Method for producing MTW-type zeolite
View Patent ↗The method for producing an MTW-type zeolite according to the present invention includes: mixing a silica source, an alumina source, an alkali source, a lithium source, and water so as to obtain a reaction mixture having a composition represented by specific molar ratios; (2) adding an MTW-type zeolite which has a SiO 2 /Al 2 O 3 ratio of 10 to 500 and does not contain an organic compound, as a seed crystal, to the reaction mixture in a proportion of 0.1 to 20% by weight relative to the silica component in the reaction mixture; and (3) airtightly heating the reaction mixture, to which the seed crystal has been added, at 100 to 200° C.
1. A method for producing an MTW-type zeolite, comprising:
(1) mixing an alumina source, an alkali source, a lithium source, and water so as to obtain a reaction mixture;
(2) adding a seed crystal of a Beta-type zeolite before adding a silica source or adding the seed crystal of the Beta-type zeolite while being mixed with a silica source, to the reaction mixture in a proportion of 0.1 to 20% by weight relative to the silica component in the reaction mixture, mixing and stirring,
wherein the Beta-type zeolite of the seed crystal has a SiO 2 /Al 2 O 3 ratio of 10 to 500 and does not contain an organic compound; and
wherein the resulting reaction mixture has a composition represented by the following molar ratios:
SiO 2 /Al 2 O 3 =12 to 200
Na 2 O/SiO 2 =0.1 to 0.3
Li 2 O/(Na 2 O+Li 2 O)=0.05 to 0.5
H 2 O/SiO 2 =10 to 50;
and
(3) air tightly heating the reaction mixture, to which the seed crystal of the Beta-type zeolite has been added, at 100 to 200° C.