 3 =10 or more and 100 or less,
(Na 2 O+K 2 O)/SiO 2 =0.15 or more and 0.50 or less,
K 2 O/(Na 2 O+K 2 O)=0.05 or more and 0.7 or less,
TEA 2 O/SiO 2 =0.08 or more and 0.20 or less and
H 2 O/SiO 2 =5 or more and 50 or less
(in the formula, TEA represents tetraethylammonium ion);
(2) using an MSE-type zeolite as a seed crystal and adding this to the reaction mixture at a ratio of 5% by mass or more and 30% by mass or less with respect to the silica component in the reaction mixture; and
(3) heating the reaction mixture to which the seed crystal has been added, at a temperature of not less than 100° C. and less than 200° C. in a hermetically sealed manner.
2. The method for producing an MSE-type zeolite according to claim 1 , wherein the reaction mixture containing no seed crystal is preheated at a temperature of not less than 50° C. and not more than 100° C. in a hermetically sealed manner, followed by adding a seed crystal to the reaction mixture and heating the reaction mixture at a temperature of not less than 100° C. and less than 200° C. in a hermetically sealed manner.
3. The method for producing an MSE-type zeolite according to claim 1 , wherein the seed crystal is an MSE-type zeolite produced by the steps (1) to (3).
4. The method for producing an MSE-type zeolite according to claim 1 , wherein the seed crystal is an MSE-type zeolite obtained in a step other than the steps (1) to (3).
5. The method for producing an MSE-type zeolite according to claim 1 , wherein the reaction mixture is stirred in the step of heating in a hermetically sealed manner.