Method for producing PAU zeolite
View Patent ↗Provided is a method that is for producing a PAU zeolite and that can have an environmental impact that is reduced while, as much as possible, not using a structure-defining agent. The method for producing a PAU zeolite produces by means of (1) mixing a silica source, an alumina source, an alkali source, and water in a manner so as to result in a reaction mixture having a composition represented by a specific mole ratio, (2) using as the seed crystal a PAU zeolite that does not contain organic compounds and has a SiO 2 /Al 2 O 3 ratio of 4-15 and an average particle size of at least 100 nm, and adding same to the reaction mixture at a ratio of 0.1-20 wt % with respect to the silica component in the reaction mixture, and (3) subjecting the reaction mixture to which the seed crystal has been added to sealed-vessel heating at 80-200° C.
1. A method for producing a PAU zeolite comprising:
(1) mixing a silica source, an alumina source, an alkali source, and water so as to be a reaction mixture having a composition represented by a molar ratio given below;
SiO 2 /Al 2 O 3 =8 to 24
K 2 O/SiO 2 =0.3 to 0.7
H 2 O/SiO 2 =5 to 50
(2) using an organic compound-free PAU zeolite, in which the SiO 2 /Al 2 O 3 ratio ranges from 4 to 15 and a mean particle size is equal to or more than 100 nm, as a seed crystal, and adding the organic compound-free PAU zeolite to the reaction mixture at a rate of 0.1 to 20% by weight with respect to a silica component in the reaction mixture; and
(3) airtightly heating the reaction mixture to which the seed crystal is added at 80 to 200° C.
2. The method according to claim 1 , wherein
the reaction mixture is agitated in the airtightly heating process.
3. The method according to claim 1 , further comprising
aging the reaction mixture under a temperature of 20 to 100° C. prior to heating the reaction mixture.
4. The method according to claim 3 , wherein
the reaction mixture is agitated in the airtightly heating process.
5. The method according to claim 1 , further comprising:
(1) mixing a silica source, an alumina source, an alkali source, and water so as to be a reaction mixture having a composition represented by a molar ratio given below;
SiO 2 /Al 2 O 3 =8 to 20
K 2 O/SiO 2 =0.35 to 0.65
H 2 O/SiO 2 =10 to 30
(2) using an organic compound-free PAU zeolite, in which the SiO 2 /Al 2 O 3 ratio ranges from 4 to 15 and a mean particle size is equal to or more than 100 nm, as a seed crystal, and adding the organic compound-free PAU zeolite to the reaction mixture at a rate of 0.1 to 20% by weight with respect to a silica component in the reaction mixture; and
(3) airtightly heating the reaction mixture to which the seed crystal is added at 100 to 150° C.
6. The method according to claim 5 , further comprising
aging the reaction mixture under a temperature of 20 to 100° C. prior to heating the reaction mixture.
7. The method according to claim 5 , wherein
the reaction mixture is agitated in the airtightly heating process.