Laminated zeolite composite and method for production thereof
AssigneeNGK Insulators, Ltd.
InventorsNobuhiko Mori, Toshihiro Tomita, Hitoshi Sakai
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Abstract
A laminated zeolite composite is provided, including a MFI membrane constituted by a MFI type zeolite having a SiO2/Al2O3 (molar ratio) of 40 to 100, and a porous substrate constituted by a MFI type zeolite having a SiO2/Al2O3 (molar ratio) of 20 to 400, wherein the MFI membrane is formed on the porous substrate. The composite has high separation characteristics and high permeability.
Claims2
A method for producing a laminated zeolite composite comprising immersing a porous substrate in a silica sol-containing sol for membrane formation and forming a MFI membrane on the porous substrate under heating conditions;
- said method being characterized in that a porous substrate being constituted by a MFI type zeolite and having a SiO2/Al2O3 (molar ratio) of 20 to 400 is immersed in a sol for membrane formation having a SiO2/Al2O3 (molar ratio) of 40 to 150 and a Na2O/Al2O3 (molar ratio) of 15 or less.
Dependencies are inferred from the claim text.