Patent ID: 8673057
Filing Date: 2014-03-18
Classification: B01D,B82Y,C01B,C01P

Abstract:
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.