Zeolite DDR membranes
First Claim
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1. A method for preparing DDR membranes on porous substrates, said method comprising the steps of:
- a) preparing seed DDR zeolite crystals in a first growth solution comprising about 6 ADA;
100 SiO2;
50 KF;
8000 H2O, said seed DDR zeolite crystals having a uniform crystal structure and size;
b) seeding a porous substrate with said seed DDR zeolite crystals of 200-600 nm;
c) growing a DDR zeolite membrane by incubation in a second growth solution selected from the group consisting of about 6 ADA;
100 SiO2 50 KF;
10000 H2O, about 6 ADA;
100 SiO2;
x KF;
4000 H2O, where x=60-100 and about 9 ADA;
100 SiO2;
80 KF;
4000 H2O;
d) optionally calcining said DDR zeolite membrane; and
e) optionally sealing any defects in said DDR zeolite membrane by incubation with using a polydimethlysiloxane (PDMS) solution under a pressure differential.
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Abstract
DDR nanocrystals of uniform size and structure were synthesized using hydrothermal secondary growth and then used to make DDR zeolite membranes and for any other use where uniform, small DDR zeolite crystals are beneficial.
39 Citations
19 Claims
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1. A method for preparing DDR membranes on porous substrates, said method comprising the steps of:
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a) preparing seed DDR zeolite crystals in a first growth solution comprising about 6 ADA;
100 SiO2;
50 KF;
8000 H2O, said seed DDR zeolite crystals having a uniform crystal structure and size;b) seeding a porous substrate with said seed DDR zeolite crystals of 200-600 nm; c) growing a DDR zeolite membrane by incubation in a second growth solution selected from the group consisting of about 6 ADA;
100 SiO2 50 KF;
10000 H2O, about 6 ADA;
100 SiO2;
x KF;
4000 H2O, where x=60-100 and about 9 ADA;
100 SiO2;
80 KF;
4000 H2O;d) optionally calcining said DDR zeolite membrane; and e) optionally sealing any defects in said DDR zeolite membrane by incubation with using a polydimethlysiloxane (PDMS) solution under a pressure differential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification